mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Pull perf updates from Ingo Molnar: "Kernel side changes: - Intel Knights Landing support. (Harish Chegondi) - Intel Broadwell-EP uncore PMU support. (Kan Liang) - Core code improvements. (Peter Zijlstra.) - Event filter, LBR and PEBS fixes. (Stephane Eranian) - Enable cycles:pp on Intel Atom. (Stephane Eranian) - Add cycles:ppp support for Skylake. (Andi Kleen) - Various x86 NMI overhead optimizations. (Andi Kleen) - Intel PT enhancements. (Takao Indoh) - AMD cache events fix. (Vince Weaver) Tons of tooling changes: - Show random perf tool tips in the 'perf report' bottom line (Namhyung Kim) - perf report now defaults to --group if the perf.data file has grouped events, try it with: # perf record -e '{cycles,instructions}' -a sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 1.093 MB perf.data (1247 samples) ] # perf report # Samples: 1K of event 'anon group { cycles, instructions }' # Event count (approx.): 1955219195 # # Overhead Command Shared Object Symbol 2.86% 0.22% swapper [kernel.kallsyms] [k] intel_idle 1.05% 0.33% firefox libxul.so [.] js::SetObjectElement 1.05% 0.00% kworker/0:3 [kernel.kallsyms] [k] gen6_ring_get_seqno 0.88% 0.17% chrome chrome [.] 0x0000000000ee27ab 0.65% 0.86% firefox libxul.so [.] js::ValueToId<(js::AllowGC)1> 0.64% 0.23% JS Helper libxul.so [.] js::SplayTree<js::jit::LiveRange*, js::jit::LiveRange>::splay 0.62% 1.27% firefox libxul.so [.] js::GetIterator 0.61% 1.74% firefox libxul.so [.] js::NativeSetProperty 0.61% 0.31% firefox libxul.so [.] js::SetPropertyByDefining - Introduce the 'perf stat record/report' workflow: Generate perf.data files from 'perf stat', to tap into the scripting capabilities perf has instead of defining a 'perf stat' specific scripting support to calculate event ratios, etc. Simple example: $ perf stat record -e cycles usleep 1 Performance counter stats for 'usleep 1': 1,134,996 cycles 0.000670644 seconds time elapsed $ perf stat report Performance counter stats for '/home/acme/bin/perf stat record -e cycles usleep 1': 1,134,996 cycles 0.000670644 seconds time elapsed $ It generates PERF_RECORD_ userspace records to store the details: $ perf report -D | grep PERF_RECORD 0xf0 [0x28]: PERF_RECORD_THREAD_MAP nr: 1 thread: 27637 0x118 [0x12]: PERF_RECORD_CPU_MAP nr: 1 cpu: 65535 0x12a [0x40]: PERF_RECORD_STAT_CONFIG 0x16a [0x30]: PERF_RECORD_STAT -1 -1 0x19a [0x40]: PERF_RECORD_MMAP -1/0: [0xffffffff81000000(0x1f000000) @ 0xffffffff81000000]: x [kernel.kallsyms]_text 0x1da [0x18]: PERF_RECORD_STAT_ROUND [acme@ssdandy linux]$ An effort was made to make perf.data files generated like this to not generate cryptic messages when processed by older tools. The 'perf script' bits need rebasing, will go up later. - Make command line options always available, even when they depend on some feature being enabled, warning the user about use of such options (Wang Nan) - Support hw breakpoint events (mem:0xAddress) in the default output mode in 'perf script' (Wang Nan) - Fixes and improvements for supporting annotating ARM binaries, support ARM call and jump instructions, more work needed to have arch specific stuff separated into tools/perf/arch/*/annotate/ (Russell King) - Add initial 'perf config' command, for now just with a --list command to the contents of the configuration file in use and a basic man page describing its format, commands for doing edits and detailed documentation are being reviewed and proof-read. (Taeung Song) - Allows BPF scriptlets specify arguments to be fetched using DWARF info, using a prologue generated at compile/build time (He Kuang, Wang Nan) - Allow attaching BPF scriptlets to module symbols (Wang Nan) - Allow attaching BPF scriptlets to userspace code using uprobe (Wang Nan) - BPF programs now can specify 'perf probe' tunables via its section name, separating key=val values using semicolons (Wang Nan) Testing some of these new BPF features: Use case: get callchains when receiving SSL packets, filter then in the kernel, at arbitrary place. # cat ssl.bpf.c #define SEC(NAME) __attribute__((section(NAME), used)) struct pt_regs; SEC("func=__inet_lookup_established hnum") int func(struct pt_regs *ctx, int err, unsigned short port) { return err == 0 && port == 443; } char _license[] SEC("license") = "GPL"; int _version SEC("version") = LINUX_VERSION_CODE; # # perf record -a -g -e ssl.bpf.c ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.787 MB perf.data (3 samples) ] # perf script | head -30 swapper 0 [000] 58783.268118: perf_bpf_probe:func: (ffffffff816a0f60) hnum=0x1bb 8a0f61 __inet_lookup_established (/lib/modules/4.3.0+/build/vmlinux) 896def ip_rcv_finish (/lib/modules/4.3.0+/build/vmlinux) 8976c2 ip_rcv (/lib/modules/4.3.0+/build/vmlinux) 855eba __netif_receive_skb_core (/lib/modules/4.3.0+/build/vmlinux) 8565d8 __netif_receive_skb (/lib/modules/4.3.0+/build/vmlinux) 8572a8 process_backlog (/lib/modules/4.3.0+/build/vmlinux) 856b11 net_rx_action (/lib/modules/4.3.0+/build/vmlinux) 2a284b __do_softirq (/lib/modules/4.3.0+/build/vmlinux) 2a2ba3 irq_exit (/lib/modules/4.3.0+/build/vmlinux) 96b7a4 do_IRQ (/lib/modules/4.3.0+/build/vmlinux) 969807 ret_from_intr (/lib/modules/4.3.0+/build/vmlinux) 2dede5 cpu_startup_entry (/lib/modules/4.3.0+/build/vmlinux) 95d5bc rest_init (/lib/modules/4.3.0+/build/vmlinux) 1163ffa start_kernel ([kernel.vmlinux].init.text) 11634d7 x86_64_start_reservations ([kernel.vmlinux].init.text) 1163623 x86_64_start_kernel ([kernel.vmlinux].init.text) qemu-system-x86 9178 [003] 58785.792417: perf_bpf_probe:func: (ffffffff816a0f60) hnum=0x1bb 8a0f61 __inet_lookup_established (/lib/modules/4.3.0+/build/vmlinux) 896def ip_rcv_finish (/lib/modules/4.3.0+/build/vmlinux) 8976c2 ip_rcv (/lib/modules/4.3.0+/build/vmlinux) 855eba __netif_receive_skb_core (/lib/modules/4.3.0+/build/vmlinux) 8565d8 __netif_receive_skb (/lib/modules/4.3.0+/build/vmlinux) 856660 netif_receive_skb_internal (/lib/modules/4.3.0+/build/vmlinux) 8566ec netif_receive_skb_sk (/lib/modules/4.3.0+/build/vmlinux) 430a br_handle_frame_finish ([bridge]) 48bc br_handle_frame ([bridge]) 855f44 __netif_receive_skb_core (/lib/modules/4.3.0+/build/vmlinux) 8565d8 __netif_receive_skb (/lib/modules/4.3.0+/build/vmlinux) # - Use 'perf probe' various options to list functions, see what variables can be collected at any given point, experiment first collecting without a filter, then filter, use it together with 'perf trace', 'perf top', with or without callchains, if it explodes, please tell us! - Introduce a new callchain mode: "folded", that will list per line representations of all callchains for a give histogram entry, facilitating 'perf report' output processing by other tools, such as Brendan Gregg's flamegraph tools (Namhyung Kim) E.g: # perf report | grep -v ^# | head 18.37% 0.00% swapper [kernel.kallsyms] [k] cpu_startup_entry | ---cpu_startup_entry | |--12.07%--start_secondary | --6.30%--rest_init start_kernel x86_64_start_reservations x86_64_start_kernel # Becomes, in "folded" mode: # perf report -g folded | grep -v ^# | head -5 18.37% 0.00% swapper [kernel.kallsyms] [k] cpu_startup_entry 12.07% cpu_startup_entry;start_secondary 6.30% cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel 16.90% 0.00% swapper [kernel.kallsyms] [k] call_cpuidle 11.23% call_cpuidle;cpu_startup_entry;start_secondary 5.67% call_cpuidle;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel 16.90% 0.00% swapper [kernel.kallsyms] [k] cpuidle_enter 11.23% cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary 5.67% cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel 15.12% 0.00% swapper [kernel.kallsyms] [k] cpuidle_enter_state # The user can also select one of "count", "period" or "percent" as the first column. ... and lots of infrastructure enhancements, plus fixes and other changes, features I failed to list - see the shortlog and the git log for details" * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (271 commits) perf evlist: Add --trace-fields option to show trace fields perf record: Store data mmaps for dwarf unwind perf libdw: Check for mmaps also in MAP__VARIABLE tree perf unwind: Check for mmaps also in MAP__VARIABLE tree perf unwind: Use find_map function in access_dso_mem perf evlist: Remove perf_evlist__(enable|disable)_event functions perf evlist: Make perf_evlist__open() open evsels with their cpus and threads (like perf record does) perf report: Show random usage tip on the help line perf hists: Export a couple of hist functions perf diff: Use perf_hpp__register_sort_field interface perf tools: Add overhead/overhead_children keys defaults via string perf tools: Remove list entry from struct sort_entry perf tools: Include all tools/lib directory for tags/cscope/TAGS targets perf script: Align event name properly perf tools: Add missing headers in perf's MANIFEST perf tools: Do not show trace command if it's not compiled in perf report: Change default to use event group view perf top: Decay periods in callchains tools lib: Move bitmap.[ch] from tools/perf/ to tools/{lib,include}/ tools lib: Sync tools/lib/find_bit.c with the kernel ...
237 lines
5.4 KiB
C
237 lines
5.4 KiB
C
/*
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* Testsuite for atomic64_t functions
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*
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* Copyright © 2010 Luca Barbieri
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/bug.h>
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#include <linux/kernel.h>
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#include <linux/atomic.h>
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#ifdef CONFIG_X86
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#include <asm/processor.h> /* for boot_cpu_has below */
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#endif
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#define TEST(bit, op, c_op, val) \
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do { \
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atomic##bit##_set(&v, v0); \
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r = v0; \
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atomic##bit##_##op(val, &v); \
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r c_op val; \
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WARN(atomic##bit##_read(&v) != r, "%Lx != %Lx\n", \
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(unsigned long long)atomic##bit##_read(&v), \
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(unsigned long long)r); \
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} while (0)
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/*
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* Test for a atomic operation family,
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* @test should be a macro accepting parameters (bit, op, ...)
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*/
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#define FAMILY_TEST(test, bit, op, args...) \
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do { \
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test(bit, op, ##args); \
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test(bit, op##_acquire, ##args); \
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test(bit, op##_release, ##args); \
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test(bit, op##_relaxed, ##args); \
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} while (0)
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#define TEST_RETURN(bit, op, c_op, val) \
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do { \
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atomic##bit##_set(&v, v0); \
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r = v0; \
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r c_op val; \
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BUG_ON(atomic##bit##_##op(val, &v) != r); \
