On Wed 04-05-11 15:39:31, Wu Fengguang wrote: > To help understand the behavior change, I wrote the writeback_queue_io > trace event, and found very different patterns between > - vanilla kernel > - this patchset plus the sync livelock fixes > > Basically the vanilla kernel each time pulls a random number of inodes > from b_dirty, while the patched kernel tends to pull a fixed number of > inodes (enqueue=1031) from b_dirty. The new behavior is very interesting... This regularity is really strange. Did you have a chance to look more into it? I find it highly unlikely that there would be exactly 1031 dirty inodes in b_dirty list every time you call move_expired_inodes()... Honza -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
