From: David Woodhouse <dwmw2@infradead.org>
Date: Thu, 8 Mar 2007 10:28:30 +0000 (+0000)
Subject: [JFFS2] Use yield() between GC passes in background thread.
X-Git-Tag: v2.6.21-rc4~69^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f8a922c7bb4d93bd84b7371a8e2571e667d2afb5;p=pandora-kernel.git

[JFFS2] Use yield() between GC passes in background thread.

The garbage collection thread is strictly an optimisation. Everything it
does would also be done just-in-time in the context of something in
userspace trying to access the file system.

Sometimes, however, it's a pessimisation. Especially during early boot
when it's checksumming nodes and scanning inodes which are shortly going
to be pulled in by read_inode anyway. We end up building the rbtree of
node coverage twice for the same inode.

By switching to yield() instead of cond_resched() in the main loop, we
observe boot times on the OLPC system going down from about 100 seconds to
60.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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