From: Dave Chinner <david@fromorbit.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] vmscan: fix initial shrinker size handling
Date: Tue, 23 Aug 2011 09:28:34 +1000 [thread overview]
Message-ID: <20110822232834.GV3162@dastard> (raw)
In-Reply-To: <20110822143006.60f4b560.akpm@linux-foundation.org>
On Mon, Aug 22, 2011 at 02:30:06PM -0700, Andrew Morton wrote:
> On Mon, 22 Aug 2011 14:17:21 +0300
> Konstantin Khlebnikov <khlebnikov@openvz.org> wrote:
>
> > Shrinker function can returns -1, it means it cannot do anything without a risk of deadlock.
> > For example prune_super() do this if it cannot grab superblock refrence, even if nr_to_scan=0.
> > Currenly we interpret this like ULONG_MAX size shrinker, evaluate total_scan according this,
> > and next time this shrinker can get really big pressure. Let's skip such shrinkers instead.
>
> Yes, that looks like a significant oversight.
>
> > Also make total_scan signed, otherwise check (total_scan < 0) below never works.
>
> Hopefully a smaller oversight.
Yeah, it was, but is harmless because it is caught by the next check
of total_scanned. I've made similar "make everything signed" changes
as well.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
--
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 internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-08-22 23:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-22 11:17 [PATCH 1/2] vmscan: fix initial shrinker size handling Konstantin Khlebnikov
2011-08-22 11:17 ` [PATCH 2/2] vmscan: use atomic-long for shrinker batching Konstantin Khlebnikov
2011-08-22 21:39 ` Andrew Morton
2011-08-22 23:26 ` Dave Chinner
2011-08-23 6:56 ` Konstantin Khlebnikov
2011-08-22 21:30 ` [PATCH 1/2] vmscan: fix initial shrinker size handling Andrew Morton
2011-08-22 23:28 ` Dave Chinner [this message]
2011-08-23 6:47 ` Konstantin Khlebnikov
2011-08-22 23:22 ` Dave Chinner
2011-08-22 23:38 ` Andrew Morton
2011-08-23 0:00 ` Dave Chinner
2011-09-13 18:38 ` Johannes Weiner
2011-10-05 21:52 ` Johannes Weiner
2011-10-05 21:58 ` Andrew Morton
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=20110822232834.GV3162@dastard \
--to=david@fromorbit.com \
--cc=akpm@linux-foundation.org \
--cc=khlebnikov@openvz.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.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).