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Commit 1a47245d authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add perf_event_paranoid() 



Add a function to return the value of
/proc/sys/kernel/perf_event_paranoid.

This will be used to determine default values for mmap size because perf
is not subject to mmap limits when perf_event_paranoid is less than
zero.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1386765443-26966-12-git-send-email-alexander.shishkin@linux.intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent c506c96b

tools/perf/util/evlist.c

+1 −2
Original line number Diff line number Diff line
@@ -1191,8 +1191,7 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, 
				    "Error:\t%s.\n"

				    "Hint:\tCheck /proc/sys/kernel/perf_event_paranoid setting.", emsg);



		if (filename__read_int("/proc/sys/kernel/perf_event_paranoid", &value))

			break;

		value = perf_event_paranoid();



		printed += scnprintf(buf + printed, size - printed, "\nHint:\t");

tools/perf/util/util.c

+19 −0
Original line number Diff line number Diff line 
#include "../perf.h"

#include "util.h"

#include "fs.h"

#include <sys/mman.h>

#ifdef HAVE_BACKTRACE_SUPPORT

#include <execinfo.h>
@@ -8,6 +9,7 @@ 
#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <limits.h>

#include <linux/kernel.h>



/*
@@ -496,3 +498,20 @@ const char *get_filename_for_perf_kvm(void) 


	return filename;

}



int perf_event_paranoid(void)

{

	char path[PATH_MAX];

	const char *procfs = procfs__mountpoint();

	int value;



	if (!procfs)

		return INT_MAX;



	scnprintf(path, PATH_MAX, "%s/sys/kernel/perf_event_paranoid", procfs);



	if (filename__read_int(path, &value))

		return INT_MAX;



	return value;

}

tools/perf/util/util.h

+1 −0
Original line number Diff line number Diff line
@@ -321,6 +321,7 @@ void free_srcline(char *srcline); 


int filename__read_int(const char *filename, int *value);

int filename__read_str(const char *filename, char **buf, size_t *sizep);

int perf_event_paranoid(void);



const char *get_filename_for_perf_kvm(void);

#endif /* GIT_COMPAT_UTIL_H */