On Wed, Apr 01, 2015 at 07:35:06PM -0700, Darrick J. Wong wrote: > Implement pass-through calls for discard, zero-out, and readahead in > the IO manager so that we can take advantage of any underlying > support. > > Furthermore, improve tdb write-out speed by disabling locking and only > fsyncing at the end -- we don't care about locking because having > multiple writers to the undo file will produce an undo database full > of garbage blocks; and we only need to fsync at the end because if we > fail before the end, our undo file will lack the necessary superblock > data that e2undo requires to do replay safely. Without this, we call > fsync four times per tdb update(!) This reduces the overhead of using > undo_io while converting a 2TB FS to metadata_csum from 3+ hours to 55 > minutes. > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> Thanks, applied. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
