full-disclosure - Re: "IO wait chains" in Linux??

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Date: Tue, 8 Feb 2011 00:38:41 +0000
From: "Cal Leeming [Simplicity Media Ltd]"
	<cal.leeming@...plicitymedialtd.co.uk>
To: coderman <coderman@...il.com>, Valdis.Kletnieks@...edu, 
	full-disclosure@...ts.grok.org.uk
Subject: Re: "IO wait chains" in Linux??

Hmm, I'd never heard of any of those before, I'll check them out.

Haven't really got an end goal, it's more of a learning curve trying to
teach myself some of the fundamentals about how the kernel works, and
sharing what I find.

That, and IO wait / deadlocking was the bane of my existence for the entire
of 2010 whilst attempting to try out technologies such as DRBD, XFS, OCFS2
in a HA environment :/

On Mon, Feb 7, 2011 at 11:19 PM, coderman <coderman@...il.com> wrote:

> On Mon, Feb 7, 2011 at 12:06 PM,  <Valdis.Kletnieks@...edu> wrote:
> > ...
> > So the big question is "what you're trying to accomplish" rather than "is
> there
> > a CLI tool that does XYZ" - most of the problems won't be found by
> checking for
> > XYZ at all...
>
> he may want more kernel land visibility, in which case kernel
> profiling, oprofile, kprobes are what you seek.
>

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