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perf_counter: add sample user-space to Documentation/perf_counter/
Initial version of kerneltop.c and perfstat.c. Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
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3 changed files with 1489 additions and 0 deletions
12
Documentation/perf_counter/Makefile
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12
Documentation/perf_counter/Makefile
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@ -0,0 +1,12 @@
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BINS = kerneltop perfstat
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all: $(BINS)
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kerneltop: kerneltop.c perfcounters.h
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cc -O6 -Wall -lrt `pkg-config --cflags --libs glib-2.0` -o $@ $<
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perfstat: kerneltop
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ln -sf kerneltop perfstat
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clean:
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rm $(BINS)
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956
Documentation/perf_counter/kerneltop.c
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956
Documentation/perf_counter/kerneltop.c
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@ -0,0 +1,956 @@
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/*
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* kerneltop.c: show top kernel functions - performance counters showcase
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Build with:
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cc -O6 -Wall `pkg-config --cflags --libs glib-2.0` -o kerneltop kerneltop.c
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Sample output:
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------------------------------------------------------------------------------
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KernelTop: 2669 irqs/sec [NMI, cache-misses/cache-refs], (all, cpu: 2)
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------------------------------------------------------------------------------
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weight RIP kernel function
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______ ________________ _______________
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35.20 - ffffffff804ce74b : skb_copy_and_csum_dev
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33.00 - ffffffff804cb740 : sock_alloc_send_skb
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31.26 - ffffffff804ce808 : skb_push
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22.43 - ffffffff80510004 : tcp_established_options
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19.00 - ffffffff8027d250 : find_get_page
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15.76 - ffffffff804e4fc9 : eth_type_trans
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15.20 - ffffffff804d8baa : dst_release
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14.86 - ffffffff804cf5d8 : skb_release_head_state
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14.00 - ffffffff802217d5 : read_hpet
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12.00 - ffffffff804ffb7f : __ip_local_out
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11.97 - ffffffff804fc0c8 : ip_local_deliver_finish
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8.54 - ffffffff805001a3 : ip_queue_xmit
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Started by Ingo Molnar <mingo@redhat.com>
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Improvements and fixes by:
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Arjan van de Ven <arjan@linux.intel.com>
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Yanmin Zhang <yanmin.zhang@intel.com>
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Mike Galbraith <efault@gmx.de>
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Released under the GPL v2. (and only v2, not any later version)
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*/
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <ctype.h>
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#include <time.h>
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#include <glib.h>
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#include <sys/syscall.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <sys/prctl.h>
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#include <sys/wait.h>
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#include <sys/uio.h>
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#include <linux/unistd.h>
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#ifdef __x86_64__
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# define __NR_perf_counter_open 295
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#endif
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#ifdef __i386__
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# define __NR_perf_counter_open 333
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#endif
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/*
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* Pick up some kernel type conventions:
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*/
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#define __user
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#define asmlinkage
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typedef unsigned int __u32;
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typedef unsigned long long __u64;
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typedef long long __s64;
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/*
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* User-space ABI bits:
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*/
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/*
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* Generalized performance counter event types, used by the hw_event.type
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* parameter of the sys_perf_counter_open() syscall:
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*/
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enum hw_event_types {
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/*
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* Common hardware events, generalized by the kernel:
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*/
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PERF_COUNT_CPU_CYCLES = 0,
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PERF_COUNT_INSTRUCTIONS = 1,
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PERF_COUNT_CACHE_REFERENCES = 2,
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PERF_COUNT_CACHE_MISSES = 3,
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PERF_COUNT_BRANCH_INSTRUCTIONS = 4,
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PERF_COUNT_BRANCH_MISSES = 5,
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PERF_COUNT_BUS_CYCLES = 6,
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PERF_HW_EVENTS_MAX = 7,
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/*
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* Special "software" counters provided by the kernel, even if
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* the hardware does not support performance counters. These
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* counters measure various physical and sw events of the
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* kernel (and allow the profiling of them as well):
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*/
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PERF_COUNT_CPU_CLOCK = -1,
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PERF_COUNT_TASK_CLOCK = -2,
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PERF_COUNT_PAGE_FAULTS = -3,
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PERF_COUNT_CONTEXT_SWITCHES = -4,
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PERF_COUNT_CPU_MIGRATIONS = -5,
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PERF_SW_EVENTS_MIN = -6,
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};
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/*
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* IRQ-notification data record type:
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*/
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enum perf_counter_record_type {
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PERF_RECORD_SIMPLE = 0,
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PERF_RECORD_IRQ = 1,
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PERF_RECORD_GROUP = 2,
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};
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/*
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* Hardware event to monitor via a performance monitoring counter:
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*/
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struct perf_counter_hw_event {
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__s64 type;
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__u64 irq_period;
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__u64 record_type;
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__u64 read_format;
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__u64 disabled : 1, /* off by default */
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nmi : 1, /* NMI sampling */
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raw : 1, /* raw event type */
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inherit : 1, /* children inherit it */
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pinned : 1, /* must always be on PMU */
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exclusive : 1, /* only group on PMU */
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exclude_user : 1, /* don't count user */
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exclude_kernel : 1, /* ditto kernel */
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exclude_hv : 1, /* ditto hypervisor */
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exclude_idle : 1, /* don't count when idle */
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__reserved_1 : 54;
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__u32 extra_config_len;
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__u32 __reserved_4;
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__u64 __reserved_2;
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__u64 __reserved_3;
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};
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/*
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* Ioctls that can be done on a perf counter fd:
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*/
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#define PERF_COUNTER_IOC_ENABLE _IO('$', 0)
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#define PERF_COUNTER_IOC_DISABLE _IO('$', 1)
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asmlinkage int sys_perf_counter_open(
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struct perf_counter_hw_event *hw_event_uptr __user,
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pid_t pid,
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int cpu,
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int group_fd,
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unsigned long flags)
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{
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int ret;
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ret = syscall(
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__NR_perf_counter_open, hw_event_uptr, pid, cpu, group_fd, flags);
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#if defined(__x86_64__) || defined(__i386__)
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if (ret < 0 && ret > -4096) {
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errno = -ret;
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ret = -1;
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}
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#endif
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return ret;
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}
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const char *event_types [] = {
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"CPU cycles",
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"instructions",
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"cache-refs",
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"cache-misses",
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"branches",
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"branch-misses",
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"bus cycles"
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};
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const unsigned int default_count[] = {
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1000000,
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1000000,
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10000,
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10000,
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1000000,
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10000,
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};
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/*
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* prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all
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* counters in the current task.
