From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mel Gorman Subject: Re: [PATCH] Describe race of direct read and fork for unaligned buffers Date: Mon, 30 Apr 2012 15:30:04 +0100 Message-ID: <20120430143004.GP9226@suse.de> References: <1335778207-6511-1-git-send-email-jack@suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Return-path: Content-Disposition: inline In-Reply-To: <1335778207-6511-1-git-send-email-jack-AlSwsSmVLrQ@public.gmane.org> Sender: linux-man-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jan Kara Cc: Michael Kerrisk , LKML , linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, Jeff Moyer List-Id: linux-man@vger.kernel.org On Mon, Apr 30, 2012 at 11:30:07AM +0200, Jan Kara wrote: > This is a long standing problem (or a surprising feature) in our implementation > of get_user_pages() (used by direct IO). Since several attempts to fix it > failed (e.g. > http://linux.derkeiler.com/Mailing-Lists/Kernel/2009-04/msg06542.html, or > http://lkml.indiana.edu/hypermail/linux/kernel/0903.1/01498.html refused in > http://comments.gmane.org/gmane.linux.kernel.mm/31569) and it's not completely > clear whether we really want to fix it given the costs, let's at least document > it. > > CC: mgorman-l3A5Bk7waGM@public.gmane.org > CC: Jeff Moyer > Signed-off-by: Jan Kara Acked-by: Mel Gorman -- Mel Gorman SUSE Labs -- 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