raid5 rebuild takes stripes so agressively that other
access cannot get a look-in.
With this patch, the rebuild pauses slightly if there is a
shortage of stripes to let other processes have a chance.
----------- Diffstat output ------------
./drivers/md/raid5.c | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletion(-)
diff ./drivers/md/raid5.c~current~ ./drivers/md/raid5.c
--- ./drivers/md/raid5.c~current~ 2004-01-16 11:58:51.000000000 +1100
+++ ./drivers/md/raid5.c 2004-01-16 11:59:17.000000000 +1100
@@ -1395,7 +1395,14 @@ static int sync_request (mddev_t *mddev,
first_sector = raid5_compute_sector(stripe*data_disks*sectors_per_chunk
+ chunk_offset, raid_disks, data_disks, &dd_idx, &pd_idx, conf);
- sh = get_active_stripe(conf, sector_nr, pd_idx, 0);
+ sh = get_active_stripe(conf, sector_nr, pd_idx, 1);
+ if (sh == NULL) {
+ sh = get_active_stripe(conf, sector_nr, pd_idx, 0);
+ /* make sure we don't swamp the stripe cache if someone else
+ * is trying to get access
+ */
+ yield();
+ }
spin_lock(&sh->lock);
set_bit(STRIPE_SYNCING, &sh->state);
clear_bit(STRIPE_INSYNC, &sh->state);
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
