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| author | Christoph Hellwig <hch@lst.de> | 2014-04-25 02:32:53 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-04-25 08:24:07 -0600 |
| commit | 38535201633077cbaf8b32886b5e3005b36c9024 (patch) | |
| tree | ad94c4a3d3d7e1b47f2721ac36ab1698349e208d /block/blk-mq.h | |
| parent | 87ee7b112193bd081ba1a171fa5f6f39c429ef56 (diff) | |
| download | linux-0-day-38535201633077cbaf8b32886b5e3005b36c9024.tar.gz linux-0-day-38535201633077cbaf8b32886b5e3005b36c9024.tar.xz | |
blk-mq: respect rq_affinity
The blk-mq code is using it's own version of the I/O completion affinity
tunables, which causes a few issues:
- the rq_affinity sysfs file doesn't work for blk-mq devices, even if it
still is present, thus breaking existing tuning setups.
- the rq_affinity = 1 mode, which is the defauly for legacy request based
drivers isn't implemented at all.
- blk-mq drivers don't implement any completion affinity with the default
flag settings.
This patches removes the blk-mq ipi_redirect flag and sysfs file, as well
as the internal BLK_MQ_F_SHOULD_IPI flag and replaces it with code that
respects the queue-wide rq_affinity flags and also implements the
rq_affinity = 1 mode.
This means I/O completion affinity can now only be tuned block-queue wide
instead of per context, which seems more sensible to me anyway.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq.h')
| -rw-r--r-- | block/blk-mq.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h index b41a784de50df..1ae364ceaf8bb 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -11,7 +11,6 @@ struct blk_mq_ctx { unsigned int cpu; unsigned int index_hw; - unsigned int ipi_redirect; /* incremented at dispatch time */ unsigned long rq_dispatched[2]; |