linux-kernel - Re: [PATCH v17 1/7] mm: support madvise(MADV

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Message-ID: <20141205083249.GA2321@dhcp22.suse.cz>
Date:	Fri, 5 Dec 2014 09:32:49 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-api@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Jason Evans <je@...com>,
	zhangyanfei@...fujitsu.com,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v17 1/7] mm: support madvise(MADV_FREE)

On Fri 05-12-14 16:08:16, Minchan Kim wrote:
[...]
> From cfa212d4fb307ae772b08cf564cab7e6adb8f4fc Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@...nel.org>
> Date: Mon, 1 Dec 2014 08:53:55 +0900
> Subject: [PATCH] madvise.2: Document MADV_FREE
> 
> Signed-off-by: Minchan Kim <minchan@...nel.org>

Reviewed-by: Michal Hocko <mhocko@...e.cz>

Thanks!

> ---
>  man2/madvise.2 | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/man2/madvise.2 b/man2/madvise.2
> index 032ead7..fc1aaca 100644
> --- a/man2/madvise.2
> +++ b/man2/madvise.2
> @@ -265,6 +265,18 @@ file (see
>  .BR MADV_DODUMP " (since Linux 3.4)"
>  Undo the effect of an earlier
>  .BR MADV_DONTDUMP .
> +.TP
> +.BR MADV_FREE " (since Linux 3.19)"
> +Tell the kernel that contents in the specified address range are no
> +longer important and the range will be overwritten. When there is
> +demand for memory, the system will free pages associated with the
> +specified address range. In this instance, the next time a page in the
> +address range is referenced, it will contain all zeroes.  Otherwise,
> +it will contain the data that was there prior to the MADV_FREE call.
> +References made to the address range will not make the system read
> +from backing store (swap space) until the page is modified again.
> +It works only with private anonymous pages (see
> +.BR mmap (2)).
>  .SH RETURN VALUE
>  On success
>  .BR madvise ()
> -- 
> 2.0.0
> 
> -- 
> Kind regards,
> Minchan Kim
> --
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-- 
Michal Hocko
SUSE Labs
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