linux-kernel - Re: [PATCH v2 3/4] mm, shmem: Add shmem resident memory accounting

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Message-ID: <55158EB5.5040301@yandex-team.ru>
Date:	Fri, 27 Mar 2015 20:09:09 +0300
From:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	Jerome Marchand <jmarchan@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-doc@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-s390@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] mm, shmem: Add shmem resident memory accounting

On 27.03.2015 19:40, Vlastimil Babka wrote:
> From: Jerome Marchand <jmarchan@...hat.com>
>
> Currently looking at /proc/<pid>/status or statm, there is no way to
> distinguish shmem pages from pages mapped to a regular file (shmem
> pages are mapped to /dev/zero), even though their implication in
> actual memory use is quite different.
> This patch adds MM_SHMEMPAGES counter to mm_rss_stat to account for
> shmem pages instead of MM_FILEPAGES.
>
> Signed-off-by: Jerome Marchand <jmarchan@...hat.com>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> ---


> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -327,9 +327,12 @@ struct core_state {
>   };
>
>   enum {
> -	MM_FILEPAGES,
> -	MM_ANONPAGES,
> -	MM_SWAPENTS,
> +	MM_FILEPAGES,	/* Resident file mapping pages */
> +	MM_ANONPAGES,	/* Resident anonymous pages */
> +	MM_SWAPENTS,	/* Anonymous swap entries */
> +#ifdef CONFIG_SHMEM
> +	MM_SHMEMPAGES,	/* Resident shared memory pages */
> +#endif

I prefer to keep that counter unconditionally:
kernel has MM_SWAPENTS even without CONFIG_SWAP.

>   	NR_MM_COUNTERS
>   };
>
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