From c45c6ea2e5c57960dc67e00294c2b78e9540c007 Mon Sep 17 00:00:00 2001 From: Stephane Eranian Date: Fri, 28 May 2010 12:00:01 +0200 Subject: [PATCH] perf tools: Add the ability to specify list of cpus to monitor MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This patch adds a -C option to stat, record, top to designate a list of CPUs to monitor. CPUs can be specified as a comma-separated list or ranges, no space allowed. Examples: $ perf record -a -C0-1,4-7 sleep 1 $ perf top -C0-4 $ perf stat -a -C1,2,3,4 sleep 1 With perf record in per-thread mode with inherit mode on, samples are collected only when the thread runs on the designated CPUs. The -C option does not turn on system-wide mode automatically. Cc: David S. Miller Cc: Frédéric Weisbecker Cc: Ingo Molnar Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Tom Zanussi LKML-Reference: <4bff9496.d345d80a.41fe.7b00@mx.google.com> Signed-off-by: Stephane Eranian Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-record.txt | 7 +++ tools/perf/Documentation/perf-stat.txt | 7 +++ tools/perf/Documentation/perf-top.txt | 8 ++-- tools/perf/builtin-record.c | 23 ++++++---- tools/perf/builtin-stat.c | 14 ++++-- tools/perf/builtin-top.c | 16 ++++--- tools/perf/util/cpumap.c | 57 +++++++++++++++++++++++- tools/perf/util/cpumap.h | 2 +- 8 files changed, 110 insertions(+), 24 deletions(-) diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 34e255fc3e2f..25576b477c83 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -103,6 +103,13 @@ OPTIONS --raw-samples:: Collect raw sample records from all opened counters (default for tracepoint counters). +-C:: +--cpu:: +Collect samples only on the list of cpus provided. Multiple CPUs can be provided as a +comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. +In per-thread mode with inheritance mode on (default), samples are captured only when +the thread executes on the designated CPUs. Default is to monitor all CPUs. + SEE ALSO -------- linkperf:perf-stat[1], linkperf:perf-list[1] diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 909fa766fa1c..4b3a2d46b437 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -46,6 +46,13 @@ OPTIONS -B:: print large numbers with thousands' separators according to locale +-C:: +--cpu=:: +Count only on the list of cpus provided. Multiple CPUs can be provided as a +comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. +In per-thread mode, this option is ignored. The -a option is still necessary +to activate system-wide monitoring. Default is to count on all CPUs. + EXAMPLES -------- diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt index 785b9fc32a46..1f9687663f2a 100644 --- a/tools/perf/Documentation/perf-top.txt +++ b/tools/perf/Documentation/perf-top.txt @@ -25,9 +25,11 @@ OPTIONS --count=:: Event period to sample. --C :: ---CPU=:: - CPU to profile. +-C :: +--cpu=:: +Monitor only on the list of cpus provided. Multiple CPUs can be provided as a +comma-sperated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. +Default is to monitor all CPUS. -d :: --delay=:: diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index dc3435e18bde..f28c4bbd801f 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -49,7 +49,6 @@ static int group = 0; static int realtime_prio = 0; static bool raw_samples = false; static bool system_wide = false; -static int profile_cpu = -1; static pid_t target_pid = -1; static pid_t target_tid = -1; static pid_t *all_tids = NULL; @@ -74,6 +73,7 @@ static int file_new = 1; static off_t post_processing_offset; static struct perf_session *session; +static const char *cpu_list; struct mmap_data { int counter; @@ -300,7 +300,7 @@ try_again: die("Permission error - are you root?\n" "\t Consider tweaking" " /proc/sys/kernel/perf_event_paranoid.\n"); - else if (err == ENODEV && profile_cpu != -1) { + else if (err == ENODEV && cpu_list) { die("No such device - did you specify" " an out-of-range profile CPU?\n"); } @@ -622,10 +622,15 @@ static int __cmd_record(int argc, const char **argv) close(child_ready_pipe[0]); } - if ((!system_wide && no_inherit) || profile_cpu != -1) { - open_counters(profile_cpu); + nr_cpus = read_cpu_map(cpu_list); + if (nr_cpus < 1) { + perror("failed to collect number of CPUs\n"); + return -1; + } + + if (!system_wide && no_inherit && !cpu_list) { + open_counters(-1); } else { - nr_cpus = read_cpu_map(); for (i = 0; i < nr_cpus; i++) open_counters(cpumap[i]); } @@ -704,7 +709,7 @@ static int __cmd_record(int argc, const char **argv) if (perf_guest) perf_session__process_machines(session, event__synthesize_guest_os); - if (!system_wide && profile_cpu == -1) + if (!system_wide && cpu_list) event__synthesize_thread(target_tid, process_synthesized_event, session); else @@ -794,8 +799,8 @@ static const struct option options[] = { "system-wide collection from all CPUs"), OPT_BOOLEAN('A', "append", &append_file, "append to the output file to do incremental profiling"), - OPT_INTEGER('C', "profile_cpu", &profile_cpu, - "CPU to profile on"), + OPT_STRING('C', "cpu", &cpu_list, "cpu", + "list of cpus to monitor"), OPT_BOOLEAN('f', "force", &force, "overwrite existing data file (deprecated)"), OPT_U64('c', "count", &user_interval, "event period to sample"), @@ -825,7 +830,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used) argc = parse_options(argc, argv, options, record_usage, PARSE_OPT_STOP_AT_NON_OPTION); if (!argc && target_pid == -1 && target_tid == -1 && - !system_wide && profile_cpu == -1) + !system_wide && !cpu_list) usage_with_options(record_usage, options); if (force && append_file) { diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 9a39ca3c3ac4..a6b4d44f9502 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -69,7 +69,7 @@ static struct perf_event_attr default_attrs[] = { }; static bool system_wide = false; -static unsigned int nr_cpus = 0; +static int nr_cpus = 0; static int run_idx = 0; static int run_count = 1; @@ -82,6 +82,7 @@ static int thread_num = 0; static pid_t child_pid = -1; static bool null_run = false; static bool big_num = false; +static const char *cpu_list; static int *fd[MAX_NR_CPUS][MAX_COUNTERS]; @@ -158,7 +159,7 @@ static int create_perf_stat_counter(int counter) PERF_FORMAT_TOTAL_TIME_RUNNING; if (system_wide) { - unsigned int cpu; + int cpu; for (cpu = 0; cpu < nr_cpus; cpu++) { fd[cpu][counter][0] = sys_perf_event_open(attr, @@ -208,7 +209,7 @@ static inline int nsec_counter(int counter) static void read_counter(int counter) { u64 count[3], single_count[3]; - unsigned int cpu; + int cpu; size_t res, nv; int scaled; int i, thread; @@ -542,6 +543,8 @@ static const struct option options[] = { "null run - dont start any counters"), OPT_BOOLEAN('B', "big-num", &big_num, "print large numbers with thousands\' separators"), + OPT_STRING('C', "cpu", &cpu_list, "cpu", + "list of cpus to monitor in system-wide"), OPT_END() }; @@ -566,10 +569,13 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used) } if (system_wide) - nr_cpus = read_cpu_map(); + nr_cpus = read_cpu_map(cpu_list); else nr_cpus = 1; + if (nr_cpus < 1) + usage_with_options(stat_usage, options); + if (target_pid != -1) { target_tid = target_pid; thread_num = find_all_tid(target_pid, &all_tids); diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index a66f4272b994..45014ef11059 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -102,6 +102,7 @@ struct sym_entry *sym_filter_entry_sched = NULL; static int sym_pcnt_filter = 5; static int sym_counter = 0; static int display_weighted = -1; +static const char *cpu_list; /* * Symbols @@ -1351,8 +1352,8 @@ static const struct option options[] = { "profile events on existing thread id"), OPT_BOOLEAN('a', "all-cpus", &system_wide, "system-wide collection from all CPUs"), - OPT_INTEGER('C', "CPU", &profile_cpu, - "CPU to profile on"), + OPT_STRING('C', "cpu", &cpu_list, "cpu", + "list of cpus to monitor"), OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name, "file", "vmlinux pathname"), OPT_BOOLEAN('K', "hide_kernel_symbols", &hide_kernel_symbols, @@ -1428,10 +1429,10 @@ int cmd_top(int argc, const char **argv, const char *prefix __used) return -ENOMEM; /* CPU and PID are mutually exclusive */ - if (target_tid > 0 && profile_cpu != -1) { + if (target_tid > 0 && cpu_list) { printf("WARNING: PID switch overriding CPU\n"); sleep(1); - profile_cpu = -1; + cpu_list = NULL; } if (!nr_counters) @@ -1469,10 +1470,13 @@ int cmd_top(int argc, const char **argv, const char *prefix __used) attrs[counter].sample_period = default_interval; } - if (target_tid != -1 || profile_cpu != -1) + if (target_tid != -1) nr_cpus = 1; else - nr_cpus = read_cpu_map(); + nr_cpus = read_cpu_map(cpu_list); + + if (nr_cpus < 1) + usage_with_options(top_usage, options); get_term_dimensions(&winsize); if (print_entries == 0) { diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c index 4e01490e51e5..0f9b8d7a7d7e 100644 --- a/tools/perf/util/cpumap.c +++ b/tools/perf/util/cpumap.c @@ -20,7 +20,7 @@ static int default_cpu_map(void) return nr_cpus; } -int read_cpu_map(void) +static int read_all_cpu_map(void) { FILE *onlnf; int nr_cpus = 0; @@ -57,3 +57,58 @@ int read_cpu_map(void) return default_cpu_map(); } + +int read_cpu_map(const char *cpu_list) +{ + unsigned long start_cpu, end_cpu = 0; + char *p = NULL; + int i, nr_cpus = 0; + + if (!cpu_list) + return read_all_cpu_map(); + + if (!isdigit(*cpu_list)) + goto invalid; + + while (isdigit(*cpu_list)) { + p = NULL; + start_cpu = strtoul(cpu_list, &p, 0); + if (start_cpu >= INT_MAX + || (*p != '\0' && *p != ',' && *p != '-')) + goto invalid; + + if (*p == '-') { + cpu_list = ++p; + p = NULL; + end_cpu = strtoul(cpu_list, &p, 0); + + if (end_cpu >= INT_MAX || (*p != '\0' && *p != ',')) + goto invalid; + + if (end_cpu < start_cpu) + goto invalid; + } else { + end_cpu = start_cpu; + } + + for (; start_cpu <= end_cpu; start_cpu++) { + /* check for duplicates */ + for (i = 0; i < nr_cpus; i++) + if (cpumap[i] == (int)start_cpu) + goto invalid; + + assert(nr_cpus < MAX_NR_CPUS); + cpumap[nr_cpus++] = (int)start_cpu; + } + if (*p) + ++p; + + cpu_list = p; + } + if (nr_cpus > 0) + return nr_cpus; + + return default_cpu_map(); +invalid: + return -1; +} diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h index 86c78bb33098..3e60f56e490e 100644 --- a/tools/perf/util/cpumap.h +++ b/tools/perf/util/cpumap.h @@ -1,7 +1,7 @@ #ifndef __PERF_CPUMAP_H #define __PERF_CPUMAP_H -extern int read_cpu_map(void); +extern int read_cpu_map(const char *cpu_list); extern int cpumap[]; #endif /* __PERF_CPUMAP_H */ -- 2.20.1