dm-io: reserve just one bioset structure The number 16 was "magic" and meaningless. This patch changes it to reserve just one "struct bio", which is the minimum required. If there is no memory pressure, the code can allocate arbitrary number of bios. If there is memory pressure, the code can allocate just one bio. The code in "do_region" contains a loop, it allocates a bio, fills it and submits it. If we have just one bio available, the code wouldn't deadlock, it would just wait with the allocation of next bio until the previous bio finished. Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> --- drivers/md/dm-io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6.39-rc7-fast/drivers/md/dm-io.c =================================================================== --- linux-2.6.39-rc7-fast.orig/drivers/md/dm-io.c 2011-05-18 20:51:32.000000000 +0200 +++ linux-2.6.39-rc7-fast/drivers/md/dm-io.c 2011-05-18 20:51:37.000000000 +0200 @@ -57,7 +57,7 @@ struct dm_io_client *dm_io_client_create if (!client->pool) goto bad; - client->bios = bioset_create(16, 0); + client->bios = bioset_create(1, 0); if (!client->bios) goto bad; -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
