linux-kernel - Re: [PATCH 1/3] Add a new field to struct shrinker

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Date:	Mon, 11 Jul 2016 16:33:42 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Rik van Riel <riel@...riel.com>
Cc:	Janani Ravichandran <janani.rvchndrn@...il.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, hannes@...xchg.org,
	vdavydov@...tuozzo.com, vbabka@...e.cz,
	mgorman@...hsingularity.net, kirill.shutemov@...ux.intel.com,
	bywxiaobai@....com
Subject: Re: [PATCH 1/3] Add a new field to struct shrinker

On Mon 11-07-16 10:12:51, Rik van Riel wrote:
> On Mon, 2016-07-11 at 08:37 +0200, Michal Hocko wrote:
> > On Sat 09-07-16 04:43:31, Janani Ravichandran wrote:
> > > Struct shrinker does not have a field to uniquely identify the
> > > shrinkers
> > > it represents. It would be helpful to have a new field to hold
> > > names of
> > > shrinkers. This information would be useful while analyzing their
> > > behavior using tracepoints.
> > 
> > This will however increase the vmlinux size even when no tracing is
> > enabled. Why cannot we simply print the name of the shrinker
> > callbacks?
> 
> What mechanism do you have in mind for obtaining the name,
> Michal?

Not sure whether tracing infrastructure allows printk like %ps. If not
then it doesn't sound too hard to add.
-- 
Michal Hocko
SUSE Labs