dm kcopyd: avoid pointless job splitting

Don't split SUB_JOB_SIZE jobs

If the job size equals SUB_JOB_SIZE, there is no point in splitting it.
Splitting it just unnecessarily wastes time, because the split job size
is SUB_JOB_SIZE too.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index 1bb73a13ca4003d841446efbe70ffda93a62061d..505b6f5cd3856eb207dbeb6a5d15c21fd4485ffd 100644 (file)
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -578,7 +578,7 @@ int dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
        job->fn = fn;
        job->context = context;
 
-       if (job->source.count < SUB_JOB_SIZE)
+       if (job->source.count <= SUB_JOB_SIZE)
                dispatch_job(job);
 
        else {