Messages in this thread Patch in this message | | | Date | Wed, 17 Dec 2014 22:28:24 -0800 | From | tip-bot for Arnaldo Carvalho de Melo <> | Subject | [tip:perf/urgent] perf evlist: Clarify sterror_mmap variable names |
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Commit-ID: e5d4a290da5366c397653c47c3e869a67b1bfa07 Gitweb: http://git.kernel.org/tip/e5d4a290da5366c397653c47c3e869a67b1bfa07 Author: Arnaldo Carvalho de Melo <acme@redhat.com> AuthorDate: Fri, 12 Dec 2014 15:59:51 -0300 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Tue, 16 Dec 2014 13:38:26 -0300
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> --- tools/perf/util/evlist.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index de7515d..d661f25 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);
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