linux-kernel - Re: [PATCH 1/2] perf, x86-mm: Add exit-fault tracing

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Message-ID: <20161027083802.GG3568@worktop.programming.kicks-ass.net>
Date:   Thu, 27 Oct 2016 10:38:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Alexis Berlemont <alexis.berlemont@...il.com>,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com
Subject: Re: [PATCH 1/2] perf, x86-mm: Add exit-fault tracing

On Wed, Oct 26, 2016 at 04:53:39PM -0200, Arnaldo Carvalho de Melo wrote:
> Em Wed, Oct 26, 2016 at 10:51:16AM +0200, Peter Zijlstra escreveu:
> > On Wed, Oct 26, 2016 at 01:51:59AM +0200, Alexis Berlemont wrote:
> > 
> > -ENOCHANGELOG
> 
> Yeah, please add one explaining why we want this, how we can use it, for
> example, in 'perf trace', to measure how long each page fault took,
> examples of it in use, etc.

Note that 'to measure page-fault duration' is not a reason, its a what.
This needs a proper reason.