linux-kernel - Re: [PATCH] mremap.2: Add note about mremap with locked areas

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Message-ID: <55F2BF5E.2000505@gmail.com>
Date:	Fri, 11 Sep 2015 13:47:42 +0200
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Eric B Munson <emunson@...mai.com>
CC:	mtk.manpages@...il.com, Michal Hocko <mhocko@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	linux-man@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mremap.2: Add note about mremap with locked areas

On 08/28/2015 08:42 PM, Eric B Munson wrote:
> When mremap() is used to move or expand a mapping that is locked with
> mlock() or equivalent it will attempt to populate the new area.
> However, like mmap(MAP_LOCKED), mremap() will not fail if the area
> cannot be populated.  Also like mmap(MAP_LOCKED) this might come as a
> surprise to users and should be noted.

Thanks, Eric! 

Applied, with Michael's Acked-by added.

Cheers,

Michael


> Signed-off-by: Eric B Munson <emunson@...mai.com>
> Cc: Michal Hocko <mhocko@...e.cz>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: linux-man@...r.kernel.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  man2/mremap.2 | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/man2/mremap.2 b/man2/mremap.2
> index 071adb5..cf884e6 100644
> --- a/man2/mremap.2
> +++ b/man2/mremap.2
> @@ -196,6 +196,17 @@ and the prototype for
>  did not allow for the
>  .I new_address
>  argument.
> +
> +If
> +.BR mremap ()
> +is used to move or expand an area locked with
> +.BR mlock (2)
> +or equivalent, the
> +.BR mremap ()
> +call will make a best effort to populate the new area but will not fail
> +with
> +.B ENOMEM
> +if the area cannot be populated.
>  .SH SEE ALSO
>  .BR brk (2),
>  .BR getpagesize (2),
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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