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

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Message-ID: <20160711063730.GA5284@dhcp22.suse.cz>
Date:	Mon, 11 Jul 2016 08:37:31 +0200
From:	Michal Hocko <mhocko@...nel.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@...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 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?

> 
> ---
>  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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-- 
Michal Hocko
SUSE Labs