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![Jason Baron](/assets/img/avatar_default.png)
If "/sys/kernel/debug" is not a debugfs mount point, search for the debugfs filesystem in /proc/mounts, but also allows the user to specify '--debugfs-dir=blah' or set the environment variable: 'PERF_DEBUGFS_DIR' Signed-off-by: Jason Baron <jbaron@redhat.com> [ also made it probe "/debug" by default ] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20090721181629.GA3094@redhat.com>
650 lines
15 KiB
C
650 lines
15 KiB
C
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#include "../perf.h"
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#include "util.h"
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#include "parse-options.h"
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#include "parse-events.h"
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#include "exec_cmd.h"
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#include "string.h"
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#include "cache.h"
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extern char *strcasestr(const char *haystack, const char *needle);
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int nr_counters;
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struct perf_counter_attr attrs[MAX_COUNTERS];
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struct event_symbol {
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u8 type;
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u64 config;
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char *symbol;
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char *alias;
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};
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char debugfs_path[MAXPATHLEN];
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#define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
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#define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
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static struct event_symbol event_symbols[] = {
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{ CHW(CPU_CYCLES), "cpu-cycles", "cycles" },
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{ CHW(INSTRUCTIONS), "instructions", "" },
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{ CHW(CACHE_REFERENCES), "cache-references", "" },
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{ CHW(CACHE_MISSES), "cache-misses", "" },
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{ CHW(BRANCH_INSTRUCTIONS), "branch-instructions", "branches" },
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{ CHW(BRANCH_MISSES), "branch-misses", "" },
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{ CHW(BUS_CYCLES), "bus-cycles", "" },
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{ CSW(CPU_CLOCK), "cpu-clock", "" },
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{ CSW(TASK_CLOCK), "task-clock", "" },
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{ CSW(PAGE_FAULTS), "page-faults", "faults" },
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{ CSW(PAGE_FAULTS_MIN), "minor-faults", "" },
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{ CSW(PAGE_FAULTS_MAJ), "major-faults", "" },
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{ CSW(CONTEXT_SWITCHES), "context-switches", "cs" },
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{ CSW(CPU_MIGRATIONS), "cpu-migrations", "migrations" },
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};
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#define __PERF_COUNTER_FIELD(config, name) \
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((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)
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#define PERF_COUNTER_RAW(config) __PERF_COUNTER_FIELD(config, RAW)
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#define PERF_COUNTER_CONFIG(config) __PERF_COUNTER_FIELD(config, CONFIG)
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#define PERF_COUNTER_TYPE(config) __PERF_COUNTER_FIELD(config, TYPE)
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#define PERF_COUNTER_ID(config) __PERF_COUNTER_FIELD(config, EVENT)
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static char *hw_event_names[] = {
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"cycles",
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"instructions",
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"cache-references",
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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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static char *sw_event_names[] = {
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"cpu-clock-msecs",
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"task-clock-msecs",
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"page-faults",
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"context-switches",
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"CPU-migrations",
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"minor-faults",
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"major-faults",
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};
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#define MAX_ALIASES 8
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static char *hw_cache[][MAX_ALIASES] = {
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{ "L1-dcache", "l1-d", "l1d", "L1-data", },
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{ "L1-icache", "l1-i", "l1i", "L1-instruction", },
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{ "LLC", "L2" },
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{ "dTLB", "d-tlb", "Data-TLB", },
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{ "iTLB", "i-tlb", "Instruction-TLB", },
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{ "branch", "branches", "bpu", "btb", "bpc", },
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};
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static char *hw_cache_op[][MAX_ALIASES] = {
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{ "load", "loads", "read", },
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{ "store", "stores", "write", },
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{ "prefetch", "prefetches", "speculative-read", "speculative-load", },
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};
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static char *hw_cache_result[][MAX_ALIASES] = {
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{ "refs", "Reference", "ops", "access", },
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{ "misses", "miss", },
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};
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#define C(x) PERF_COUNT_HW_CACHE_##x
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#define CACHE_READ (1 << C(OP_READ))
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#define CACHE_WRITE (1 << C(OP_WRITE))
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#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
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#define COP(x) (1 << x)
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/*
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* cache operartion stat
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* L1I : Read and prefetch only
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* ITLB and BPU : Read-only
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*/
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static unsigned long hw_cache_stat[C(MAX)] = {
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[C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
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[C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
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[C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
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[C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
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[C(ITLB)] = (CACHE_READ),
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[C(BPU)] = (CACHE_READ),
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};
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#define for_each_subsystem(sys_dir, sys_dirent, sys_next, file, st) \
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while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next) \
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if (snprintf(file, MAXPATHLEN, "%s/%s", debugfs_path, \
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sys_dirent.d_name) && \
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(!stat(file, &st)) && (S_ISDIR(st.st_mode)) && \
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(strcmp(sys_dirent.d_name, ".")) && \
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(strcmp(sys_dirent.d_name, "..")))
