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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-12-12 15:59:51 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-12-16 13:38:26 -0300 |
| commit | e5d4a290da5366c397653c47c3e869a67b1bfa07 (patch) | |
| tree | f2eed90be88587d084cfecdfbbb3bf748dbdf52b /tools | |
| parent | perf evlist: Fixup brown paper bag on "hint" for --mmap-pages cmdline arg (diff) | |
| download | linux-dev-e5d4a290da5366c397653c47c3e869a67b1bfa07.tar.xz linux-dev-e5d4a290da5366c397653c47c3e869a67b1bfa07.zip | |
perf evlist: Clarify sterror_mmap variable names
Prep patch for doing further checks like when the number of pages that
is being attempted is actually below /proc/sys/kernel/perf_event_mlock_kb but
the operation fails because the user doesn't have CAP_IPC_LOCK.
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-wetzlux7mzvofu5cuji5i71i@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/evlist.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index de7515dd683a..d661f252b891 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1487,16 +1487,16 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused, 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; + int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user; switch (err) { case EPERM: - sysctl__read_int("kernel/perf_event_mlock_kb", &value); + sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user); 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 smaller -m/--mmap-pages value.", - emsg, value, evlist->mmap_len / 1024); + emsg, pages_max_per_user, pages_attempted); break; default: scnprintf(buf, size, "%s", emsg); |