tree a3f4af7e60781f62b52dcfddd2032c3bbf933644
parent 028c2dd184c097809986684f2f0627eea5529fea
author Dave Chinner <dchinner@redhat.com> 1278473048 +1000
committer Jens Axboe <jaxboe@fusionio.com> 1281198266 +0200

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>