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

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Date:	Wed, 11 Jan 2012 17:44:06 -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

On Wed, Jan 11, 2012 at 5:41 PM, Namhyung Kim <namhyung.kim@....com> wrote:
> OK, but that can be controlled from userspace, I guess? Do we have to care
> about that?

Otherwise, it's gonna be a pretty silly interface. If you want to
watch the TP, you have to restart the whole thing which also implies
intent number would change. And there still is the problem of losing
new intent events due to overflow. It just isn't the right interface
for the task.

-- 
tejun
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