Messages in this thread | | | Date | Mon, 31 Aug 2015 11:14:03 +0200 | From | Michal Hocko <> | Subject | Re: [PATCH] mremap.2: Add note about mremap with locked areas |
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On Fri 28-08-15 14:42:52, 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. > > Signed-off-by: Eric B Munson <emunson@akamai.com> > Cc: Michal Hocko <mhocko@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Thank you for following on this.
> Cc: David Rientjes <rientjes@google.com> > Cc: linux-man@vger.kernel.org > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.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), > -- > 1.9.1
-- Michal Hocko SUSE Labs
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