From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael Kerrisk (man-pages)" Subject: Re: [PATCH] mremap.2: Add note about mremap with locked areas Date: Fri, 11 Sep 2015 13:47:42 +0200 Message-ID: <55F2BF5E.2000505@gmail.com> References: <1440787372-30214-1-git-send-email-emunson@akamai.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1440787372-30214-1-git-send-email-emunson-JqFfY2XvxFXQT0dZR+AlfA@public.gmane.org> Sender: linux-man-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Eric B Munson Cc: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, Michal Hocko , David Rientjes , linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-man@vger.kernel.org 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 > Cc: Michal Hocko > Cc: David Rientjes > Cc: linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > Cc: linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org > Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.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/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html