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*/
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#define PR_TASK_PERF_COUNTERS_DISABLE 31
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#define PR_TASK_PERF_COUNTERS_ENABLE 32
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#define MAX_COUNTERS 8
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static int nr_counters = -1;
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static __u64 count_filter = 100;
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#define MAX_NR_CPUS 256
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static int event_count[MAX_COUNTERS];
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static unsigned long event_id[MAX_COUNTERS];
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static int event_raw[MAX_COUNTERS];
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static int tid = -1;
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static int profile_cpu = -1;
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static int nr_cpus = 0;
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static int nmi = 1;
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static int group = 0;
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static char *vmlinux;
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static char *sym_filter;
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static unsigned long filter_start;
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static unsigned long filter_end;
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static int delay_secs = 2;
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static int zero;
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static int dump_symtab;
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struct source_line {
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uint64_t EIP;
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unsigned long count;
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char *line;
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};
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static GList *lines;
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static void display_help(void)
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{
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printf(
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"Usage: kerneltop [<options>]\n\n"
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"KernelTop Options (up to %d event types can be specified at once):\n\n",
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MAX_COUNTERS);
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printf(
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" -e EID --event_id=EID # event type ID [default: 0]\n"
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" 0: CPU cycles\n"
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" 1: instructions\n"
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" 2: cache accesses\n"
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" 3: cache misses\n"
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" 4: branch instructions\n"
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" 5: branch prediction misses\n"
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" 6: bus cycles\n\n"
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" rNNN: raw PMU events (eventsel+umask)\n\n"
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" -c CNT --count=CNT # event period to sample\n\n"
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" -C CPU --cpu=CPU # CPU (-1 for all) [default: -1]\n"
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" -p PID --pid=PID # PID of sampled task (-1 for all) [default: -1]\n\n"
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" -d delay --delay=<seconds> # sampling/display delay [default: 2]\n"
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" -f CNT --filter=CNT # min-event-count filter [default: 100]\n\n"
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" -s symbol --symbol=<symbol> # function to be showed annotated one-shot\n"
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" -x path --vmlinux=<path> # the vmlinux binary, required for -s use:\n"
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" -z --zero # zero counts after display\n"
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" -D --dump_symtab # dump symbol table to stderr on startup\n"
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"\n");
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exit(0);
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}
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static void process_options(int argc, char *argv[])
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{
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int error = 0, counter;
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for (;;) {
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int option_index = 0;
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/** Options for getopt */
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static struct option long_options[] = {
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{"count", required_argument, NULL, 'c'},
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{"cpu", required_argument, NULL, 'C'},
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{"delay", required_argument, NULL, 'd'},
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{"dump_symtab", no_argument, NULL, 'D'},
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{"event_id", required_argument, NULL, 'e'},
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{"filter", required_argument, NULL, 'f'},
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{"group", required_argument, NULL, 'g'},
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{"help", no_argument, NULL, 'h'},
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{"nmi", required_argument, NULL, 'n'},
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{"pid", required_argument, NULL, 'p'},
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{"vmlinux", required_argument, NULL, 'x'},
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{"symbol", required_argument, NULL, 's'},
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{"zero", no_argument, NULL, 'z'},
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{NULL, 0, NULL, 0 }
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};
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int c = getopt_long(argc, argv, "c:C:d:De:f:g:hn:p:s:x:z",
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long_options, &option_index);
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if (c == -1)
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break;
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switch (c) {
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case 'c':
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if (nr_counters == -1)
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nr_counters = 0;
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event_count[nr_counters] = atoi(optarg); break;
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case 'C':
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/* CPU and PID are mutually exclusive */
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if (tid != -1) {
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printf("WARNING: CPU switch overriding PID\n");
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sleep(1);
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tid = -1;
