linux-kernel - [tip:perf/urgent] perf tools: Make the mmap length autotuning more robust

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Message-ID: <tip-6p6l5ou6jev6o7ymc4nn1n2a@git.kernel.org>
Date:	Wed, 17 Dec 2014 22:32:26 -0800
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	namhyung@...nel.org, hpa@...or.com, mingo@...nel.org,
	linux-kernel@...r.kernel.org, dzickus@...hat.com, acme@...hat.com,
	efault@....de, bp@...e.de, adrian.hunter@...el.com,
	paulus@...ba.org, peterz@...radead.org, jolsa@...hat.com,
	dsahern@...il.com, eranian@...gle.com, tglx@...utronix.de,
	fweisbec@...il.com
Subject: [tip:perf/urgent] perf tools:
  Make the mmap length autotuning more robust

Commit-ID:  1be300f4cc1ddf975f158b4ab2f880854b29306b
Gitweb:     http://git.kernel.org/tip/1be300f4cc1ddf975f158b4ab2f880854b29306b
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 16 Dec 2014 12:19:00 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 17 Dec 2014 11:58:14 -0300

perf tools: Make the mmap length autotuning more robust

If /proc/sys/kernel/perf_event_mlock_kb is not (power of 2 + PAGE_SIZE_in_kb)
and we let the perf tools do mmap length autosizing based on that, then, for
non-CAP_IPC_LOCK users when /proc/sys/kernel/perf_event_paranoid is > -1, then
we get an -EINVAL that ends up in:

  [acme@...andy linux]$ trace usleep 1
  Invalid argument
  [acme@...andy linux]$ perf record usleep 1
  failed to mmap with 22 (Invalid argument)

After this fix:

  [acme@...andy linux]$ trace usleep 1
  <SNIP>
   0.806 ( 0.006 ms): munmap(addr: 0x7f7e4740a000, len: 66467) = 0
   0.869 ( 0.002 ms): brk(                                   ) = 0x7bb000
   0.873 ( 0.003 ms): brk(brk: 0x7dc000                      ) = 0x7dc000
   0.877 ( 0.001 ms): brk(                                   ) = 0x7dc000
   0.953 ( 0.058 ms): nanosleep(rqtp: 0x7fff26ab9420         ) = 0
   0.959 ( 0.000 ms): exit_group(
  [acme@...andy linux]$ perf record usleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.017 MB perf.data (~759 samples) ]
  [acme@...andy linux]$

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-6p6l5ou6jev6o7ymc4nn1n2a@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 8eb92cf..7d88327 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -909,6 +909,8 @@ static size_t perf_evlist__mmap_size(unsigned long pages)
 		}
 
 		pages = (max * 1024) / page_size;
+		if (!is_power_of_2(pages))
+			pages = rounddown_pow_of_two(pages);
 	} else if (!is_power_of_2(pages))
 		return 0;
 
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