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perf tools: Add the ability to specify list of cpus to monitor

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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 <davem@davemloft.net>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <4bff9496.d345d80a.41fe.7b00@mx.google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Stephane Eranian 2010-05-28 12:00:01 +02:00 • committed by Arnaldo Carvalho de Melo
parent 761844b9c6
commit c45c6ea2e5
8 changed files with 110 additions and 24 deletions
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16
tools/perf/builtin-top.c
View file

@ -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) {