linux-kernel - Re: [PATCH RESEND 9/9] block, trace: implement ioblame

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Message-ID: <CAOS58YPk4uf=nZrFF2PJGpwV2f+zO+m8g-YVDfWr5siaHAm=Ng@mail.gmail.com>
Date:	Wed, 11 Jan 2012 18:24:08 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Namhyung Kim <namhyung.kim@....com>
Cc:	Namhyung Kim <namhyung@...il.com>, axboe@...nel.dk,
	mingo@...hat.com, rostedt@...dmis.org, fweisbec@...il.com,
	teravest@...gle.com, slavapestov@...gle.com, ctalbott@...gle.com,
	dhsharp@...gle.com, linux-kernel@...r.kernel.org,
	winget@...gle.com, Chanho Park <chanho61.park@...sung.com>
Subject: Re: [PATCH RESEND 9/9] block, trace: implement ioblame - IO tracer
 with origin tracking

Hello,

On Wed, Jan 11, 2012 at 6:19 PM, Namhyung Kim <namhyung.kim@....com> wrote:
> I understood it's unreliable. BTW I think that sane userland tool must start
> both of ioblame_io and ioblame_create_intent, say, TPs at once - prior to
> triggering ioblame/enable, obviously. The ioblame/intents can be used as a
> backup just in case.

So, regardless of create_intent TP, the tool has to have code to read
ioblame/intents, right? I just don't see what the benefit of having an
extra interface which can't even be used by itself would be.

Thanks.

-- 
tejun
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