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

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Date:	Mon, 11 Jul 2016 10:12:51 -0400
From:	Rik van Riel <riel@...riel.com>
To:	Michal Hocko <mhocko@...nel.org>,
	Janani Ravichandran <janani.rvchndrn@...il.com>
Cc:	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, 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?

> > ---
> >  include/linux/shrinker.h | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
> > index 4fcacd9..431125c 100644
> > --- a/include/linux/shrinker.h
> > +++ b/include/linux/shrinker.h
> > @@ -52,6 +52,7 @@ struct shrinker {
> >  	unsigned long (*scan_objects)(struct shrinker *,
> >  				      struct shrink_control *sc);
> >  
> > +	const char *name;
> >  	int seeks;	/* seeks to recreate an obj */
> >  	long batch;	/* reclaim batch size, 0 = default */
> >  	unsigned long flags;
> > -- 
> > 2.7.0
> > 
> > --
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> 
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