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#define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next, file, st) \
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while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next) \
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if (snprintf(file, MAXPATHLEN, "%s/%s/%s", debugfs_path, \
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sys_dirent.d_name, evt_dirent.d_name) && \
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(!stat(file, &st)) && (S_ISDIR(st.st_mode)) && \
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(strcmp(evt_dirent.d_name, ".")) && \
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(strcmp(evt_dirent.d_name, "..")))
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#define MAX_EVENT_LENGTH 30
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int valid_debugfs_mount(const char *debugfs)
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{
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struct statfs st_fs;
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if (statfs(debugfs, &st_fs) < 0)
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return -ENOENT;
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else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
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return -ENOENT;
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return 0;
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}
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static char *tracepoint_id_to_name(u64 config)
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{
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static char tracepoint_name[2 * MAX_EVENT_LENGTH];
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DIR *sys_dir, *evt_dir;
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struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
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struct stat st;
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char id_buf[4];
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int fd;
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u64 id;
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char evt_path[MAXPATHLEN];
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if (valid_debugfs_mount(debugfs_path))
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return "unkown";
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sys_dir = opendir(debugfs_path);
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if (!sys_dir)
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goto cleanup;
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for_each_subsystem(sys_dir, sys_dirent, sys_next, evt_path, st) {
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evt_dir = opendir(evt_path);
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if (!evt_dir)
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goto cleanup;
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for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next,
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evt_path, st) {
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snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id",
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debugfs_path, sys_dirent.d_name,
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evt_dirent.d_name);
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fd = open(evt_path, O_RDONLY);
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if (fd < 0)
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continue;
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if (read(fd, id_buf, sizeof(id_buf)) < 0) {
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close(fd);
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continue;
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}
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close(fd);
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id = atoll(id_buf);
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if (id == config) {
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closedir(evt_dir);
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closedir(sys_dir);
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snprintf(tracepoint_name, 2 * MAX_EVENT_LENGTH,
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"%s:%s", sys_dirent.d_name,
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evt_dirent.d_name);
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return tracepoint_name;
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}
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}
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closedir(evt_dir);
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}
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cleanup:
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closedir(sys_dir);
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return "unkown";
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}
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static int is_cache_op_valid(u8 cache_type, u8 cache_op)
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{
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if (hw_cache_stat[cache_type] & COP(cache_op))
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return 1; /* valid */
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else
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return 0; /* invalid */
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}
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static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
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{
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static char name[50];
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if (cache_result) {
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sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
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hw_cache_op[cache_op][0],
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hw_cache_result[cache_result][0]);
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} else {
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sprintf(name, "%s-%s", hw_cache[cache_type][0],
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hw_cache_op[cache_op][1]);
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}
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return name;
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}
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char *event_name(int counter)
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{
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u64 config = attrs[counter].config;
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int type = attrs[counter].type;
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static char buf[32];
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if (attrs[counter].type == PERF_TYPE_RAW) {
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sprintf(buf, "raw 0x%llx", config);
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return buf;
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}
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switch (type) {
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case PERF_TYPE_HARDWARE:
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if (config < PERF_COUNT_HW_MAX)
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return hw_event_names[config];
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return "unknown-hardware";
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case PERF_TYPE_HW_CACHE: {
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u8 cache_type, cache_op, cache_result;
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cache_type = (config >> 0) & 0xff;
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if (cache_type > PERF_COUNT_HW_CACHE_MAX)
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return "unknown-ext-hardware-cache-type";
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cache_op = (config >> 8) & 0xff;
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if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
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return "unknown-ext-hardware-cache-op";
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cache_result = (config >> 16) & 0xff;
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if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
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return "unknown-ext-hardware-cache-result";
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if (!is_cache_op_valid(cache_type, cache_op))
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return "invalid-cache";
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return event_cache_name(cache_type, cache_op, cache_result);
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}
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case PERF_TYPE_SOFTWARE:
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if (config < PERF_COUNT_SW_MAX)
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return sw_event_names[config];
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return "unknown-software";
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case PERF_TYPE_TRACEPOINT:
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return tracepoint_id_to_name(config);
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default:
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break;
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}
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return "unknown";
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}
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static int parse_aliases(const char **str, char *names[][MAX_ALIASES], int size)
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{
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int i, j;
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int n, longest = -1;
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for (i = 0; i < size; i++) {
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for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
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n = strlen(names[i][j]);
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if (n > longest && !strncasecmp(*str, names[i][j], n))
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longest = n;
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}
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if (longest > 0) {
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*str += longest;
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return i;
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}
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}
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return -1;
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}
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static int
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parse_generic_hw_event(const char **str, struct perf_counter_attr *attr)
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{
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const char *s = *str;
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int cache_type = -1, cache_op = -1, cache_result = -1;
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cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
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/*
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* No fallback - if we cannot get a clear cache type
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* then bail out:
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*/
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if (cache_type == -1)
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return 0;
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while ((cache_op == -1 || cache_result == -1) && *s == '-') {
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++s;
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if (cache_op == -1) {
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cache_op = parse_aliases(&s, hw_cache_op,
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PERF_COUNT_HW_CACHE_OP_MAX);
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if (cache_op >= 0) {
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if (!is_cache_op_valid(cache_type, cache_op))
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return 0;
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continue;
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}
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}
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if (cache_result == -1) {
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cache_result = parse_aliases(&s, hw_cache_result,
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PERF_COUNT_HW_CACHE_RESULT_MAX);
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if (cache_result >= 0)
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continue;
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}
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/*
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* Can't parse this as a cache op or result, so back up
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* to the '-'.
