[dm-devel] [PATCH 4/4] dm-writecache: count the number of blocks discarded, not the number of discard bios
Mikulas Patocka
mpatocka at redhat.com
Mon Jul 11 20:31:52 UTC 2022
Change dm-writecache, so that it counts the number of blocks discarded
instead of the number of discard bios. Make it consistent with the read
and write statistics counters that were changed to count the number of
blocks instead of bios.
Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>
Index: linux-2.6/drivers/md/dm-writecache.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-writecache.c
+++ linux-2.6/drivers/md/dm-writecache.c
@@ -1514,7 +1514,7 @@ static enum wc_map_op writecache_map_flu
static enum wc_map_op writecache_map_discard(struct dm_writecache *wc, struct bio *bio)
{
- wc->stats.discards++;
+ wc->stats.discards += bio->bi_iter.bi_size >> wc->block_size_bits;
if (writecache_has_error(wc))
return WC_MAP_ERROR;
Index: linux-2.6/Documentation/admin-guide/device-mapper/writecache.rst
===================================================================
--- linux-2.6.orig/Documentation/admin-guide/device-mapper/writecache.rst
+++ linux-2.6/Documentation/admin-guide/device-mapper/writecache.rst
@@ -87,7 +87,7 @@ Status:
11. the number of write blocks that are allocated in the cache
12. the number of write requests that are blocked on the freelist
13. the number of flush requests
-14. the number of discard requests
+14. the number of discarded blocks
Messages:
flush
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