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| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2017-04-27 20:11:15 +0300 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-04-28 00:04:27 +0300 |
| commit | 7083abbbfc4fa706ff72d27d33a5214881979336 (patch) | |
| tree | 2fa2f90642cc55502a2f827620d6fd60a6f3e589 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 89bfce763e43fa4897e0d3af6b29ed909df64cfd (diff) | |
| download | linux-7083abbbfc4fa706ff72d27d33a5214881979336.tar.xz | |
dm mpath: avoid that path removal can trigger an infinite loop
If blk_get_request() fails, check whether the failure is due to a path
being removed. If that is the case, fail the path by triggering a call
to fail_path(). This avoids that the following scenario can be
encountered while removing paths:
* CPU usage of a kworker thread jumps to 100%.
* Removing the DM device becomes impossible.
Delay requeueing if blk_get_request() returns -EBUSY or -EWOULDBLOCK,
and the queue is not dying, because in these cases immediate requeuing
is inappropriate.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions