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| author |   Jens Axboe <axboe@fb.com> | 2014-05-22 10:40:51 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-05-22 10:43:07 -0600 |
| commit | 07068d5b8ed8fa6759b2826ba9197e49b69a1fc3 (patch) | |
| tree | 3e13c8e1028e3722be926487acae5473c1eda2be /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | blk-mq: save memory by freeing requests on unused hardware queues (diff) | |
| download | linux-dev-07068d5b8ed8fa6759b2826ba9197e49b69a1fc3.tar.xz linux-dev-07068d5b8ed8fa6759b2826ba9197e49b69a1fc3.zip | |
blk-mq: split make request handler for multi and single queue
We want slightly different behavior from them:
- On single queue devices, we currently use the per-process plug
for deferred IO and for merging.
- On multi queue devices, we don't use the per-process plug, but
we want to go straight to hardware for SYNC IO.
Split blk_mq_make_request() into a blk_sq_make_request() for single
queue devices, and retain blk_mq_make_request() for multi queue
devices. Then we don't need multiple checks for q->nr_hw_queues
in the request mapping.
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
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