From: Rik van Riel <riel@conectiva.com.br>
To: Chris Wedgwood <cw@f00f.org>
Cc: "David S. Miller" <davem@redhat.com>,
David Howells <dhowells@redhat.com>,
Rasmus Andersen <rasmus@jaquet.dk>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] guard mm->rss with page_table_lock (241p11)
Date: Tue, 30 Jan 2001 09:23:27 -0200 (BRDT) [thread overview]
Message-ID: <Pine.LNX.4.21.0101300921480.1321-100000@duckman.distro.conectiva> (raw)
In-Reply-To: <20010131001737.C6620@metastasis.f00f.org>
On Wed, 31 Jan 2001, Chris Wedgwood wrote:
> On Tue, Jan 30, 2001 at 12:39:24AM -0800, David S. Miller wrote:
>
> Please see older threads about this, it has been discussed to
> death already (hint: sizeof(atomic_t), sizeof(unsigned long)).
>
> can we not define a macro so architectures that can do do atomically
> inc/dec with unsigned long will? otherwise it uses the spinlock?
Why bother ?
In most places where we update mm->rss, we are *already*
holding the spinlock anyway, this correction is just for
a few places.
The big patch Rasmus made seems to contain spin_lock(&foo)
in places where we already have the lock, leading to
instant SMP deadlock. I suspect Rasmus' patch should be
about half the size it is currently...
regards,
Rik
--
Virtual memory is like a game you can't win;
However, without VM there's truly nothing to lose...
http://www.surriel.com/
http://www.conectiva.com/ http://distro.conectiva.com.br/
--
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.eu.org/Linux-MM/
next prev parent reply other threads:[~2001-01-30 11:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-29 21:23 Rasmus Andersen
2001-01-29 21:30 ` Rik van Riel
2001-01-29 21:43 ` Rasmus Andersen
2001-01-29 21:47 ` Rik van Riel
2001-01-30 8:18 ` David Howells
2001-01-30 8:31 ` Rasmus Andersen
2001-01-30 14:32 ` Mark Hahn
2001-01-30 15:30 ` Eric W. Biederman
2001-01-30 8:39 ` David S. Miller
2001-01-30 11:17 ` Chris Wedgwood
2001-01-30 11:23 ` Rik van Riel [this message]
2001-01-30 11:38 ` Rasmus Andersen
2001-02-13 3:15 ` george anzinger
2001-02-13 2:05 ` Marcelo Tosatti
2001-02-13 10:08 ` Stephen C. Tweedie
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=Pine.LNX.4.21.0101300921480.1321-100000@duckman.distro.conectiva \
--to=riel@conectiva.com.br \
--cc=cw@f00f.org \
--cc=davem@redhat.com \
--cc=dhowells@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=rasmus@jaquet.dk \
/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