lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <4F99BCAF.1080309@gmail.com>
Date:	Thu, 26 Apr 2012 15:22:55 -0600
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...il.com>
CC:	Namhyung Kim <namhyung.kim@....com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/13] perf evlist: Fix creation of cpu map

On 4/26/12 3:12 PM, Namhyung Kim wrote:
> Hmm.. No, I can reproduce it without any of this series. And now I think
> that it is not related to the number of cpus. On my 4 core (no
> hyperthreading) machine at home, the result was same.
>
> BTW, did you change sysctl settings?
>
>    $ cat /sys/devices/system/cpu/online
>    0-3
>    $ grep . /proc/sys/kernel/perf_event_*
>    /proc/sys/kernel/perf_event_max_sample_rate:100000
>    /proc/sys/kernel/perf_event_mlock_kb:516
>    /proc/sys/kernel/perf_event_paranoid:1

$ grep . /proc/sys/kernel/perf_event_*
/proc/sys/kernel/perf_event_max_sample_rate:100000
/proc/sys/kernel/perf_event_mlock_kb:516
/proc/sys/kernel/perf_event_paranoid:-1

That last one is the key. I have it set to not paranoid and usually run 
perf a non-root user.

>    $ ./perf test 7
>     7: Validate PERF_RECORD_* events&  perf_sample fields: FAILED!
>    $ ./perf --version
>    perf version 3.4.rc1

running 3.4-rc4 kernel + perf from tip/perf/core branch.

David
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