linux-kernel - Re: [PATCH 1/1 linux-next RESEND] task IO accounting: add conditional read/write counters

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Date:	Tue, 3 Mar 2015 14:04:33 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/1 linux-next RESEND] task IO accounting: add
 conditional read/write counters

On Tue,  3 Mar 2015 21:16:35 +0100 Fabian Frederick <fabf@...net.be> wrote:

> This patch adds syscre and syscwe respectively effective read/write
> syscall counters. We already had syscr/syscw which were
> unconditionally incremented. Doing the difference between those
> variables could give interesting statistics.

I don't think that "could give interesting statistics" is sufficient
justification for adding overhead and extending the Linux userspace
interface.

More specificity would help, including real-worldish use cases which
demonstrate the value.
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