From: Arjan van de Ven <arjan@linux.intel.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [Announce] Development release 0.1 of the LatencyTOP tool
Date: Fri, 18 Jan 2008 21:34:55 -0800 [thread overview]
Message-ID: <47918BFF.9010804@linux.intel.com> (raw)
In-Reply-To: <20080119053330.GB28467@one.firstfloor.org>
Andi Kleen wrote:
>> another thing that the current profiling can't do, is to show what the
>> system is doing
>> when it hits the latency.. so someone calling fsync() will show up in the
>> waiting for
>> IO function, but not that it was due to an fsync().
>
> Hmm so how about extending oprofile to always log the syscall number
> in the event logs (can be gotten from top of stack).
syscall nr and pid at minimum then.
Still doesn't work for modules either.
what it ends up doing is using an entirely different interface for basically the
same code / operation inside the kernel.
The current interface code is maybe 80 lines of /proc code... and very simple to
use (unlike the oprofile interface)
next prev parent reply other threads:[~2008-01-19 5:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-18 17:36 [Announce] Development release 0.1 of the LatencyTOP tool Arjan van de Ven
2008-01-18 17:39 ` [patch 1/3] LatencyTOP infrastructure patch Arjan van de Ven
2008-01-20 11:34 ` Helge Deller
2008-01-20 16:47 ` Dmitry Adamushko
2008-01-20 17:18 ` Dmitry Adamushko
2008-01-21 8:06 ` KOSAKI Motohiro
2008-01-21 16:16 ` Arjan van de Ven
2008-01-18 17:40 ` [patch 2/3] Latencytop instrumentations part 1 Arjan van de Ven
2008-01-18 22:26 ` Frank Ch. Eigler
2008-01-18 22:33 ` Arjan van de Ven
2008-01-18 22:47 ` Arnaldo Carvalho de Melo
2008-01-18 23:11 ` Frank Ch. Eigler
2008-01-18 23:20 ` Arjan van de Ven
2008-01-18 17:42 ` [patch 3/3] LatencyTOP instrumentations part 2 Arjan van de Ven
2008-01-18 18:27 ` [Announce] Development release 0.1 of the LatencyTOP tool Roberto Fichera
2008-01-18 18:35 ` Arjan van de Ven
2008-01-18 18:46 ` Roberto Fichera
2008-01-18 19:02 ` Zan Lynx
2008-01-19 5:07 ` Andi Kleen
2008-01-19 5:16 ` Arjan van de Ven
2008-01-19 5:27 ` Andi Kleen
2008-01-19 5:25 ` Arjan van de Ven
2008-01-19 5:33 ` Andi Kleen
2008-01-19 5:34 ` Arjan van de Ven [this message]
2008-01-19 6:08 ` Andi Kleen
2008-01-19 5:37 ` [Announce] Development release 0.1 of the LatencyTOP tool II Andi Kleen
2008-01-21 0:52 ` Development release 0.1 of the LatencyTOP tool KOSAKI Motohiro
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