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authorMike Snitzer <snitzer@redhat.com>2013-09-12 18:06:11 -0400
committerMike Snitzer <snitzer@redhat.com>2013-09-23 10:42:23 -0400
commit6cfa58573f9b4a543005baa002e137820504c7af (patch)
treecb4f5247d973a6133aae4191a30c50ad01d33a7b /drivers/md
parentb60ab990ccdf34b0159bf5ff52f4acee7c940d78 (diff)
dm: lower bio-based mempool reservation
Bio-based device mapper processing doesn't need larger mempools (like request-based DM does), so lower the number of reserved entries for bio-based operation. 16 was already used for bio-based DM's bioset but mistakenly wasn't used for it's _io_cache. Formalize difference between bio-based and request-based defaults by introducing RESERVED_BIO_BASED_IOS and RESERVED_REQUEST_BASED_IOS. (based on older code from Mikulas Patocka) Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Frank Mayhar <fmayhar@google.com> Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 7b0ccdc5d65c..f2e5a50ee84e 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -211,7 +211,8 @@ struct dm_md_mempools {
struct bio_set *bs;
};
-#define MIN_IOS 256
+#define RESERVED_BIO_BASED_IOS 16
+#define RESERVED_REQUEST_BASED_IOS 256
static struct kmem_cache *_io_cache;
static struct kmem_cache *_rq_tio_cache;
@@ -2873,18 +2874,18 @@ struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, u
if (type == DM_TYPE_BIO_BASED) {
cachep = _io_cache;
- pool_size = 16;
+ pool_size = RESERVED_BIO_BASED_IOS;
front_pad = roundup(per_bio_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone);
} else if (type == DM_TYPE_REQUEST_BASED) {
cachep = _rq_tio_cache;
- pool_size = MIN_IOS;
+ pool_size = RESERVED_REQUEST_BASED_IOS;
front_pad = offsetof(struct dm_rq_clone_bio_info, clone);
/* per_bio_data_size is not used. See __bind_mempools(). */
WARN_ON(per_bio_data_size != 0);
} else
goto out;
- pools->io_pool = mempool_create_slab_pool(MIN_IOS, cachep);
+ pools->io_pool = mempool_create_slab_pool(pool_size, cachep);
if (!pools->io_pool)
goto out;