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*/
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--s;
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break;
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}
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/*
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* Fall back to reads:
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*/
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if (cache_op == -1)
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cache_op = PERF_COUNT_HW_CACHE_OP_READ;
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/*
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* Fall back to accesses:
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*/
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if (cache_result == -1)
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cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
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attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
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attr->type = PERF_TYPE_HW_CACHE;
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*str = s;
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return 1;
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}
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static int parse_tracepoint_event(const char **strp,
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struct perf_counter_attr *attr)
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{
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const char *evt_name;
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char sys_name[MAX_EVENT_LENGTH];
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char id_buf[4];
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int fd;
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unsigned int sys_length, evt_length;
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u64 id;
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char evt_path[MAXPATHLEN];
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if (valid_debugfs_mount(debugfs_path))
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return 0;
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evt_name = strchr(*strp, ':');
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if (!evt_name)
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return 0;
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sys_length = evt_name - *strp;
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if (sys_length >= MAX_EVENT_LENGTH)
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return 0;
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strncpy(sys_name, *strp, sys_length);
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sys_name[sys_length] = '\0';
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evt_name = evt_name + 1;
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evt_length = strlen(evt_name);
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if (evt_length >= MAX_EVENT_LENGTH)
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return 0;
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snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
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sys_name, evt_name);
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fd = open(evt_path, O_RDONLY);
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if (fd < 0)
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return 0;
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if (read(fd, id_buf, sizeof(id_buf)) < 0) {
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close(fd);
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return 0;
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}
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close(fd);
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id = atoll(id_buf);
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attr->config = id;
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attr->type = PERF_TYPE_TRACEPOINT;
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*strp = evt_name + evt_length;
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return 1;
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}
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static int check_events(const char *str, unsigned int i)
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{
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int n;
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n = strlen(event_symbols[i].symbol);
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if (!strncmp(str, event_symbols[i].symbol, n))
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return n;
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n = strlen(event_symbols[i].alias);
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if (n)
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if (!strncmp(str, event_symbols[i].alias, n))
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return n;
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return 0;
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}
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static int
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parse_symbolic_event(const char **strp, struct perf_counter_attr *attr)
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{
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const char *str = *strp;
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unsigned int i;
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int n;
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for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
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n = check_events(str, i);
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if (n > 0) {
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attr->type = event_symbols[i].type;
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attr->config = event_symbols[i].config;
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*strp = str + n;
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return 1;
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}
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}
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return 0;
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}
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static int parse_raw_event(const char **strp, struct perf_counter_attr *attr)
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{
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const char *str = *strp;
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u64 config;
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int n;
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if (*str != 'r')
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return 0;
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n = hex2u64(str + 1, &config);
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if (n > 0) {
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*strp = str + n + 1;
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attr->type = PERF_TYPE_RAW;
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attr->config = config;
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return 1;
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}
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return 0;
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}
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static int
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parse_numeric_event(const char **strp, struct perf_counter_attr *attr)
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{
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const char *str = *strp;
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char *endp;
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unsigned long type;
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u64 config;
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type = strtoul(str, &endp, 0);
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if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
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str = endp + 1;
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config = strtoul(str, &endp, 0);
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if (endp > str) {
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attr->type = type;
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attr->config = config;
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*strp = endp;
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return 1;
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}
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}
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return 0;
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}
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static int
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parse_event_modifier(const char **strp, struct perf_counter_attr *attr)
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{
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const char *str = *strp;
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int eu = 1, ek = 1, eh = 1;
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if (*str++ != ':')
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return 0;
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while (*str) {
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if (*str == 'u')
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eu = 0;
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else if (*str == 'k')
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ek = 0;
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else if (*str == 'h')
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eh = 0;
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else
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break;
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++str;
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}
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if (str >= *strp + 2) {
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*strp = str;
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attr->exclude_user = eu;
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attr->exclude_kernel = ek;
|
|
attr->exclude_hv = eh;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Each event can have multiple symbolic names.
