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authorTejun Heo <tj@kernel.org>2010-10-15 15:36:08 +0200
committerNeilBrown <neilb@suse.de>2010-10-28 17:32:29 +1100
commite804ac780e2f01cb3b914daca2fd4780d1743db1 (patch)
tree60447c76ea9dbaa526c8cabc14898e4df4498bf6 /drivers/md/raid1.c
parent57dab0bdf689d42972975ec646d862b0900a4bf3 (diff)
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md: fix and update workqueue usage
Workqueue usage in md has two problems. * Flush can be used during or depended upon by memory reclaim, but md uses the system workqueue for flush_work which may lead to deadlock. * md depends on flush_scheduled_work() to achieve exclusion against completion of removal of previous instances. flush_scheduled_work() may incur unexpected amount of delay and is scheduled to be removed. This patch adds two workqueues to md - md_wq and md_misc_wq. The former is guaranteed to make forward progress under memory pressure and serves flush_work. The latter serves as the flush domain for other works. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid1.c')
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