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}
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profile_cpu = atoi(optarg); break;
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case 'd': delay_secs = atoi(optarg); break;
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case 'D': dump_symtab = 1; break;
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case 'e':
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nr_counters++;
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if (nr_counters == MAX_COUNTERS) {
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error = 1;
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break;
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}
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if (*optarg == 'r') {
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event_raw[nr_counters] = 1;
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++optarg;
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}
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event_id[nr_counters] = strtol(optarg, NULL, 16);
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break;
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case 'f': count_filter = atoi(optarg); break;
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case 'g': group = atoi(optarg); break;
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case 'h': display_help(); break;
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case 'n': nmi = atoi(optarg); break;
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case 'p':
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/* CPU and PID are mutually exclusive */
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if (profile_cpu != -1) {
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printf("WARNING: PID switch overriding CPU\n");
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sleep(1);
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profile_cpu = -1;
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}
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tid = atoi(optarg); break;
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case 's': sym_filter = strdup(optarg); break;
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case 'x': vmlinux = strdup(optarg); break;
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case 'z': zero = 1; break;
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default: error = 1; break;
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}
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}
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if (error)
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display_help();
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nr_counters++;
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if (nr_counters < 1)
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nr_counters = 1;
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for (counter = 0; counter < nr_counters; counter++) {
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if (event_count[counter])
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continue;
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if (event_id[counter] < PERF_HW_EVENTS_MAX)
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event_count[counter] = default_count[event_id[counter]];
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else
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event_count[counter] = 100000;
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}
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}
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static uint64_t min_ip;
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static uint64_t max_ip = -1ll;
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struct sym_entry {
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unsigned long long addr;
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char *sym;
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unsigned long count[MAX_COUNTERS];
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int skip;
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GList *source;
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};
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#define MAX_SYMS 100000
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static int sym_table_count;
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struct sym_entry *sym_filter_entry;
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static struct sym_entry sym_table[MAX_SYMS];
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static void show_details(struct sym_entry *sym);
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/*
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* Ordering weight: count-1 * count-1 * ... / count-n
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*/
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static double sym_weight(const struct sym_entry *sym)
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{
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double weight;
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int counter;
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weight = sym->count[0];
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for (counter = 1; counter < nr_counters-1; counter++)
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weight *= sym->count[counter];
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weight /= (sym->count[counter] + 1);
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return weight;
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}
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static int compare(const void *__sym1, const void *__sym2)
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{
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const struct sym_entry *sym1 = __sym1, *sym2 = __sym2;
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return sym_weight(sym1) < sym_weight(sym2);
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}
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static time_t last_refresh;
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static long events;
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static long userspace_events;
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static const char CONSOLE_CLEAR[] = "[H[2J";
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static struct sym_entry tmp[MAX_SYMS];
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static void print_sym_table(void)
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{
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int i, printed;
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int counter;
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float events_per_sec = events/delay_secs;
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float kevents_per_sec = (events-userspace_events)/delay_secs;
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memcpy(tmp, sym_table, sizeof(sym_table[0])*sym_table_count);
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qsort(tmp, sym_table_count, sizeof(tmp[0]), compare);
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write(1, CONSOLE_CLEAR, strlen(CONSOLE_CLEAR));
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printf(
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"------------------------------------------------------------------------------\n");
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printf( " KernelTop:%8.0f irqs/sec kernel:%3.1f%% [%s, ",
