From: Chris Mason <chris.mason@oracle.com>
Date: Wed, 4 Feb 2009 14:33:00 +0000 (-0500)
Subject: Btrfs: don't return congestion in write_cache_pages as often
X-Git-Tag: v2.6.29-rc4~9^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9b0d3ace33ef225690a86d7130feadb22367f496;p=pandora-kernel.git

Btrfs: don't return congestion in write_cache_pages as often

On fast devices that go from congested to uncongested very quickly, pdflush
is waiting too often in congestion_wait, and the FS is backing off to
easily in write_cache_pages.

For now, fix this on the btrfs side by only checking congestion after
some bios have already gone down.  Longer term a real fix is needed
for pdflush, but that is a larger project.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

Reading git-diff-tree failed