diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2013-09-13 00:06:11 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2013-09-23 16:42:23 +0200 |
| commit | 6cfa58573f9b4a543005baa002e137820504c7af (patch) | |
| tree | cb4f5247d973a6133aae4191a30c50ad01d33a7b /drivers/md/dm.c | |
| parent | dm thin: do not expose non-zero discard limits if discards disabled (diff) | |
| download | linux-6cfa58573f9b4a543005baa002e137820504c7af.tar.xz linux-6cfa58573f9b4a543005baa002e137820504c7af.zip | |
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/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 9 |
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; |