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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 | f47908269fb53d522a956b78612a0037f5faf8e7 (patch) | |
| tree | 47723023a5389daa5cdd974d4b53c3d91198be6e /drivers/md/dm.h | |
| parent | dm: lower bio-based mempool reservation (diff) | |
| download | linux-dev-f47908269fb53d522a956b78612a0037f5faf8e7.tar.xz linux-dev-f47908269fb53d522a956b78612a0037f5faf8e7.zip | |
dm: add reserved_rq_based_ios module parameter
Allow user to change the number of IOs that are reserved by
request-based DM's mempools by writing to this file:
/sys/module/dm_mod/parameters/reserved_rq_based_ios
The default value is RESERVED_REQUEST_BASED_IOS (256). The maximum
allowed value is RESERVED_MAX_IOS (1024).
Export dm_get_reserved_rq_based_ios() for use by DM targets and core
code. Switch to sizing dm-mpath's mempool using DM core's configurable
'reserved_rq_based_ios'.
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.h')
| -rw-r--r-- | drivers/md/dm.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 5e604cc7b4aa..15396501e0b3 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -184,6 +184,8 @@ void dm_free_md_mempools(struct dm_md_mempools *pools); /* * Helpers that are used by DM core */ +unsigned dm_get_reserved_rq_based_ios(void); + static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen) { return !maxlen || strlen(result) + 1 >= maxlen; |