dm: add reserved_rq_based_ios module parameter
authorMike Snitzer <snitzer@redhat.com>
Thu, 12 Sep 2013 22:06:12 +0000 (18:06 -0400)
committerMike Snitzer <snitzer@redhat.com>
Mon, 23 Sep 2013 14:42:24 +0000 (10:42 -0400)
commitf47908269fb53d522a956b78612a0037f5faf8e7
tree47723023a5389daa5cdd974d4b53c3d91198be6e
parent6cfa58573f9b4a543005baa002e137820504c7af
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>
drivers/md/dm-mpath.c
drivers/md/dm.c
drivers/md/dm.h