Re: [PATCH v17 1/7] mm: support madvise(MADV_FREE)
From: Michal Hocko
Date: Fri Dec 05 2014 - 03:33:16 EST
On Fri 05-12-14 16:08:16, Minchan Kim wrote:
> From cfa212d4fb307ae772b08cf564cab7e6adb8f4fc Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@xxxxxxxxxx>
> Date: Mon, 1 Dec 2014 08:53:55 +0900
> Subject: [PATCH] madvise.2: Document MADV_FREE
> Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
> 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 .
> +.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 ()
> Kind regards,
> Minchan Kim
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