linux-kernel - [tip:perf/urgent] perf evlist: Clarify sterror

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Message-ID: <tip-wetzlux7mzvofu5cuji5i71i@git.kernel.org>
Date:	Wed, 17 Dec 2014 22:28:24 -0800
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, acme@...hat.com, tglx@...utronix.de,
	adrian.hunter@...el.com, mingo@...nel.org, bp@...e.de,
	namhyung@...nel.org, eranian@...gle.com, peterz@...radead.org,
	fweisbec@...il.com, efault@....de, jolsa@...hat.com,
	dsahern@...il.com, linux-kernel@...r.kernel.org,
	dzickus@...hat.com, paulus@...ba.org
Subject: [tip:perf/urgent] perf evlist:
  Clarify sterror_mmap variable names

Commit-ID:  e5d4a290da5366c397653c47c3e869a67b1bfa07
Gitweb:     http://git.kernel.org/tip/e5d4a290da5366c397653c47c3e869a67b1bfa07
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Fri, 12 Dec 2014 15:59:51 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.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@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-wetzlux7mzvofu5cuji5i71i@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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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