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events_per_sec,
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100.0 - (100.0*((events_per_sec-kevents_per_sec)/events_per_sec)),
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nmi ? "NMI" : "IRQ");
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if (nr_counters == 1)
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printf("%d ", event_count[0]);
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for (counter = 0; counter < nr_counters; counter++) {
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if (counter)
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printf("/");
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if (event_id[counter] < PERF_HW_EVENTS_MAX)
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printf( "%s", event_types[event_id[counter]]);
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else
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printf( "raw:%04lx", event_id[counter]);
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}
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printf( "], ");
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if (tid != -1)
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printf(" (tid: %d", tid);
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else
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printf(" (all");
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if (profile_cpu != -1)
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printf(", cpu: %d)\n", profile_cpu);
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else {
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if (tid != -1)
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printf(")\n");
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else
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printf(", %d CPUs)\n", nr_cpus);
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}
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printf("------------------------------------------------------------------------------\n\n");
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if (nr_counters == 1)
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printf(" events");
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else
|
||||
printf(" weight events");
|
||||
|
||||
printf(" RIP kernel function\n"
|
||||
" ______ ______ ________________ _______________\n\n"
|
||||
);
|
||||
|
||||
printed = 0;
|
||||
for (i = 0; i < sym_table_count; i++) {
|
||||
int count;
|
||||
|
||||
if (nr_counters == 1) {
|
||||
if (printed <= 18 &&
|
||||
tmp[i].count[0] >= count_filter) {
|
||||
printf("%19.2f - %016llx : %s\n",
|
||||
sym_weight(tmp + i), tmp[i].addr, tmp[i].sym);
|
||||
printed++;
|
||||
}
|
||||
} else {
|
||||
if (printed <= 18 &&
|
||||
tmp[i].count[0] >= count_filter) {
|
||||
printf("%8.1f %10ld - %016llx : %s\n",
|
||||
sym_weight(tmp + i),
|
||||
tmp[i].count[0],
|
||||
tmp[i].addr, tmp[i].sym);
|
||||
printed++;
|
||||
}
|
||||
}
|
||||
/*
|
||||
* Add decay to the counts:
|
||||
*/
|
||||
for (count = 0; count < nr_counters; count++)
|
||||
sym_table[i].count[count] = zero ? 0 : sym_table[i].count[count] * 7 / 8;
|
||||
}
|
||||
|
||||
if (sym_filter_entry)
|
||||
show_details(sym_filter_entry);
|
||||
|
||||
last_refresh = time(NULL);
|
||||
|
||||
{
|
||||
struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
|
||||
|
||||
if (poll(&stdin_poll, 1, 0) == 1) {
|
||||
printf("key pressed - exiting.\n");
|
||||
exit(0);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static int read_symbol(FILE *in, struct sym_entry *s)
|
||||
{
|
||||
static int filter_match = 0;
|
||||
char *sym, stype;
|
||||
char str[500];
|
||||
int rc, pos;
|
||||
|
||||
rc = fscanf(in, "%llx %c %499s", &s->addr, &stype, str);
|
||||
if (rc == EOF)
|
||||
return -1;
|
||||
|
||||
assert(rc == 3);
|
||||
|
||||
/* skip until end of line: */
|
||||
pos = strlen(str);
|
||||
do {
|
||||
rc = fgetc(in);
|
||||
if (rc == '\n' || rc == EOF || pos >= 499)
|
||||
break;
|
||||
str[pos] = rc;
|
||||
pos++;
|
||||
} while (1);
|
||||
str[pos] = 0;
|
||||
|
||||
sym = str;
|
||||
|
||||
/* Filter out known duplicates and non-text symbols. */
|
||||
if (!strcmp(sym, "_text"))
|
||||
return 1;
|
||||
if (!min_ip && !strcmp(sym, "_stext"))
|
||||
return 1;
|
||||
if (!strcmp(sym, "_etext") || !strcmp(sym, "_sinittext"))
|
||||
return 1;
|
||||
if (stype != 'T' && stype != 't')
|
||||
return 1;
|
||||
if (!strncmp("init_module", sym, 11) || !strncmp("cleanup_module", sym, 14))
|
||||
return 1;
|
||||
if (strstr(sym, "_text_start") || strstr(sym, "_text_end"))
|
||||
return 1;
|
||||
|
||||
s->sym = malloc(strlen(str));
|
||||
assert(s->sym);
|
||||
|
||||
strcpy((char *)s->sym, str);
|
||||
s->skip = 0;
|
||||
|
||||
/* Tag events to be skipped. */
|
||||
if (!strcmp("default_idle", s->sym) || !strcmp("cpu_idle", s->sym))
|
||||
s->skip = 1;
|
||||
if (!strcmp("enter_idle", s->sym) || !strcmp("exit_idle", s->sym))
|
||||
s->skip = 1;
|
||||
|
||||
if (filter_match == 1) {
|
||||
filter_end = s->addr;
|
||||
filter_match = -1;
|
||||
if (filter_end - filter_start > 10000) {
|
||||
printf("hm, too large filter symbol <%s> - skipping.\n",
|
||||
sym_filter);
|
||||
printf("symbol filter start: %016lx\n", filter_start);
|
||||
printf(" end: %016lx\n", filter_end);
|
||||
filter_end = filter_start = 0;
|
||||
sym_filter = NULL;
|
||||
sleep(1);
|
||||
}
|
||||
}
|
||||
if (filter_match == 0 && sym_filter && !strcmp(s->sym, sym_filter)) {
|
||||
filter_match = 1;
|
||||
filter_start = s->addr;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int compare_addr(const void *__sym1, const void *__sym2)
|
||||
{
|
||||
const struct sym_entry *sym1 = __sym1, *sym2 = __sym2;
|
||||
|
||||
return sym1->addr > sym2->addr;
|
||||
}
|
||||
|
||||
static void sort_symbol_table(void)
|
||||
{
|
||||
int i, dups;
|
||||
|
||||
do {
|
||||
qsort(sym_table, sym_table_count, sizeof(sym_table[0]), compare_addr);
|
||||
for (i = 0, dups = 0; i < sym_table_count; i++) {
|
||||
if (sym_table[i].addr == sym_table[i+1].addr) {
|
||||
sym_table[i+1].addr = -1ll;
|
||||
dups++;
|
||||
}
|
||||
}
|
||||
sym_table_count -= dups;
|
||||
} while(dups);
|
||||
}
|
||||
|
||||
static void parse_symbols(void)
|
||||
{
|
||||
struct sym_entry *last;
|
||||
|
||||
FILE *kallsyms = fopen("/proc/kallsyms", "r");
|
||||
|
||||
if (!kallsyms) {
|
||||
printf("Could not open /proc/kallsyms - no CONFIG_KALLSYMS_ALL=y?\n");
|
||||
exit(-1);
|
||||
}
|
||||
|
||||
while (!feof(kallsyms)) {
|
||||
if (read_symbol(kallsyms, &sym_table[sym_table_count]) == 0) {
|
||||
sym_table_count++;
|
||||
assert(sym_table_count <= MAX_SYMS);
|
||||
}
|
||||
}
|
||||
|
||||
sort_symbol_table();
|
||||
min_ip = sym_table[0].addr;
|
||||
max_ip = sym_table[sym_table_count-1].addr;
|
||||
last = sym_table + sym_table_count++;
|
||||
|
||||
last->addr = -1ll;
|
||||
last->sym = "<end>";
|
||||
|
||||
if (filter_end) {
|
||||
int count;
|
||||
for (count=0; count < sym_table_count; count ++) {
|
||||
if (!strcmp(sym_table[count].sym, sym_filter)) {
|
||||
sym_filter_entry = &sym_table[count];
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (dump_symtab) {
|
||||
int i;
|
||||
|
||||
for (i = 0; i < sym_table_count; i++)
|
||||
fprintf(stderr, "%llx %s\n",
|
||||
sym_table[i].addr, sym_table[i].sym);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static void parse_vmlinux(char *filename)
|
||||
{
|
||||
FILE *file;
|
||||
char command[PATH_MAX*2];
|
||||
if (!filename)
|
||||
return;
|
||||
|
||||
sprintf(command, "objdump --start-address=0x%016lx --stop-address=0x%016lx -dS %s", filter_start, filter_end, filename);
|
||||
|
||||
file = popen(command, "r");
