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perf report/annotate/script: Add option to specify a CPU range

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Add an option to perf report/annotate/script to specify which
CPUs to operate on. This enables us to take a single system wide
profile and analyse each CPU (or group of CPUs) in isolation.

This was useful when profiling a multiprocess workload where the
bottleneck was on one CPU but this was hidden in the overall
profile. Per process and per thread breakdowns didn't help
because multiple processes were running on each CPU and no
single process consumed an entire CPU.

The patch converts the list of CPUs returned by cpu_map__new
into a bitmap for fast lookup. I wanted to use -C to be
consistent with perf top/record/stat, but unfortunately perf
report already uses -C <comms>.

 v2: Incorporate suggestions from David Ahern:
	- Added -c to perf script
	- Check that SAMPLE_CPU is set when -c is used
	- Update documentation

 v3: Create perf_session__cpu_bitmap()

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Link: http://lkml.kernel.org/r/20110704215750.11647eb9@kryten
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Anton Blanchard 2011-07-04 21:57:50 +10:00 • committed by Ingo Molnar
parent 9f8b6a6cf0
commit 5d67be97f8
8 changed files with 102 additions and 0 deletions
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13
tools/perf/builtin-script.c
View file

@ -13,6 +13,7 @@
#include "util/util.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include <linux/bitmap.h>
static char const *script_name;
static char const *generate_script_lang;
@ -21,6 +22,8 @@ static u64 last_timestamp;
static u64 nr_unordered;
extern const struct option record_options[];
static bool no_callchain;
static const char *cpu_list;
static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
enum perf_output_field {
PERF_OUTPUT_COMM = 1U << 0,
@ -453,6 +456,10 @@ static int process_sample_event(union perf_event *event,
last_timestamp = sample->time;
return 0;
}
if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
return 0;
scripting_ops->process_event(event, sample, evsel, session, thread);
session->hists.stats.total_period += sample->period;
@ -1075,6 +1082,7 @@ static const struct option options[] = {
OPT_CALLBACK('f', "fields", NULL, "str",
"comma separated output fields prepend with 'type:'. Valid types: hw,sw,trace,raw. Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,addr",
parse_output_fields),
OPT_STRING('c', "cpu", &cpu_list, "cpu", "list of cpus to profile"),
OPT_END()
};
@ -1255,6 +1263,11 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)
if (session == NULL)
return -ENOMEM;
if (cpu_list) {
if (perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap))
return -1;
}
if (!no_callchain)
symbol_conf.use_callchain = true;
else