From: Dave McCracken <dmccr@us.ibm.com>
To: Andrew Morton <akpm@digeo.com>
Cc: mika.penttila@kolumbus.fi, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: Race between vmtruncate and mapped areas?
Date: Wed, 14 May 2003 13:05:56 -0500 [thread overview]
Message-ID: <99000000.1052935556@baldur.austin.ibm.com> (raw)
In-Reply-To: <20030514105706.628fba15.akpm@digeo.com>
--On Wednesday, May 14, 2003 10:57:06 -0700 Andrew Morton <akpm@digeo.com>
wrote:
> yes. It's a very complex way of allocating anonymous memory.
Yep. And randomly, at that.
> I am told that Stephen, Linus and others discussed this at length at KS a
> couple of years ago and the upshot was that the application is racy anyway
> and there's nothing wrong with it.
>
> Hugh calls these "Morton pages" but it wasn't me and nobody saw me do it.
>
> It would be nice to make them go away - they cause problems.
Definitely. We almost have the pieces necessary to detect it and/or
prevent it, but the info isn't in quite the right layer at the right time.
If it weren't for the lock order problem with mmap_sem we could have nailed
it that way. Sigh.
Dave
======================================================================
Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059
dmccr@us.ibm.com T/L 678-3059
WARNING: multiple messages have this Message-ID (diff)
From: Dave McCracken <dmccr@us.ibm.com>
To: Andrew Morton <akpm@digeo.com>
Cc: mika.penttila@kolumbus.fi, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: Race between vmtruncate and mapped areas?
Date: Wed, 14 May 2003 13:05:56 -0500 [thread overview]
Message-ID: <99000000.1052935556@baldur.austin.ibm.com> (raw)
In-Reply-To: <20030514105706.628fba15.akpm@digeo.com>
--On Wednesday, May 14, 2003 10:57:06 -0700 Andrew Morton <akpm@digeo.com>
wrote:
> yes. It's a very complex way of allocating anonymous memory.
Yep. And randomly, at that.
> I am told that Stephen, Linus and others discussed this at length at KS a
> couple of years ago and the upshot was that the application is racy anyway
> and there's nothing wrong with it.
>
> Hugh calls these "Morton pages" but it wasn't me and nobody saw me do it.
>
> It would be nice to make them go away - they cause problems.
Definitely. We almost have the pieces necessary to detect it and/or
prevent it, but the info isn't in quite the right layer at the right time.
If it weren't for the lock order problem with mmap_sem we could have nailed
it that way. Sigh.
Dave
======================================================================
Dave McCracken IBM Linux Base Kernel Team 1-512-838-3059
dmccr@us.ibm.com T/L 678-3059
--
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: <a href=mailto:"aart@kvack.org"> aart@kvack.org </a>
next prev parent reply other threads:[~2003-05-14 17:53 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-13 20:44 Race between vmtruncate and mapped areas? Dave McCracken
2003-05-13 20:44 ` Dave McCracken
2003-05-13 20:58 ` Mika Penttilä
2003-05-13 20:58 ` Mika Penttilä
2003-05-13 21:04 ` William Lee Irwin III
2003-05-13 21:04 ` William Lee Irwin III
2003-05-13 22:26 ` Dave McCracken
2003-05-13 22:26 ` Dave McCracken
2003-05-13 22:49 ` William Lee Irwin III
2003-05-13 22:49 ` William Lee Irwin III
2003-05-13 23:00 ` Dave McCracken
2003-05-13 23:11 ` William Lee Irwin III
2003-05-13 23:11 ` William Lee Irwin III
