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Illumos 4753 - increase number of outstanding async writes when sync task is waiting

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Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Garrett D'Amore <garrett@damore.org>

References:
    https://www.illumos.org/issues/4753
    https://github.com/illumos/illumos-gate/commit/73527f4

Comments by Matt Ahrens from the issue tracker:
    When a sync task is waiting for a txg to complete, we should hurry
    it along by increasing the number of outstanding async writes
    (i.e. make vdev_queue_max_async_writes() return a larger number).
    Initially we might just have a tunable for "minimum async writes
    while a synctask is waiting" and set it to 3.

Ported-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2716
This commit is contained in:
Alex Reece
2014-07-18 07:08:31 -08:00
committed by Brian Behlendorf
parent 1f6f97f304
commit acbad6ff67
5 changed files with 46 additions and 6 deletions
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module/zfs/spa_misc.c
+10
View File
@@ -1756,6 +1756,16 @@ spa_writeable(spa_t *spa)
return (!!(spa->spa_mode & FWRITE));
}
/*
* Returns true if there is a pending sync task in any of the current
* syncing txg, the current quiescing txg, or the current open txg.
*/
boolean_t
spa_has_pending_synctask(spa_t *spa)
{
return (!txg_all_lists_empty(&spa->spa_dsl_pool->dp_sync_tasks));
}
int
spa_mode(spa_t *spa)
{