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BUG_ON(atomic##bit##_read(&v) != r); \
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} while (0)
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#define RETURN_FAMILY_TEST(bit, op, c_op, val) \
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do { \
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FAMILY_TEST(TEST_RETURN, bit, op, c_op, val); \
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} while (0)
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#define TEST_ARGS(bit, op, init, ret, expect, args...) \
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do { \
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atomic##bit##_set(&v, init); \
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BUG_ON(atomic##bit##_##op(&v, ##args) != ret); \
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BUG_ON(atomic##bit##_read(&v) != expect); \
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} while (0)
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#define XCHG_FAMILY_TEST(bit, init, new) \
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do { \
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FAMILY_TEST(TEST_ARGS, bit, xchg, init, init, new, new); \
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} while (0)
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#define CMPXCHG_FAMILY_TEST(bit, init, new, wrong) \
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do { \
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FAMILY_TEST(TEST_ARGS, bit, cmpxchg, \
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init, init, new, init, new); \
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FAMILY_TEST(TEST_ARGS, bit, cmpxchg, \
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init, init, init, wrong, new); \
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} while (0)
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#define INC_RETURN_FAMILY_TEST(bit, i) \
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do { \
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FAMILY_TEST(TEST_ARGS, bit, inc_return, \
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i, (i) + one, (i) + one); \
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} while (0)
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#define DEC_RETURN_FAMILY_TEST(bit, i) \
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do { \
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FAMILY_TEST(TEST_ARGS, bit, dec_return, \
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i, (i) - one, (i) - one); \
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} while (0)
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static __init void test_atomic(void)
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{
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int v0 = 0xaaa31337;
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int v1 = 0xdeadbeef;
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int onestwos = 0x11112222;
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int one = 1;
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atomic_t v;
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int r;
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TEST(, add, +=, onestwos);
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TEST(, add, +=, -one);
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TEST(, sub, -=, onestwos);
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TEST(, sub, -=, -one);
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TEST(, or, |=, v1);
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TEST(, and, &=, v1);
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TEST(, xor, ^=, v1);
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TEST(, andnot, &= ~, v1);
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RETURN_FAMILY_TEST(, add_return, +=, onestwos);
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RETURN_FAMILY_TEST(, add_return, +=, -one);
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RETURN_FAMILY_TEST(, sub_return, -=, onestwos);
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RETURN_FAMILY_TEST(, sub_return, -=, -one);
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INC_RETURN_FAMILY_TEST(, v0);
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DEC_RETURN_FAMILY_TEST(, v0);
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XCHG_FAMILY_TEST(, v0, v1);
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CMPXCHG_FAMILY_TEST(, v0, v1, onestwos);
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}
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#define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
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static __init void test_atomic64(void)
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{
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long long v0 = 0xaaa31337c001d00dLL;
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long long v1 = 0xdeadbeefdeafcafeLL;
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long long v2 = 0xfaceabadf00df001LL;
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long long onestwos = 0x1111111122222222LL;
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long long one = 1LL;
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atomic64_t v = ATOMIC64_INIT(v0);
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long long r = v0;
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BUG_ON(v.counter != r);
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atomic64_set(&v, v1);
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r = v1;
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BUG_ON(v.counter != r);
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BUG_ON(atomic64_read(&v) != r);
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TEST(64, add, +=, onestwos);
