linux-kernel - Re: [Announce] Development release 0.1 of the LatencyTOP tool

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Date:	Sat, 19 Jan 2008 06:33:30 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Announce] Development release 0.1 of the LatencyTOP tool

> 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). I think given
that you could reconstruct that data in the userland at least
for single threads (not for work done on behalf of them in other
threads; but I'm not sure you tried to solve that problem at all)

The advantage is that it would be an generic mechanism that would work
for all types of profiling.

-Andi
> 
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