linux-kernel - Re: scheduler / perf stat question about CPU-migrations

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: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4DFA1D07.1050705@draigBrady.com>
Date:	Thu, 16 Jun 2011 16:11:03 +0100
From:	Pádraig Brady <P@...igBrady.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Theodore Ts'o <tytso@....edu>, linux-kernel@...r.kernel.org
Subject: Re: scheduler / perf stat question about CPU-migrations

On 16/06/11 16:03, Frederic Weisbecker wrote:
> On Thu, Jun 16, 2011 at 10:46:26AM -0400, Theodore Ts'o wrote:
>> Can someone tell me how I'm being confused?
>>
>> I ran the following command as root:
>>
>> 	perf stat schedtool -a 1 -e e2fsck -ft /dev/funarg/kbuild
> 
> A theory is that schedtool does:
> 
> if (!fork()) {
> 	set affinity there
> 	launch e2fsck
> }

Well `taskset` and `chrt` from util-linux don't fork at least,
so you could try those instead.

I also suggest protecting the command with --
in case perf is not stopping at the first unrecognized option.

cheers,
Pádraig.
--
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/