2003-05-13 23:16 ` Dave McCracken
2003-05-13 23:16 ` Dave McCracken
2003-05-13 23:20 ` William Lee Irwin III
2003-05-13 23:20 ` William Lee Irwin III
2003-05-13 23:28 ` Dave McCracken
2003-05-13 23:28 ` Dave McCracken
2003-05-13 23:29 ` William Lee Irwin III
2003-05-13 23:29 ` William Lee Irwin III
2003-05-13 23:16 ` William Lee Irwin III
2003-05-13 23:16 ` William Lee Irwin III
2003-05-14 1:10 ` Andrew Morton
2003-05-14 1:10 ` Andrew Morton
2003-05-14 15:02 ` Dave McCracken
2003-05-14 15:02 ` Dave McCracken
2003-05-14 1:10 ` Andrew Morton
2003-05-14 1:10 ` Andrew Morton
2003-05-14 15:02 ` Dave McCracken
2003-05-14 15:02 ` Dave McCracken
2003-05-14 15:06 ` William Lee Irwin III
2003-05-14 15:06 ` William Lee Irwin III
2003-05-14 15:25 ` Dave McCracken
2003-05-14 15:25 ` Dave McCracken
2003-05-14 16:42 ` Gerrit Huizenga
2003-05-14 16:42 ` Gerrit Huizenga
2003-05-14 17:34 ` Andrew Morton
2003-05-14 17:34 ` Andrew Morton
2003-05-14 17:42 ` Dave McCracken
2003-05-14 17:42 ` Dave McCracken
2003-05-14 17:57 ` Andrew Morton
2003-05-14 17:57 ` Andrew Morton
2003-05-14 18:05 ` Dave McCracken [this message]
2003-05-14 18:05 ` Dave McCracken
2003-05-14 18:17 ` Andrew Morton
2003-05-14 18:17 ` Andrew Morton
2003-05-14 18:24 ` Dave McCracken
2003-05-14 18:24 ` Dave McCracken
2003-05-14 18:53 ` Andrew Morton
2003-05-14 18:53 ` Andrew Morton
2003-05-15 8:50 ` Andrea Arcangeli
2003-05-15 8:50 ` Andrea Arcangeli
2003-05-14 19:02 ` Rik van Riel
2003-05-14 19:02 ` Rik van Riel
2003-05-14 19:04 ` Rik van Riel
2003-05-14 19:04 ` Rik van Riel
2003-05-14 19:07 ` Dave McCracken
2003-05-14 19:07 ` Dave McCracken
2003-05-14 19:11 ` Rik van Riel
2003-05-14 19:11 ` Rik van Riel
2003-05-15 0:49 ` Andrea Arcangeli
2003-05-15 0:49 ` Andrea Arcangeli
2003-05-15 2:36 ` Rik van Riel
2003-05-15 2:36 ` Rik van Riel
2003-05-15 9:46 ` Andrea Arcangeli
2003-05-15 9:46 ` Andrea Arcangeli
2003-05-15 9:55 ` Andrew Morton
2003-05-15 9:55 ` Andrew Morton
2003-05-15 8:32 ` Andrew Morton
2003-05-15 8:32 ` Andrew Morton
2003-05-15 8:42 ` Andrew Morton
2003-05-15 8:42 ` Andrew Morton
2003-05-15 8:55 ` Andrea Arcangeli
2003-05-15 8:55 ` Andrea Arcangeli
2003-05-15 9:20 ` Andrew Morton
2003-05-15 9:20 ` Andrew Morton
2003-05-15 9:40 ` Andrea Arcangeli
2003-05-15 9:40 ` Andrea Arcangeli
2003-05-15 9:58 ` Andrew Morton
2003-05-15 9:58 ` Andrew Morton
2003-05-15 16:38 ` Daniel McNeil
2003-05-15 19:19 ` Andrea Arcangeli
2003-05-15 19:19 ` Andrea Arcangeli
2003-05-15 22:04 ` Daniel McNeil
2003-05-15 22:04 ` Daniel McNeil
2003-05-15 23:17 ` Andrea Arcangeli
2003-05-15 23:17 ` Andrea Arcangeli
2003-05-17 0:27 ` Daniel McNeil
2003-05-17 0:27 ` Daniel McNeil
2003-05-17 17:29 ` Andrea Arcangeli
2003-05-17 17:29 ` Andrea Arcangeli
2003-05-13 21:00 ` William Lee Irwin III
2003-05-13 21:00 ` William Lee Irwin III
-- strict thread matches above, loose matches on Subject: below --
2003-05-17 18:19 Paul McKenney
2003-05-17 18:19 ` Paul McKenney
2003-05-17 18:42 ` Andrea Arcangeli
2003-05-17 18:42 ` Andrea Arcangeli
2003-05-19 18:11 Paul McKenney
2003-05-19 18:11 ` Paul McKenney
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=99000000.1052935556@baldur.austin.ibm.com \
--to=dmccr@us.ibm.com \
--cc=akpm@digeo.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mika.penttila@kolumbus.fi \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.