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dm zoned: add 'message' callback

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Add callback for 'dmsetup message' to allow the reclaim process
to be triggered manually.
Eg.

	dmsetup message /dev/dm-X 0 message

will start the reclaim process even if the default threshold
of 50 percent of free random zones is not reached.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Hannes Reinecke
2020-05-11 10:24:17 +02:00
committed by Mike Snitzer
parent bc3d5717d2
commit 90b39d58f3
2 changed files with 27 additions and 0 deletions
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12
Documentation/admin-guide/device-mapper/dm-zoned.rst
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@@ -160,3 +160,15 @@ where <nr_zones> is the total number of zones, <nr_unmap_rnd> is the number
of unmapped (ie free) random zones, <nr_rnd> the total number of zones,
<nr_unmap_seq> the number of unmapped sequential zones, and <nr_seq> the
total number of sequential zones.
Normally the reclaim process will be started once there are less than 50
percent free random zones. In order to start the reclaim process manually
even before reaching this threshold the 'dmsetup message' function can be
used:
Ex::
dmsetup message /dev/dm-X 0 reclaim
will start the reclaim process and random zones will be moved to sequential
zones.