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TEST(64, add, +=, -one);
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TEST(64, sub, -=, onestwos);
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TEST(64, sub, -=, -one);
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TEST(64, or, |=, v1);
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TEST(64, and, &=, v1);
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TEST(64, xor, ^=, v1);
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TEST(64, andnot, &= ~, v1);
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RETURN_FAMILY_TEST(64, add_return, +=, onestwos);
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RETURN_FAMILY_TEST(64, add_return, +=, -one);
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RETURN_FAMILY_TEST(64, sub_return, -=, onestwos);
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RETURN_FAMILY_TEST(64, sub_return, -=, -one);
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INIT(v0);
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atomic64_inc(&v);
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r += one;
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BUG_ON(v.counter != r);
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INIT(v0);
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atomic64_dec(&v);
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r -= one;
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BUG_ON(v.counter != r);
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INC_RETURN_FAMILY_TEST(64, v0);
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DEC_RETURN_FAMILY_TEST(64, v0);
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XCHG_FAMILY_TEST(64, v0, v1);
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CMPXCHG_FAMILY_TEST(64, v0, v1, v2);
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INIT(v0);
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BUG_ON(atomic64_add_unless(&v, one, v0));
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BUG_ON(v.counter != r);
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INIT(v0);
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BUG_ON(!atomic64_add_unless(&v, one, v1));
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r += one;
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BUG_ON(v.counter != r);
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#ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
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INIT(onestwos);
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BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
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r -= one;
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BUG_ON(v.counter != r);
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INIT(0);
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BUG_ON(atomic64_dec_if_positive(&v) != -one);
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BUG_ON(v.counter != r);
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INIT(-one);
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BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
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BUG_ON(v.counter != r);
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#else
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#warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
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#endif
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INIT(onestwos);
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BUG_ON(!atomic64_inc_not_zero(&v));
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r += one;
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BUG_ON(v.counter != r);
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INIT(0);
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BUG_ON(atomic64_inc_not_zero(&v));
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BUG_ON(v.counter != r);
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INIT(-one);
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BUG_ON(!atomic64_inc_not_zero(&v));
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r += one;
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BUG_ON(v.counter != r);
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}
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static __init int test_atomics(void)
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{
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test_atomic();
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test_atomic64();
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#ifdef CONFIG_X86
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pr_info("passed for %s platform %s CX8 and %s SSE\n",
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#ifdef CONFIG_X86_64
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"x86-64",
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#elif defined(CONFIG_X86_CMPXCHG64)
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"i586+",
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#else
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"i386+",
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#endif
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boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
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boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
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#else
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pr_info("passed\n");
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#endif
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return 0;
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}
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core_initcall(test_atomics);
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