diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2013-09-12 18:06:12 -0400 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2013-09-23 10:42:24 -0400 |
| commit | e8603136cb04ec2d0c9b4b5be7a071fc003cb399 (patch) | |
| tree | e642b195034f281eeb76de62f5bcf3deb2985de1 /drivers/md/dm-io.c | |
| parent | f47908269fb53d522a956b78612a0037f5faf8e7 (diff) | |
| download | blackbird-obmc-linux-e8603136cb04ec2d0c9b4b5be7a071fc003cb399.tar.gz blackbird-obmc-linux-e8603136cb04ec2d0c9b4b5be7a071fc003cb399.zip | |
dm: add reserved_bio_based_ios module parameter
Allow user to change the number of IOs that are reserved by
bio-based DM's mempools by writing to this file:
/sys/module/dm_mod/parameters/reserved_bio_based_ios
The default value is RESERVED_BIO_BASED_IOS (16). The maximum allowed
value is RESERVED_MAX_IOS (1024).
Export dm_get_reserved_bio_based_ios() for use by DM targets and core
code. Switch to sizing dm-io's mempool and bioset using DM core's
configurable 'reserved_bio_based_ios'.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Frank Mayhar <fmayhar@google.com>
Diffstat (limited to 'drivers/md/dm-io.c')
| -rw-r--r-- | drivers/md/dm-io.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c index ea49834377c8..2a20986a2fec 100644 --- a/drivers/md/dm-io.c +++ b/drivers/md/dm-io.c @@ -19,8 +19,6 @@ #define DM_MSG_PREFIX "io" #define DM_IO_MAX_REGIONS BITS_PER_LONG -#define MIN_IOS 16 -#define MIN_BIOS 16 struct dm_io_client { mempool_t *pool; @@ -50,16 +48,17 @@ static struct kmem_cache *_dm_io_cache; struct dm_io_client *dm_io_client_create(void) { struct dm_io_client *client; + unsigned min_ios = dm_get_reserved_bio_based_ios(); client = kmalloc(sizeof(*client), GFP_KERNEL); if (!client) return ERR_PTR(-ENOMEM); - client->pool = mempool_create_slab_pool(MIN_IOS, _dm_io_cache); + client->pool = mempool_create_slab_pool(min_ios, _dm_io_cache); if (!client->pool) goto bad; - client->bios = bioset_create(MIN_BIOS, 0); + client->bios = bioset_create(min_ios, 0); if (!client->bios) goto bad; |
