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Commit 956fa571 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf evlist: Introduce strerror_mmap method 

To pretty print hints about perf_evlist__mmap errors. Will be used in
'trace' in the next patch.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-2g3gczfwyz0xt3we0s15mqqt@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent ce27309f

tools/perf/util/evlist.c

+23 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 */

#include "util.h"

#include <api/fs/debugfs.h>

#include <api/fs/fs.h>

#include <poll.h>

#include "cpumap.h"

#include "thread_map.h"
@@ -1483,6 +1484,28 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, 
	return 0;

}



int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)

{

	char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf));

	int value;



	switch (err) {

	case EPERM:

		sysctl__read_int("kernel/perf_event_mlock_kb", &value);

		scnprintf(buf, size, "Error:\t%s.\n"

				     "Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"

				     "Hint:\tTried using %zd kB.\n"

				     "Hint:\tTry using a bigger -m/--mmap-pages value.",

				     emsg, value, evlist->mmap_len / 1024);

		break;

	default:

		scnprintf(buf, size, "%s", emsg);

		break;

	}



	return 0;

}



void perf_evlist__to_front(struct perf_evlist *evlist,

			   struct perf_evsel *move_evsel)

{

tools/perf/util/evlist.h

+1 −0
Original line number Diff line number Diff line
@@ -185,6 +185,7 @@ size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp); 


int perf_evlist__strerror_tp(struct perf_evlist *evlist, int err, char *buf, size_t size);

int perf_evlist__strerror_open(struct perf_evlist *evlist, int err, char *buf, size_t size);

int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size);



static inline unsigned int perf_mmap__read_head(struct perf_mmap *mm)

{