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authorDave Chinner <dchinner@redhat.com>2010-07-07 13:24:08 +1000
committerJens Axboe <jaxboe@fusionio.com>2010-08-07 18:24:26 +0200
commit9e094383b60066996fbc3b53891324e5d2ec858d (patch)
treea3f4af7e60781f62b52dcfddd2032c3bbf933644 /drivers/scsi
parent028c2dd184c097809986684f2f0627eea5529fea (diff)
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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