From: Slava Pestov <sp@daterainc.com>
Date: Thu, 1 May 2014 20:48:57 +0000 (-0700)
Subject: bcache: fix uninterruptible sleep in writeback thread
X-Git-Tag: cleanup-for-v3.18~33^2^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e5c353510b26500bd6b8309823ac9ef2837b761;p=pandora-kernel.git

bcache: fix uninterruptible sleep in writeback thread

There were two issues here:

- writeback thread did not start until the device first became dirty
- writeback thread used uninterruptible sleep once running

Without this patch I see kernel warnings printed and a load average of
1.52 after booting my test VM. With this patch the warnings are gone and
the load average is near 0.00 as expected.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
---

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