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Commit e09b18d4 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf trace: Provide a better explanation when mmap fails 

If we ask for a mmap lenght than the max configured via the relevant
sysctl, provide a better warning, instead of just expanding the EPERM
returned:

[acme@ssdandy ~]$ trace -m 256 -e nanosleep sleep 2
Error:	Operation not permitted.
Hint:	Check /proc/sys/kernel/perf_event_mlock_kb (516 kB) setting.
Hint:	Tried using 1028 kB.
Hint:	Try using a bigger -m/--mmap-pages value.

[acme@ssdandy ~]$ trace -m 128 -e nanosleep sleep 2
  2001.280 (2000.403 ms): nanosleep(rqtp: 0x7fff89a8a7f0) = 0
[acme@ssdandy ~]$

An upcoming patch will autotune the request for non-root users when -m
is not used.

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-cdvxfz2gycetbkopm9sna1qp@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 956fa571

tools/perf/builtin-trace.c

+6 −6
Original line number Diff line number Diff line
@@ -2045,7 +2045,6 @@ static int trace__run(struct trace *trace, int argc, const char **argv) 
	unsigned long before;

	const bool forks = argc > 0;

	bool draining = false;

	char sbuf[STRERR_BUFSIZE];



	trace->live = true;
@@ -2106,11 +2105,8 @@ static int trace__run(struct trace *trace, int argc, const char **argv) 
		goto out_error_open;



	err = perf_evlist__mmap(evlist, trace->opts.mmap_pages, false);

	if (err < 0) {

		fprintf(trace->output, "Couldn't mmap the events: %s\n",

			strerror_r(errno, sbuf, sizeof(sbuf)));

		goto out_delete_evlist;

	}

	if (err < 0)

		goto out_error_mmap;



	perf_evlist__enable(evlist);
@@ -2210,6 +2206,10 @@ static int trace__run(struct trace *trace, int argc, const char **argv) 
	perf_evlist__strerror_tp(evlist, errno, errbuf, sizeof(errbuf));

	goto out_error;



out_error_mmap:

	perf_evlist__strerror_mmap(evlist, errno, errbuf, sizeof(errbuf));

	goto out_error;



out_error_open:

	perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));