linux-kernel - Re: [PATCH 2/2] mm: compaction.c: Add/Modify direct compaction tracepoints

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Message-ID: <20160727112411.6e60c186@gandalf.local.home>
Date:	Wed, 27 Jul 2016 11:24:11 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Janani Ravichandran <janani.rvchndrn@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org, riel@...riel.com,
	akpm@...ux-foundation.org, hannes@...pxchg.org,
	vdavydov@...tuozzo.com, mhocko@...e.com, vbabka@...e.cz,
	mgorman@...hsingularity.net, kirill.shutemov@...ux.intel.com,
	bywxiaobai@....com
Subject: Re: [PATCH 2/2] mm: compaction.c: Add/Modify direct compaction
 tracepoints

On Wed, 27 Jul 2016 10:51:03 -0400
Janani Ravichandran <janani.rvchndrn@...il.com> wrote:

> Add zone information to an existing tracepoint in compact_zone(). Also,
> add a new tracepoint at the end of the compaction code so that latency 
> information can be derived.
> 
> Signed-off-by: Janani Ravichandran <janani.rvchndrn@...il.com>
> ---

>  
> +	trace_mm_compaction_try_to_compact_pages_end(rc, *contended);
> +

Again, I'm not to thrilled about tracepoints just being added to track
the length of function calls. We have function graph tracer for that.

-- Steve


>  	return rc;
>  }
>