From: David Ahern <daahern@cisco.com>
To: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
tzanussi@gmail.com, Paul Mackerras <paulus@samba.org>,
imunsie@au1.ibm.com, linux-kernel@vger.kernel.org,
linux-perf-users@vger.kernel.org
Subject: Re: perf: commit 55b4462 causes perf record to hang
Date: Mon, 10 Jan 2011 13:07:35 -0700 [thread overview]
Message-ID: <4D2B6707.3070908@cisco.com> (raw)
In-Reply-To: <20110110200032.GA19703@ghostprotocols.net>
On 01/10/11 13:00, Arnaldo Carvalho de Melo wrote:
> Em Mon, Jan 10, 2011 at 11:47:43AM -0700, David Ahern escreveu:
>> With latest version of perf-core branch, a variant of perf record hangs:
>> # /tmp/build-perf/perf record -v -e cs -fo /tmp/perf.data -- sleep 1
>> [ perf record: Captured and wrote 0.003 MB /tmp/perf.data (~120 samples) ]
>>
>> It sits there forever. Back trace is:
>>
>> (gdb) bt
>> #0 0x0000000000447658 in __perf_session__process_events (session=0xab9500, data_offset=208, data_size=2896, file_size=3104, ops=0x685580) at util/session.c:1006
>> #1 0x00000000004107dd in process_buildids () at builtin-record.c:466
>> #2 0x000000000041084d in atexit_header () at builtin-record.c:477
>
>> git bisect traced the hang to
>>
>> commit 55b44629f599a2305265ae9c77f9d9bcfd6ddc17
>> Author: Thomas Gleixner <tglx@linutronix.de>
>> Date: Tue Nov 30 17:49:46 2010 +0000
>
> Can you try with this patch, not reverting tglx's patch?
>
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 6fb4694..313dac2 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1007,7 +1007,7 @@ more:
> if (size == 0)
> size = 8;
>
> - if (head + event->header.size >= mmap_size) {
> + if (head + event->header.size > mmap_size) {
> if (mmaps[map_idx]) {
> munmap(mmaps[map_idx], mmap_size);
> mmaps[map_idx] = NULL;
That does the trick -- perf-record exits fine.
David
> --
> To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2011-01-10 20:07 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-10 18:47 perf: commit 55b4462 causes perf record to hang David Ahern
2011-01-10 19:40 ` Arnaldo Carvalho de Melo
2011-01-10 20:00 ` Arnaldo Carvalho de Melo
2011-01-10 20:07 ` David Ahern [this message]
2011-01-11 8:28 ` Thomas Gleixner
2011-01-11 11:35 ` Arnaldo Carvalho de Melo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4D2B6707.3070908@cisco.com \
--to=daahern@cisco.com \
--cc=acme@ghostprotocols.net \
--cc=imunsie@au1.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-perf-users@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=paulus@samba.org \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
--cc=tzanussi@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).