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| 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.c | |
| parent | f47908269fb53d522a956b78612a0037f5faf8e7 (diff) | |
| download | blackbird-op-linux-e8603136cb04ec2d0c9b4b5be7a071fc003cb399.tar.gz blackbird-op-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.c')
| -rw-r--r-- | drivers/md/dm.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 1e85f1da1ef3..b3e26c7d1417 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -218,6 +218,11 @@ static struct kmem_cache *_io_cache; static struct kmem_cache *_rq_tio_cache; /* + * Bio-based DM's mempools' reserved IOs set by the user. + */ +static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS; + +/* * Request-based DM's mempools' reserved IOs set by the user. */ static unsigned reserved_rq_based_ios = RESERVED_REQUEST_BASED_IOS; @@ -241,6 +246,13 @@ static unsigned __dm_get_reserved_ios(unsigned *reserved_ios, return ios; } +unsigned dm_get_reserved_bio_based_ios(void) +{ + return __dm_get_reserved_ios(&reserved_bio_based_ios, + RESERVED_BIO_BASED_IOS, RESERVED_MAX_IOS); +} +EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios); + unsigned dm_get_reserved_rq_based_ios(void) { return __dm_get_reserved_ios(&reserved_rq_based_ios, @@ -2906,7 +2918,7 @@ struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, u if (type == DM_TYPE_BIO_BASED) { cachep = _io_cache; - pool_size = RESERVED_BIO_BASED_IOS; + pool_size = dm_get_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; @@ -2969,6 +2981,9 @@ module_exit(dm_exit); module_param(major, uint, 0); MODULE_PARM_DESC(major, "The major number of the device mapper"); +module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools"); + module_param(reserved_rq_based_ios, uint, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(reserved_rq_based_ios, "Reserved IOs in request-based mempools"); |