|
||||
if (!file)
|
||||
return;
|
||||
|
||||
while (!feof(file)) {
|
||||
struct source_line *src;
|
||||
size_t dummy = 0;
|
||||
char *c;
|
||||
|
||||
src = malloc(sizeof(struct source_line));
|
||||
assert(src != NULL);
|
||||
memset(src, 0, sizeof(struct source_line));
|
||||
|
||||
if (getline(&src->line, &dummy, file) < 0)
|
||||
break;
|
||||
if (!src->line)
|
||||
break;
|
||||
|
||||
c = strchr(src->line, '\n');
|
||||
if (c)
|
||||
*c = 0;
|
||||
|
||||
lines = g_list_prepend(lines, src);
|
||||
|
||||
if (strlen(src->line)>8 && src->line[8] == ':')
|
||||
src->EIP = strtoull(src->line, NULL, 16);
|
||||
if (strlen(src->line)>8 && src->line[16] == ':')
|
||||
src->EIP = strtoull(src->line, NULL, 16);
|
||||
}
|
||||
pclose(file);
|
||||
lines = g_list_reverse(lines);
|
||||
}
|
||||
|
||||
static void record_precise_ip(uint64_t ip)
|
||||
{
|
||||
struct source_line *line;
|
||||
GList *item;
|
||||
|
||||
item = g_list_first(lines);
|
||||
while (item) {
|
||||
line = item->data;
|
||||
if (line->EIP == ip)
|
||||
line->count++;
|
||||
if (line->EIP > ip)
|
||||
break;
|
||||
item = g_list_next(item);
|
||||
}
|
||||
}
|
||||
|
||||
static void lookup_sym_in_vmlinux(struct sym_entry *sym)
|
||||
{
|
||||
struct source_line *line;
|
||||
GList *item;
|
||||
char pattern[PATH_MAX];
|
||||
sprintf(pattern, "<%s>:", sym->sym);
|
||||
|
||||
item = g_list_first(lines);
|
||||
while (item) {
|
||||
line = item->data;
|
||||
if (strstr(line->line, pattern)) {
|
||||
sym->source = item;
|
||||
break;
|
||||
}
|
||||
item = g_list_next(item);
|
||||
}
|
||||
}
|
||||
|
||||
void show_lines(GList *item_queue, int item_queue_count)
|
||||
{
|
||||
int i;
|
||||
struct source_line *line;
|
||||
|
||||
for (i = 0; i < item_queue_count; i++) {
|
||||
line = item_queue->data;
|
||||
printf("%8li\t%s\n", line->count, line->line);
|
||||
item_queue = g_list_next(item_queue);
|
||||
}
|
||||
}
|
||||
|
||||
#define TRACE_COUNT 3
|
||||
|
||||
static void show_details(struct sym_entry *sym)
|
||||
{
|
||||
struct source_line *line;
|
||||
GList *item;
|
||||
int displayed = 0;
|
||||
GList *item_queue = NULL;
|
||||
int item_queue_count = 0;
|
||||
|
||||
if (!sym->source)
|
||||
lookup_sym_in_vmlinux(sym);
|
||||
if (!sym->source)
|
||||
return;
|
||||
|
||||
printf("Showing details for %s\n", sym->sym);
|
||||
|
||||
item = sym->source;
|
||||
while (item) {
|
||||
line = item->data;
|
||||
if (displayed && strstr(line->line, ">:"))
|
||||
break;
|
||||
|
||||
if (!item_queue_count)
|
||||
item_queue = item;
|
||||
item_queue_count ++;
|
||||
|
||||
if (line->count >= count_filter) {
|
||||
show_lines(item_queue, item_queue_count);
|
||||
item_queue_count = 0;
|
||||
item_queue = NULL;
|
||||
} else if (item_queue_count > TRACE_COUNT) {
|
||||
item_queue = g_list_next(item_queue);
|
||||
item_queue_count --;
|
||||
}
|
||||
|
||||
line->count = 0;
|
||||
displayed++;
|
||||
if (displayed > 300)
|
||||
break;
|
||||
item = g_list_next(item);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Binary search in the histogram table and record the hit:
|
||||
*/
|
||||
static void record_ip(uint64_t ip, int counter)
|
||||
{
|
||||
int left_idx, middle_idx, right_idx, idx;
|
||||
unsigned long left, middle, right;
|
||||
|
||||
record_precise_ip(ip);
|
||||
|
||||
left_idx = 0;
|
||||
right_idx = sym_table_count-1;
|
||||
assert(ip <= max_ip && ip >= min_ip);
|
||||
|
||||
while (left_idx + 1 < right_idx) {
|
||||
middle_idx = (left_idx + right_idx) / 2;
|
||||
|
||||
left = sym_table[ left_idx].addr;
|
||||
middle = sym_table[middle_idx].addr;
|
||||
right = sym_table[ right_idx].addr;
|
||||
|
||||
if (!(left <= middle && middle <= right)) {
|
||||
printf("%016lx...\n%016lx...\n%016lx\n", left, middle, right);
|
||||
printf("%d %d %d\n", left_idx, middle_idx, right_idx);
|
||||
}
|
||||
assert(left <= middle && middle <= right);
|
||||
if (!(left <= ip && ip <= right)) {
|
||||
printf(" left: %016lx\n", left);
|
||||
printf(" ip: %016lx\n", ip);
|
||||
printf("right: %016lx\n", right);
|
||||
}
|
||||
assert(left <= ip && ip <= right);
|
||||
/*
|
||||
* [ left .... target .... middle .... right ]
|
||||
* => right := middle
|
||||
*/
|
||||
if (ip < middle) {
|
||||
right_idx = middle_idx;
|
||||
continue;
|
||||
}
|
||||
/*
|
||||
* [ left .... middle ... target ... right ]
|
||||
* => left := middle
|
||||
*/
|
||||
left_idx = middle_idx;
|
||||
}
|
||||
|
||||
idx = left_idx;
|
||||
|
||||
if (!sym_table[idx].skip)
|
||||
sym_table[idx].count[counter]++;
|
||||
else events--;
|
||||
}
|
||||
|
||||
static void process_event(uint64_t ip, int counter)
|
||||
{
|
||||
events++;
|
||||
|
||||
if (ip < min_ip || ip > max_ip) {
|
||||
userspace_events++;
|
||||
return;
|
||||
}
|
||||
|
||||
record_ip(ip, counter);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
struct pollfd event_array[MAX_NR_CPUS][MAX_COUNTERS];
|
||||
struct perf_counter_hw_event hw_event;
|
||||
int fd[MAX_NR_CPUS][MAX_COUNTERS];
|
||||
int i, counter, group_fd;
|
||||
unsigned int cpu;
|
||||
uint64_t ip;
|
||||
ssize_t res;
|
||||
int ret;
|
||||
|
||||
process_options(argc, argv);
|
||||
|
||||
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
|
||||
if (tid != -1 || profile_cpu != -1)
|
||||
nr_cpus = 1;
|
||||
|
||||
assert(nr_cpus <= MAX_NR_CPUS);
|
||||
|
||||
for (i = 0; i < nr_cpus; i++) {
|
||||
group_fd = -1;
|
||||
for (counter = 0; counter < nr_counters; counter++) {
|
||||
|
||||
cpu = profile_cpu;
|
||||
if (tid == -1 && profile_cpu == -1)
|
||||
cpu = i;
|
||||
|
||||
memset(&hw_event, 0, sizeof(hw_event));
|
||||
hw_event.type = event_id[counter];
|
||||
hw_event.raw = event_raw[counter];
|
||||
hw_event.irq_period = event_count[counter];
|
||||
hw_event.record_type = PERF_RECORD_IRQ;
|
||||
hw_event.nmi = nmi;
|
||||
|
||||
fd[i][counter] = sys_perf_counter_open(&hw_event, tid, cpu, group_fd, 0);
|
||||
fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
|
||||
if (fd[i][counter] < 0) {
|
||||
printf("kerneltop error: syscall returned with %d (%s)\n",
|
||||
fd[i][counter], strerror(-fd[i][counter]));
|
||||
if (fd[i][counter] == -1)
|
||||
printf("Are you root?\n");
|
||||
exit(-1);
|
||||
}
|
||||
assert(fd[i][counter] >= 0);
|
||||
|
||||
/*
|
||||
* First counter acts as the group leader:
|
||||
*/
|
||||
if (group && group_fd == -1)
|
||||
group_fd = fd[i][counter];
|
||||
|
||||
event_array[i][counter].fd = fd[i][counter];
|
||||
event_array[i][counter].events = POLLIN;
|
||||
}
|
||||
}
|
||||
|
||||
parse_symbols();
|
||||
if (vmlinux && sym_filter_entry)
|
||||
parse_vmlinux(vmlinux);
|
||||
|
||||
printf("KernelTop refresh period: %d seconds\n", delay_secs);
|
||||
last_refresh = time(NULL);
|
||||
|
||||
while (1) {
|
||||
int hits = events;
|
||||
|
||||
for (i = 0; i < nr_cpus; i++) {
|
||||
for (counter = 0; counter < nr_counters; counter++) {
|
||||
res = read(fd[i][counter], (char *) &ip, sizeof(ip));
|
||||
if (res > 0) {
|
||||
assert(res == sizeof(ip));
|
||||
|
||||
process_event(ip, counter);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (time(NULL) >= last_refresh + delay_secs) {
|
||||
print_sym_table();
|
||||
events = userspace_events = 0;
|
||||
}
|
||||
|
||||
if (hits == events)
|
||||
ret = poll(event_array[0], nr_cpus, 1000);
|
||||
hits = events;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
521
Documentation/perf_counter/perfstat.c
Normal file
521
Documentation/perf_counter/perfstat.c
Normal file
|
@ -0,0 +1,521 @@
|
|||
/*
|
||||
* perfstat: /usr/bin/time -alike performance counter statistics utility
|
||||
*
|
||||
* It summarizes the counter events of all tasks (and child tasks),
|
||||
* covering all CPUs that the command (or workload) executes on.
