IB/hfi1: Avoid hardlockup with flushlist_lock

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Heavy contention of the sde flushlist_lock can cause hard lockups at
extreme scale when the flushing logic is under stress.

Mitigate by replacing the item at a time copy to the local list with
an O(1) list_splice_init() and using the high priority work queue to
do the flushes.

Fixes: 7724105686 ("IB/hfi1: add driver files")
Cc: <stable@vger.kernel.org>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

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Mike Marciniszyn 2019-06-14 12:32:26 -04:00 • committed by Doug Ledford

parent cc78076af1

commit cf131a8196

1 changed files with 3 additions and 6 deletions

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9

drivers/infiniband/hw/hfi1/sdma.c

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