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authorMike Snitzer <snitzer@redhat.com>2013-09-12 18:06:12 -0400
committerMike Snitzer <snitzer@redhat.com>2013-09-23 10:42:24 -0400
commite8603136cb04ec2d0c9b4b5be7a071fc003cb399 (patch)
treee642b195034f281eeb76de62f5bcf3deb2985de1 /drivers/md/dm-io.c
parentf47908269fb53d522a956b78612a0037f5faf8e7 (diff)
downloadlinux-e8603136cb04ec2d0c9b4b5be7a071fc003cb399.tar.bz2
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.c7
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;