|
||||
* It only counts the per-task events of the workload started,
|
||||
* independent of how many other tasks run on those CPUs.
|
||||
*
|
||||
* Build with: cc -O2 -g -lrt -Wall -W -o perfstat perfstat.c
|
||||
*
|
||||
* Sample output:
|
||||
*
|
||||
|
||||
$ ./perfstat -e 1 -e 3 -e 5 ls -lR /usr/include/ >/dev/null
|
||||
|
||||
Performance counter stats for 'ls':
|
||||
|
||||
163516953 instructions
|
||||
2295 cache-misses
|
||||
2855182 branch-misses
|
||||
|
||||
*
|
||||
* Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
|
||||
*
|
||||
* Released under the GPLv2 (not later).
|
||||
*
|
||||
* Percpu counter support by: Yanmin Zhang <yanmin_zhang@linux.intel.com>
|
||||
* Symbolic event options by: Wu Fengguang <fengguang.wu@intel.com>
|
||||
*/
|
||||
#define _GNU_SOURCE
|
||||
|
||||
#include <assert.h>
|
||||
#include <getopt.h>
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
#include <ctype.h>
|
||||
#include <errno.h>
|
||||
#include <fcntl.h>
|
||||
#include <stdio.h>
|
||||
#include <time.h>
|
||||
|
||||
#include <sys/syscall.h>
|
||||
#include <sys/ioctl.h>
|
||||
#include <sys/prctl.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/wait.h>
|
||||
#include <sys/uio.h>
|
||||
|
||||
#include <linux/unistd.h>
|
||||
|
||||
#ifdef __x86_64__
|
||||
# define __NR_perf_counter_open 295
|
||||
#endif
|
||||
|
||||
#ifdef __i386__
|
||||
# define __NR_perf_counter_open 333
|
||||
#endif
|
||||
|
||||
#ifdef __powerpc__
|
||||
#define __NR_perf_counter_open 319
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Pick up some kernel type conventions:
|
||||
*/
|
||||
#define __user
|
||||
#define asmlinkage
|
||||
|
||||
typedef unsigned int __u32;
|
||||
typedef unsigned long long __u64;
|
||||
typedef long long __s64;
|
||||
|
||||
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
||||
|
||||
/*
|
||||
* User-space ABI bits:
|
||||
*/
|
||||
|
||||
/*
|
||||
* Generalized performance counter event types, used by the hw_event.type
|
||||
* parameter of the sys_perf_counter_open() syscall:
|
||||
*/
|
||||
enum hw_event_types {
|
||||
/*
|
||||
* Common hardware events, generalized by the kernel:
|
||||
*/
|
||||
PERF_COUNT_CPU_CYCLES = 0,
|
||||
PERF_COUNT_INSTRUCTIONS = 1,
|
||||
PERF_COUNT_CACHE_REFERENCES = 2,
|
||||
PERF_COUNT_CACHE_MISSES = 3,
|
||||
PERF_COUNT_BRANCH_INSTRUCTIONS = 4,
|
||||
PERF_COUNT_BRANCH_MISSES = 5,
|
||||
PERF_COUNT_BUS_CYCLES = 6,
|
||||
|
||||
PERF_HW_EVENTS_MAX = 7,
|
||||
|
||||
/*
|
||||
* Special "software" counters provided by the kernel, even if
|
||||
* the hardware does not support performance counters. These
|
||||
* counters measure various physical and sw events of the
|
||||
* kernel (and allow the profiling of them as well):
|
||||
*/
|
||||
PERF_COUNT_CPU_CLOCK = -1,
|
||||
PERF_COUNT_TASK_CLOCK = -2,
|
||||
PERF_COUNT_PAGE_FAULTS = -3,
|
||||
PERF_COUNT_CONTEXT_SWITCHES = -4,
|
||||
PERF_COUNT_CPU_MIGRATIONS = -5,
|
||||
|
||||
PERF_SW_EVENTS_MIN = -6,
|
||||
};
|
||||
|
||||
/*
|
||||
* IRQ-notification data record type:
|
||||
*/
|
||||
enum perf_counter_record_type {
|
||||
PERF_RECORD_SIMPLE = 0,
|
||||
PERF_RECORD_IRQ = 1,
|
||||
PERF_RECORD_GROUP = 2,
|
||||
};
|
||||
|
||||
/*
|
||||
* Hardware event to monitor via a performance monitoring counter:
|
||||
*/
|
||||
struct perf_counter_hw_event {
|
||||
__s64 type;
|
||||
|
||||
__u64 irq_period;
|
||||
__u64 record_type;
|
||||
__u64 read_format;
|
||||
|
||||
__u64 disabled : 1, /* off by default */
|
||||
nmi : 1, /* NMI sampling */
|
||||
raw : 1, /* raw event type */
|
||||
inherit : 1, /* children inherit it */
|
||||
pinned : 1, /* must always be on PMU */
|
||||
exclusive : 1, /* only group on PMU */
|
||||
exclude_user : 1, /* don't count user */
|
||||
exclude_kernel : 1, /* ditto kernel */
|
||||
exclude_hv : 1, /* ditto hypervisor */
|
||||
exclude_idle : 1, /* don't count when idle */
|
||||
|
||||
__reserved_1 : 54;
|
||||
|
||||
__u32 extra_config_len;
|
||||
__u32 __reserved_4;
|
||||
|
||||
__u64 __reserved_2;
|
||||
__u64 __reserved_3;
|
||||
};
|
||||
