From: Dave Chinner <dchinner@redhat.com>
Date: Wed, 7 Jul 2010 03:24:08 +0000 (+1000)
Subject: writeback: Add tracing to write_cache_pages
X-Git-Tag: v2.6.36-rc1~288^2~95
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e094383b60066996fbc3b53891324e5d2ec858d;p=pandora-kernel.git

writeback: Add tracing to write_cache_pages

Add a trace event to the ->writepage loop in write_cache_pages to give
visibility into how the ->writepage call is changing variables within the
writeback control structure. Of most interest is how wbc->nr_to_write changes
from call to call, especially with filesystems that write multiple pages
in ->writepage.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

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