Commit a1ac1d3c authored by Stephane Eranian's avatar Stephane Eranian Committed by Arnaldo Carvalho de Melo
Browse files

perf record: Add option to avoid updating buildid cache 



There are situations where there is enough information in the perf.data
to process the samples. Updating the buildid cache may add unecessary
overhead in terms of disk space and time (copying large elf images).

A persistent option to do this already exists via the perfconfig file,
simply do:

[buildid]
dir = /dev/null

This patch provides a way to suppress builid cache updates on a per-run
basis.  It addds a new option, -N, to perf record. Buildids are still
generated in the perf.data file.

Cc: David S. Miller <davem@davemloft.net>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4c19ef89.93ecd80a.40dc.fffff8e9@mx.google.com>
Signed-off-by: default avatarStephane Eranian <eranian@google.com>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 70c3856b

tools/perf/Documentation/perf-record.txt

+6 −0
Original line number Diff line number Diff line
@@ -110,6 +110,12 @@ 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.



-N::

--no-buildid-cache::

Do not update the builid cache. This saves some overhead in situations

where the information in the perf.data file (which includes buildids)

is sufficient.



SEE ALSO

--------

linkperf:perf-stat[1], linkperf:perf-list[1]

tools/perf/builtin-record.c

+5 −0
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ static bool call_graph = false; 
static bool			inherit_stat			=  false;

static bool			no_samples			=  false;

static bool			sample_address			=  false;

static bool			no_buildid			=  false;



static long			samples				=      0;

static u64			bytes_written			=      0;
@@ -825,6 +826,8 @@ static const struct option options[] = { 
		    "Sample addresses"),

	OPT_BOOLEAN('n', "no-samples", &no_samples,

		    "don't sample"),

	OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid,

		    "do not update the buildid cache"),

	OPT_END()

};
@@ -849,6 +852,8 @@ int cmd_record(int argc, const char **argv, const char *prefix __used) 
	}



	symbol__init();

	if (no_buildid)

		disable_buildid_cache();



	if (!nr_counters) {

		nr_counters	= 1;

tools/perf/util/header.c

+9 −1
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 
#include "symbol.h"

#include "debug.h"



static bool no_buildid_cache = false;



/*

 * Create new perf.data header attribute:

 */
@@ -470,6 +472,7 @@ static int perf_header__adds_write(struct perf_header *self, int fd) 
		}

		buildid_sec->size = lseek(fd, 0, SEEK_CUR) -

					  buildid_sec->offset;

		if (!no_buildid_cache)

			perf_session__cache_build_ids(session);

	}
@@ -1189,3 +1192,8 @@ int event__process_build_id(event_t *self, 
				 session);

	return 0;

}



void disable_buildid_cache(void)

{

	no_buildid_cache = true;

}

tools/perf/util/util.h

+1 −0
Original line number Diff line number Diff line
@@ -154,6 +154,7 @@ extern void set_die_routine(void (*routine)(const char *err, va_list params) NOR 


extern int prefixcmp(const char *str, const char *prefix);

extern void set_buildid_dir(void);

extern void disable_buildid_cache(void);



static inline const char *skip_prefix(const char *str, const char *prefix)

{

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