|
||||
/*
|
||||
* Ioctls that can be done on a perf counter fd:
|
||||
*/
|
||||
#define PERF_COUNTER_IOC_ENABLE _IO('$', 0)
|
||||
#define PERF_COUNTER_IOC_DISABLE _IO('$', 1)
|
||||
|
||||
asmlinkage int sys_perf_counter_open(
|
||||
|
||||
struct perf_counter_hw_event *hw_event_uptr __user,
|
||||
pid_t pid,
|
||||
int cpu,
|
||||
int group_fd,
|
||||
unsigned long flags)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = syscall(
|
||||
__NR_perf_counter_open, hw_event_uptr, pid, cpu, group_fd, flags);
|
||||
#if defined(__x86_64__) || defined(__i386__)
|
||||
if (ret < 0 && ret > -4096) {
|
||||
errno = -ret;
|
||||
ret = -1;
|
||||
}
|
||||
#endif
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
static char *hw_event_names [] = {
|
||||
"CPU cycles",
|
||||
"instructions",
|
||||
"cache references",
|
||||
"cache misses",
|
||||
"branches",
|
||||
"branch misses",
|
||||
"bus cycles",
|
||||
};
|
||||
|
||||
static char *sw_event_names [] = {
|
||||
"cpu clock ticks",
|
||||
"task clock ticks",
|
||||
"pagefaults",
|
||||
"context switches",
|
||||
"CPU migrations",
|
||||
};
|
||||
|
||||
struct event_symbol {
|
||||
int event;
|
||||
char *symbol;
|
||||
};
|
||||
|
||||
static struct event_symbol event_symbols [] = {
|
||||
{PERF_COUNT_CPU_CYCLES, "cpu-cycles", },
|
||||
{PERF_COUNT_CPU_CYCLES, "cycles", },
|
||||
{PERF_COUNT_INSTRUCTIONS, "instructions", },
|
||||
{PERF_COUNT_CACHE_REFERENCES, "cache-references", },
|
||||
{PERF_COUNT_CACHE_MISSES, "cache-misses", },
|
||||
{PERF_COUNT_BRANCH_INSTRUCTIONS, "branch-instructions", },
|
||||
{PERF_COUNT_BRANCH_INSTRUCTIONS, "branches", },
|
||||
{PERF_COUNT_BRANCH_MISSES, "branch-misses", },
|
||||
{PERF_COUNT_BUS_CYCLES, "bus-cycles", },
|
||||
{PERF_COUNT_CPU_CLOCK, "cpu-ticks", },
|
||||
{PERF_COUNT_CPU_CLOCK, "ticks", },
|
||||
{PERF_COUNT_TASK_CLOCK, "task-ticks", },
|
||||
{PERF_COUNT_PAGE_FAULTS, "page-faults", },
|
||||
{PERF_COUNT_PAGE_FAULTS, "faults", },
|
||||
{PERF_COUNT_CONTEXT_SWITCHES, "context-switches", },
|
||||
{PERF_COUNT_CONTEXT_SWITCHES, "cs", },
|
||||
{PERF_COUNT_CPU_MIGRATIONS, "cpu-migrations", },
|
||||
{PERF_COUNT_CPU_MIGRATIONS, "migrations", },
|
||||
};
|
||||
|
||||
#define MAX_COUNTERS 64
|
||||
#define MAX_NR_CPUS 256
|
||||
|
||||
static int nr_counters = 0;
|
||||
static int nr_cpus = 0;
|
||||
|
||||
static int event_id[MAX_COUNTERS] =
|
||||
{ -2, -5, -4, -3, 0, 1, 2, 3};
|
||||
|
||||
static int event_raw[MAX_COUNTERS];
|
||||
|
||||
static int system_wide = 0;
|
||||
|
||||
static void display_help(void)
|
||||
{
|
||||
unsigned int i;
|
||||
int e;
|
||||
|
||||
printf(
|
||||
"Usage: perfstat [<events...>] <cmd...>\n\n"
|
||||
"PerfStat Options (up to %d event types can be specified):\n\n",
|
||||
MAX_COUNTERS);
|
||||
printf(
|
||||
" -e EVENT --event=EVENT # symbolic-name abbreviations");
|
||||
|
||||
for (i = 0, e = PERF_HW_EVENTS_MAX; i < ARRAY_SIZE(event_symbols); i++) {
|
||||
if (e != event_symbols[i].event) {
|
||||
e = event_symbols[i].event;
|
||||
printf(
|
||||
"\n %2d: %-20s", e, event_symbols[i].symbol);
|
||||
} else
|
||||
printf(" %s", event_symbols[i].symbol);
|
||||
}
|
||||
|
||||
printf("\n"
|
||||
" rNNN: raw event type\n\n"
|
||||
" -s # system-wide collection\n\n"
|
||||
" -c <cmd..> --command=<cmd..> # command+arguments to be timed.\n"
|
||||
"\n");
|
||||
exit(0);
|
||||
}
|
||||
|
||||
static int type_valid(int type)
|
||||
{
|
||||
if (type >= PERF_HW_EVENTS_MAX)
|
||||
return 0;
|
||||
if (type <= PERF_SW_EVENTS_MIN)
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static char *event_name(int ctr)
|
||||
{
|
||||
int type = event_id[ctr];
|
||||
static char buf[32];
|
||||
|
||||
if (event_raw[ctr]) {
|
||||
sprintf(buf, "raw 0x%x", type);
|
||||
return buf;
|
||||
}
|
||||
if (!type_valid(type))
|
||||
return "unknown";
|
||||
|
||||
if (type >= 0)
|
||||
return hw_event_names[type];
|
||||
|
||||
return sw_event_names[-type-1];
|
||||
}
|
||||
|
||||
/*
|
||||
* Each event can have multiple symbolic names.
|
||||
* Symbolic names are (almost) exactly matched.
