From: Rik van Riel <riel@redhat.com>
To: Michel Lespinasse <walken@google.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Tao Ma <tm@tao.ma>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Hugh Dickins <hughd@google.com>
Subject: Re: [PATCH] mlock: operate on any regions with protection != PROT_NONE
Date: Tue, 01 Feb 2011 12:57:30 -0500 [thread overview]
Message-ID: <4D48498A.9040606@redhat.com> (raw)
In-Reply-To: <20110201010341.GA21676@google.com>
On 01/31/2011 08:03 PM, Michel Lespinasse wrote:
> As Tao Ma noticed, change 5ecfda0 breaks blktrace. This is because
> blktrace mmaps a file with PROT_WRITE permissions but without PROT_READ,
> so my attempt to not unnecessarity break COW during mlock ended up
> causing mlock to fail with a permission problem.
>
> I am proposing to let mlock ignore vma protection in all cases except
> PROT_NONE. In particular, mlock should not fail for PROT_WRITE regions
> (as in the blktrace case, which broke at 5ecfda0) or for PROT_EXEC
> regions (which seem to me like they were always broken).
>
> Please review. I am proposing this as a candidate for 2.6.38 inclusion,
> because of the behavior change with blktrace.
Acked-by: Rik van Riel <riel@redhat.com>
--
All rights reversed
--
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/ .
Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-02-01 17:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-01 1:03 [PATCH] mlock: operate on any regions with protection != PROT_NONE Michel Lespinasse
2011-02-01 1:08 ` Michel Lespinasse
2011-02-01 5:59 ` Linus Torvalds
2011-02-01 6:36 ` Michel Lespinasse
2011-02-01 17:57 ` Rik van Riel
2011-02-01 17:57 ` Rik van Riel [this message]
2011-02-03 0:57 ` KOSAKI Motohiro
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=4D48498A.9040606@redhat.com \
--to=riel@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=hughd@google.com \
--cc=kosaki.motohiro@jp.fujitsu.com \
--cc=linux-mm@kvack.org \
--cc=tm@tao.ma \
--cc=torvalds@linux-foundation.org \
--cc=walken@google.com \
/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).