From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f51.google.com (mail-qg0-f51.google.com [209.85.192.51]) by kanga.kvack.org (Postfix) with ESMTP id 7C0A36B0253 for ; Fri, 28 Aug 2015 14:43:01 -0400 (EDT) Received: by qgeb6 with SMTP id b6so34539831qge.3 for ; Fri, 28 Aug 2015 11:43:01 -0700 (PDT) Received: from prod-mail-xrelay05.akamai.com ([23.79.238.179]) by mx.google.com with ESMTP id 3si8126663qhx.74.2015.08.28.11.42.59 for ; Fri, 28 Aug 2015 11:42:59 -0700 (PDT) From: Eric B Munson Subject: [PATCH] mremap.2: Add note about mremap with locked areas Date: Fri, 28 Aug 2015 14:42:52 -0400 Message-Id: <1440787372-30214-1-git-send-email-emunson@akamai.com> Sender: owner-linux-mm@kvack.org List-ID: To: mtk.manpages@gmail.com Cc: Eric B Munson , Michal Hocko , David Rientjes , linux-man@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org 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 Cc: Michal Hocko Cc: David Rientjes 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org