From: David Miller <davem@davemloft.net>
To: eranian@gmail.com, eranian@googlemail.com
Cc: andi@firstfloor.org, tglx@linutronix.de,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
mingo@elte.hu, x86@kernel.org, sfr@canb.auug.org.au
Subject: Re: [patch 05/24] perfmon: X86 generic code (x86)
Date: Thu, 27 Nov 2008 03:42:47 -0800 (PST) [thread overview]
Message-ID: <20081127.034247.72331360.davem@davemloft.net> (raw)
In-Reply-To: <7c86c4470811270335p2dbd61ebpe2c584e32d8b2292@mail.gmail.com>
From: "stephane eranian" <eranian@googlemail.com>
Date: Thu, 27 Nov 2008 12:35:54 +0100
> I am still wondering how Oprofile handles the case where multiple
> processes or threads access the same file descriptor.
There's only one profiling buffer active on a given cpu,
so it's pure per-cpu value insertion.
In any event I think that NMI profiling is a must, especially
for the kernel. You get total unusable crap otherwise. I
just learned this the hard way having gotten an NMI'ish scheme
working on sparc64 just the other day.
next prev parent reply other threads:[~2008-11-27 11:42 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-26 8:42 [patch 05/24] perfmon: X86 generic code (x86) eranian
2008-11-26 11:33 ` Andi Kleen
2008-11-26 12:05 ` Stephen Rothwell
2008-11-26 12:22 ` Andi Kleen
2008-11-26 12:48 ` Stephen Rothwell
2008-11-26 13:32 ` Thomas Gleixner
2008-11-26 13:56 ` stephane eranian
2008-11-26 16:38 ` Thomas Gleixner
2008-11-27 9:51 ` stephane eranian
2008-11-27 10:56 ` Thomas Gleixner
2008-11-27 11:37 ` David Miller
2008-11-27 14:40 ` Thomas Gleixner
2008-11-26 13:35 ` Thomas Gleixner
2008-11-26 14:00 ` Andi Kleen
2008-11-26 21:18 ` Thomas Gleixner
2008-11-26 21:37 ` stephane eranian
2008-11-26 23:16 ` Thomas Gleixner
2008-11-27 9:38 ` stephane eranian
2008-11-26 22:54 ` Thomas Gleixner
2008-11-27 10:06 ` Andi Kleen
2008-11-27 10:09 ` stephane eranian
2008-11-27 10:29 ` Thomas Gleixner
2008-11-27 11:31 ` Andi Kleen
2008-11-27 11:35 ` stephane eranian
2008-11-27 11:42 ` David Miller [this message]
2008-11-27 11:49 ` Thomas Gleixner
2008-11-27 12:38 ` Andi Kleen
2008-11-27 12:31 ` stephane eranian
2008-11-27 12:46 ` Andi Kleen
2008-11-27 13:32 ` Thomas Gleixner
2008-11-27 13:37 ` stephane eranian
2008-11-27 13:51 ` Andi Kleen
2008-11-27 13:50 ` Andi Kleen
2008-11-27 11:52 ` Peter Zijlstra
2008-11-27 12:04 ` stephane eranian
2008-11-27 12:16 ` Peter Zijlstra
2008-11-27 12:32 ` Andi Kleen
2008-11-27 12:28 ` stephane eranian
2008-11-27 12:45 ` Andi Kleen
2008-11-27 13:30 ` stephane eranian
2008-11-27 13:49 ` Andi Kleen
2008-11-27 13:47 ` stephane eranian
-- strict thread matches above, loose matches on Subject: below --
2008-11-25 21:36 eranian
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