From: Andrew Morton <akpm@linux-foundation.org>
To: Jan Kara <jack@suse.cz>
Cc: LKML <linux-kernel@vger.kernel.org>,
npiggin@suse.de, fengguang.wu@intel.com
Subject: Re: [PATCH 2/3] mm: Implement writeback livelock avoidance using page tagging
Date: Fri, 12 Feb 2010 11:39:55 -0800 [thread overview]
Message-ID: <20100212113955.4c023130.akpm@linux-foundation.org> (raw)
In-Reply-To: <1265929584-5080-3-git-send-email-jack@suse.cz>
On Fri, 12 Feb 2010 00:06:23 +0100
Jan Kara <jack@suse.cz> wrote:
> The idea is simple: Tag all pages that should be written back
> with a special tag (TOWRITE) in the radix tree. This can be done
> rather quickly and thus livelocks should not happen in practice.
> Then we start doing the hard work of locking pages and sending
> them to disk only for those pages that have TOWRITE tag set.
Adding a second pass across all the pages sounds expensive?
next prev parent reply other threads:[~2010-02-12 19:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-11 23:06 [RFC] [PATCH 0/3] Writeback livelock avoidance using page tags (v2) Jan Kara
2010-02-11 23:06 ` [PATCH 1/3] radix-tree: Implement function radix_tree_gang_tag_if_tagged Jan Kara
2010-02-15 16:01 ` Nick Piggin
2010-02-11 23:06 ` [PATCH 2/3] mm: Implement writeback livelock avoidance using page tagging Jan Kara
2010-02-12 19:39 ` Andrew Morton [this message]
2010-02-15 15:47 ` Jan Kara
2010-02-15 16:21 ` Nick Piggin
2010-02-15 16:24 ` Christoph Hellwig
2010-02-15 16:37 ` Nick Piggin
2010-02-15 19:57 ` Jan Kara
2010-02-16 14:19 ` Nick Piggin
2010-02-11 23:06 ` [PATCH 3/3] mm: Debugging of new livelock avoidance Jan Kara
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