From: Andrew Morton <akpm@linux-foundation.org>
To: miaox@cn.fujitsu.com
Cc: David Rientjes <rientjes@google.com>,
Lee Schermerhorn <lee.schermerhorn@hp.com>,
Nick Piggin <npiggin@suse.de>, Paul Menage <menage@google.com>,
Linux-Kernel <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>
Subject: Re: [PATCH -mm] cpuset,mm: fix no node to alloc memory when changing cpuset's mems - fix2
Date: Wed, 12 May 2010 00:32:46 -0400 [thread overview]
Message-ID: <20100512003246.9f0ee03c.akpm@linux-foundation.org> (raw)
In-Reply-To: <4BEA56D3.6040705@cn.fujitsu.com>
On Wed, 12 May 2010 15:20:51 +0800 Miao Xie <miaox@cn.fujitsu.com> wrote:
> @@ -985,6 +984,7 @@ repeat:
> * for the read-side.
> */
> while (ACCESS_ONCE(tsk->mems_allowed_change_disable)) {
> + task_unlock(tsk);
> if (!task_curr(tsk))
> yield();
> goto repeat;
Oh, I meant to mention that. No yield()s, please. Their duration is
highly unpredictable. Can we do something more deterministic here?
Did you consider doing all this with locking? get_mems_allowed() does
mutex_lock(current->lock)?
--
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:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-05-12 7:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-12 7:20 [PATCH -mm] cpuset,mm: fix no node to alloc memory when changing cpuset's mems - fix2 Miao Xie
2010-05-12 4:32 ` Andrew Morton [this message]
2010-05-12 9:00 ` Miao Xie
2010-05-12 17:48 ` Andrew Morton
2010-05-13 6:16 ` Miao Xie
2010-05-13 19:11 ` Andrew Morton
2010-05-17 4:01 ` Miao Xie
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=20100512003246.9f0ee03c.akpm@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=lee.schermerhorn@hp.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=menage@google.com \
--cc=miaox@cn.fujitsu.com \
--cc=npiggin@suse.de \
--cc=rientjes@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).