|
|
* Symbolic names are (almost) exactly matched.
|
|
*/
|
|
static int parse_event_symbols(const char **str, struct perf_counter_attr *attr)
|
|
{
|
|
if (!(parse_tracepoint_event(str, attr) ||
|
|
parse_raw_event(str, attr) ||
|
|
parse_numeric_event(str, attr) ||
|
|
parse_symbolic_event(str, attr) ||
|
|
parse_generic_hw_event(str, attr)))
|
|
return 0;
|
|
|
|
parse_event_modifier(str, attr);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int parse_events(const struct option *opt __used, const char *str, int unset __used)
|
|
{
|
|
struct perf_counter_attr attr;
|
|
|
|
for (;;) {
|
|
if (nr_counters == MAX_COUNTERS)
|
|
return -1;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
if (!parse_event_symbols(&str, &attr))
|
|
return -1;
|
|
|
|
if (!(*str == 0 || *str == ',' || isspace(*str)))
|
|
return -1;
|
|
|
|
attrs[nr_counters] = attr;
|
|
nr_counters++;
|
|
|
|
if (*str == 0)
|
|
break;
|
|
if (*str == ',')
|
|
++str;
|
|
while (isspace(*str))
|
|
++str;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char * const event_type_descriptors[] = {
|
|
"",
|
|
"Hardware event",
|
|
"Software event",
|
|
"Tracepoint event",
|
|
"Hardware cache event",
|
|
};
|
|
|
|
/*
|
|
* Print the events from <debugfs_mount_point>/tracing/events
|
|
*/
|
|
|
|
static void print_tracepoint_events(void)
|
|
{
|
|
DIR *sys_dir, *evt_dir;
|
|
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
|
|
struct stat st;
|
|
char evt_path[MAXPATHLEN];
|
|
|
|
if (valid_debugfs_mount(debugfs_path))
|
|
return;
|
|
|
|
sys_dir = opendir(debugfs_path);
|
|
if (!sys_dir)
|
|
goto cleanup;
|
|
|
|
for_each_subsystem(sys_dir, sys_dirent, sys_next, evt_path, st) {
|
|
evt_dir = opendir(evt_path);
|
|
if (!evt_dir)
|
|
goto cleanup;
|
|
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next,
|
|
evt_path, st) {
|
|
snprintf(evt_path, MAXPATHLEN, "%s:%s",
|
|
sys_dirent.d_name, evt_dirent.d_name);
|
|
fprintf(stderr, " %-40s [%s]\n", evt_path,
|
|
event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
|
|
}
|
|
closedir(evt_dir);
|
|
}
|
|
|
|
cleanup:
|
|
closedir(sys_dir);
|
|
}
|
|
|
|
/*
|
|
* Print the help text for the event symbols:
|
|
*/
|
|
void print_events(void)
|
|
{
|
|
struct event_symbol *syms = event_symbols;
|
|
unsigned int i, type, op, prev_type = -1;
|
|
char name[40];
|
|
|
|
fprintf(stderr, "\n");
|
|
fprintf(stderr, "List of pre-defined events (to be used in -e):\n");
|
|
|
|
for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
|
|
type = syms->type + 1;
|
|
if (type >= ARRAY_SIZE(event_type_descriptors))
|
|
type = 0;
|
|
|
|
if (type != prev_type)
|
|
fprintf(stderr, "\n");
|
|
|
|
if (strlen(syms->alias))
|
|
sprintf(name, "%s OR %s", syms->symbol, syms->alias);
|
|
else
|
|
strcpy(name, syms->symbol);
|
|
fprintf(stderr, " %-40s [%s]\n", name,
|
|
event_type_descriptors[type]);
|
|
|
|
prev_type = type;
|
|
}
|
|
|
|
fprintf(stderr, "\n");
|
|
for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
|
|
for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
|
|
/* skip invalid cache type */
|
|
if (!is_cache_op_valid(type, op))
|
|
continue;
|
|
|
|
for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
|
|
fprintf(stderr, " %-40s [%s]\n",
|
|
event_cache_name(type, op, i),
|
|
event_type_descriptors[4]);
|
|
}
|
|
}
|
|
}
|
|
|
|
fprintf(stderr, "\n");
|
|
fprintf(stderr, " %-40s [raw hardware event descriptor]\n",
|
|
"rNNN");
|
|
fprintf(stderr, "\n");
|
|
|
|
print_tracepoint_events();
|
|
|
|
exit(129);
|
|
}
|