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| author | Tao Ma <boyu.mt@taobao.com> | 2011-08-05 09:37:10 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-08-05 09:37:47 +0200 |
| commit | 35ae66e0a09ab70ed588e65f26b4c725cd1656b6 (patch) | |
| tree | 10f866f13a32109f7fa23ab8ab392fab759c9f6d /block/blk-softirq.c | |
| parent | f41c53a569c4cf0556893ec9cfcf697d069799e1 (diff) | |
| download | lwn-35ae66e0a09ab70ed588e65f26b4c725cd1656b6.tar.gz lwn-35ae66e0a09ab70ed588e65f26b4c725cd1656b6.zip | |
block: Make rq_affinity = 1 work as expected
Commit 5757a6d76c introduced a new rq_affinity = 2 so as to make
the request completed in the __make_request cpu. But it makes the
old rq_affinity = 1 not work any more. The root cause is that
if the 'cpu' and 'req->cpu' is in the same group and cpu != req->cpu,
ccpu will be the same as group_cpu, so the completion will be
excuted in the 'cpu' not 'group_cpu'.
This patch fix problem by simpling removing group_cpu and the codes
are more explicit now. If ccpu == cpu, we complete in cpu, otherwise
we raise_blk_irq to ccpu.
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Reviewed-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-softirq.c')
| -rw-r--r-- | block/blk-softirq.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/block/blk-softirq.c b/block/blk-softirq.c index 475fab809a80..487addc85bb5 100644 --- a/block/blk-softirq.c +++ b/block/blk-softirq.c @@ -103,7 +103,7 @@ static struct notifier_block __cpuinitdata blk_cpu_notifier = { void __blk_complete_request(struct request *req) { - int ccpu, cpu, group_cpu = NR_CPUS; + int ccpu, cpu; struct request_queue *q = req->q; unsigned long flags; @@ -117,14 +117,12 @@ void __blk_complete_request(struct request *req) */ if (test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags) && req->cpu != -1) { ccpu = req->cpu; - if (!test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags)) { + if (!test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags)) ccpu = blk_cpu_to_group(ccpu); - group_cpu = blk_cpu_to_group(cpu); - } } else ccpu = cpu; - if (ccpu == cpu || ccpu == group_cpu) { + if (ccpu == cpu) { struct list_head *list; do_local: list = &__get_cpu_var(blk_cpu_done); |