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authorMike Snitzer <snitzer@redhat.com>2013-09-13 02:06:12 +0400
committerMike Snitzer <snitzer@redhat.com>2013-09-23 18:42:24 +0400
commitf47908269fb53d522a956b78612a0037f5faf8e7 (patch)
tree47723023a5389daa5cdd974d4b53c3d91198be6e /drivers/md/dm.h
parent6cfa58573f9b4a543005baa002e137820504c7af (diff)
downloadlinux-f47908269fb53d522a956b78612a0037f5faf8e7.tar.xz
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.h2
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;