From: Mel Gorman <mgorman-l3A5Bk7waGM@public.gmane.org>
To: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>
Cc: Michael Kerrisk
<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
Jeff Moyer <jmoyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH] Describe race of direct read and fork for unaligned buffers
Date: Mon, 30 Apr 2012 15:30:04 +0100 [thread overview]
Message-ID: <20120430143004.GP9226@suse.de> (raw)
In-Reply-To: <1335778207-6511-1-git-send-email-jack-AlSwsSmVLrQ@public.gmane.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 <jmoyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> Signed-off-by: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>
Acked-by: Mel Gorman <mgorman-l3A5Bk7waGM@public.gmane.org>
--
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
next prev parent reply other threads:[~2012-04-30 14:30 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-30 9:30 [PATCH] Describe race of direct read and fork for unaligned buffers Jan Kara
2012-04-30 13:41 ` Jeff Moyer
[not found] ` <1335778207-6511-1-git-send-email-jack-AlSwsSmVLrQ@public.gmane.org>
2012-04-30 14:30 ` Mel Gorman [this message]
2012-05-01 5:50 ` Michael Kerrisk (man-pages)
2012-05-01 6:49 ` Nick Piggin
2012-05-01 14:31 ` KOSAKI Motohiro
[not found] ` <CAHGf_=qdE3yNw=htuRssfav2pECO1Q0+gWMRTuNROd_3tVrd6Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-01 14:37 ` KOSAKI Motohiro
2012-05-01 15:11 ` Jeff Moyer
[not found] ` <x49ehr4lyw1.fsf-RRHT56Q3PSP4kTEheFKJxxDDeQx5vsVwAInAS/Ez/D0@public.gmane.org>
2012-05-01 15:34 ` KOSAKI Motohiro
2012-05-01 15:38 ` Jeff Moyer
[not found] ` <x491un3nc7a.fsf-RRHT56Q3PSP4kTEheFKJxxDDeQx5vsVwAInAS/Ez/D0@public.gmane.org>
2012-05-01 15:50 ` Nick Piggin
2012-05-01 23:51 ` Andrea Arcangeli
[not found] ` <CAPa8GCCgLUt1EDAy7-O-mo0qir6Bf5Pi3Va1EsQ3ZW5UU=+37g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-02 8:17 ` Jan Kara
[not found] ` <20120502081705.GB16976-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-05-02 9:09 ` Nick Piggin
2012-05-02 9:18 ` Jan Kara
[not found] ` <20120502091837.GC16976-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-05-02 19:14 ` KOSAKI Motohiro
2012-05-02 19:23 ` Jan Kara
[not found] ` <20120502192325.GA18339-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-05-02 19:25 ` KOSAKI Motohiro
[not found] ` <CAHGf_=oOx1qPFEboQeuaeMKtveM2==BSDG=xdfRHz+gFx1GAfw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-05 11:28 ` Michael Kerrisk (man-pages)
2012-05-05 15:29 ` KOSAKI Motohiro
2012-05-08 23:10 ` Nick Piggin
2012-05-09 5:35 ` Michael Kerrisk (man-pages)
2012-05-09 7:01 ` Nick Piggin
2012-05-09 7:18 ` Michael Kerrisk (man-pages)
2012-05-10 15:00 ` Jan Kara
2012-05-01 16:15 ` KOSAKI Motohiro
2012-05-01 17:56 ` Michael Kerrisk (man-pages)
2012-05-02 0:34 ` Nick Piggin
2012-05-02 3:04 ` Hugh Dickins
[not found] ` <alpine.LSU.2.00.1205011952040.1293-fupSdm12i1nKWymIFiNcPA@public.gmane.org>
2012-05-02 3:10 ` Nick Piggin
2012-05-02 9:20 ` Jan Kara
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120430143004.GP9226@suse.de \
--to=mgorman-l3a5bk7wagm@public.gmane.org \
--cc=jack-AlSwsSmVLrQ@public.gmane.org \
--cc=jmoyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org \
--cc=mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).