|
||||
*/
|
||||
static int match_event_symbols(char *str)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
if (isdigit(str[0]) || str[0] == '-')
|
||||
return atoi(str);
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
|
||||
if (!strncmp(str, event_symbols[i].symbol,
|
||||
strlen(event_symbols[i].symbol)))
|
||||
return event_symbols[i].event;
|
||||
}
|
||||
|
||||
return PERF_HW_EVENTS_MAX;
|
||||
}
|
||||
|
||||
static void parse_events(char *str)
|
||||
{
|
||||
int type, raw;
|
||||
|
||||
again:
|
||||
nr_counters++;
|
||||
if (nr_counters == MAX_COUNTERS)
|
||||
display_help();
|
||||
|
||||
raw = 0;
|
||||
if (*str == 'r') {
|
||||
raw = 1;
|
||||
++str;
|
||||
type = strtol(str, NULL, 16);
|
||||
} else {
|
||||
type = match_event_symbols(str);
|
||||
if (!type_valid(type))
|
||||
display_help();
|
||||
}
|
||||
|
||||
event_id[nr_counters] = type;
|
||||
event_raw[nr_counters] = raw;
|
||||
|
||||
str = strstr(str, ",");
|
||||
if (str) {
|
||||
str++;
|
||||
goto again;
|
||||
}
|
||||
}
|
||||
|
||||
static void process_options(int argc, char *argv[])
|
||||
{
|
||||
for (;;) {
|
||||
int option_index = 0;
|
||||
/** Options for getopt */
|
||||
static struct option long_options[] = {
|
||||
{"event", required_argument, NULL, 'e'},
|
||||
{"help", no_argument, NULL, 'h'},
|
||||
{"command", no_argument, NULL, 'c'},
|
||||
{NULL, 0, NULL, 0 }
|
||||
};
|
||||
int c = getopt_long(argc, argv, "+:e:c:s",
|
||||
long_options, &option_index);
|
||||
if (c == -1)
|
||||
break;
|
||||
|
||||
switch (c) {
|
||||
case 'c':
|
||||
break;
|
||||
case 's':
|
||||
system_wide = 1;
|
||||
break;
|
||||
case 'e':
|
||||
parse_events(optarg);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (optind == argc)
|
||||
goto err;
|
||||
|
||||
if (!nr_counters)
|
||||
nr_counters = 8;
|
||||
else
|
||||
nr_counters++;
|
||||
return;
|
||||
|
||||
err:
|
||||
display_help();
|
||||
}
|
||||
|
||||
char fault_here[1000000];
|
||||
|
||||
#define PR_TASK_PERF_COUNTERS_DISABLE 31
|
||||
#define PR_TASK_PERF_COUNTERS_ENABLE 32
|
||||
|
||||
static int fd[MAX_NR_CPUS][MAX_COUNTERS];
|
||||
|
||||
static void create_counter(int counter)
|
||||
{
|
||||
struct perf_counter_hw_event hw_event;
|
||||
|
||||
memset(&hw_event, 0, sizeof(hw_event));
|
||||
hw_event.type = event_id[counter];
|
||||
hw_event.raw = event_raw[counter];
|
||||
hw_event.record_type = PERF_RECORD_SIMPLE;
|
||||
hw_event.nmi = 0;
|
||||
|
||||
if (system_wide) {
|
||||
int cpu;
|
||||
for (cpu = 0; cpu < nr_cpus; cpu ++) {
|
||||
fd[cpu][counter] = sys_perf_counter_open(&hw_event, -1, cpu, -1, 0);
|
||||
if (fd[cpu][counter] < 0) {
|
||||
printf("perfstat error: syscall returned with %d (%s)\n",
|
||||
fd[cpu][counter], strerror(errno));
|
||||
exit(-1);
|
||||
}
|
||||
|
||||
}
|
||||
} else {
|
||||
hw_event.inherit = 1;
|
||||
hw_event.disabled = 1;
|
||||
|
||||
fd[0][counter] = sys_perf_counter_open(&hw_event, 0, -1, -1, 0);
|
||||
if (fd[0][counter] < 0) {
|
||||
printf("perfstat error: syscall returned with %d (%s)\n",
|
||||
fd[0][counter], strerror(errno));
|
||||
exit(-1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#define rdclock() \
|
||||
({ \
|
||||
struct timespec ts; \
|
||||
\
|
||||
clock_gettime(CLOCK_MONOTONIC, &ts); \
|
||||
ts.tv_sec * 1000000000ULL + ts.tv_nsec; \
|
||||
})
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
unsigned long long t0, t1;
|
||||
int counter;
|
||||
ssize_t res;
|
||||
int status;
|
||||
int pid;
|
||||
|
||||
process_options(argc, argv);
|
||||
|
||||
if (system_wide) {
|
||||
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
|
||||
assert(nr_cpus <= MAX_NR_CPUS);
|
||||
assert(nr_cpus >= 0);
|
||||
} else
|
||||
nr_cpus = 1;
|
||||
|
||||
for (counter = 0; counter < nr_counters; counter++)
|
||||
create_counter(counter);
|
||||
|
||||
argc -= optind;
|
||||
argv += optind;
|
||||
|
||||
/*
|
||||
* Enable counters and exec the command:
|
||||
*/
|
||||
t0 = rdclock();
|
||||
prctl(PR_TASK_PERF_COUNTERS_ENABLE);
|
||||
|
||||
if ((pid = fork()) < 0)
|
||||
perror("failed to fork");
|
||||
if (!pid) {
|
||||
if (execvp(argv[0], argv)) {
|
||||
perror(argv[0]);
|
||||
exit(-1);
|
||||
}
|
||||
}
|
||||
while (wait(&status) >= 0)
|
||||
;
|
||||
prctl(PR_TASK_PERF_COUNTERS_DISABLE);
|
||||
t1 = rdclock();
|
||||
|
||||
fflush(stdout);
|
||||
|
||||
fprintf(stderr, "\n");
|
||||
fprintf(stderr, " Performance counter stats for \'%s\':\n",
|
||||
argv[0]);
|
||||
fprintf(stderr, "\n");
|
||||
|
||||
for (counter = 0; counter < nr_counters; counter++) {
|
||||
int cpu;
|
||||
__u64 count, single_count;
|
||||
|
||||
count = 0;
|
||||
for (cpu = 0; cpu < nr_cpus; cpu ++) {
|
||||
res = read(fd[cpu][counter],
|
||||
(char *) &single_count, sizeof(single_count));
|
||||
assert(res == sizeof(single_count));
|
||||
count += single_count;
|
||||
}
|
||||
|
||||
if (!event_raw[counter] &&
|
||||
(event_id[counter] == PERF_COUNT_CPU_CLOCK ||
|
||||
event_id[counter] == PERF_COUNT_TASK_CLOCK)) {
|
||||
|
||||
double msecs = (double)count / 1000000;
|
||||
|
||||
fprintf(stderr, " %14.6f %-20s (msecs)\n",
|
||||
msecs, event_name(counter));
|
||||
} else {
|
||||
fprintf(stderr, " %14Ld %-20s (events)\n",
|
||||
count, event_name(counter));
|
||||
}
|
||||
if (!counter)
|
||||
fprintf(stderr, "\n");
|
||||
}
|
||||
fprintf(stderr, "\n");
|
||||
fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n",
|
||||
(double)(t1-t0)/1e6);
|
||||
fprintf(stderr, "\n");
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
Reference in a new issue