Re: [PATCH 0/2] small optimization for accessing queue map
On 1/24/19 3:25 AM, Jianchao Wang wrote: > Hi Jens > > These two patches are small optimization for accessing the queue mapping > in hot path. It saves the queue mapping results into blk_mq_ctx directly, > then we needn't do the complicated bounce on queue_hw_ctx[] map[] and > mq_map[]. Doing some targeted testing, the cycles wasted on the double indirect are reclaimed with this. I've applied both for 5.1, thanks. -- Jens Axboe
Re: [PATCH 0/2] small optimization for accessing queue map
On 1/24/19 3:25 AM, Jianchao Wang wrote: > Hi Jens > > These two patches are small optimization for accessing the queue mapping > in hot path. It saves the queue mapping results into blk_mq_ctx directly, > then we needn't do the complicated bounce on queue_hw_ctx[] map[] and > mq_map[]. I like this a lot, the current double indirect does suck, and it does show up in profiles as well. I'll run some testing with this, thanks! -- Jens Axboe
[PATCH 0/2] small optimization for accessing queue map
Hi Jens These two patches are small optimization for accessing the queue mapping in hot path. It saves the queue mapping results into blk_mq_ctx directly, then we needn't do the complicated bounce on queue_hw_ctx[] map[] and mq_map[]. Jianchao Wang (2) blk-mq: save queue mapping result into ctx directly blk-mq: save default hctx into ctx->hctxs block/blk-mq-sched.c | 2 +- block/blk-mq-tag.c | 2 +- block/blk-mq.c | 13 ++--- block/blk-mq.h | 20 +--- block/blk.h | 2 +- 5 files changed, 22 insertions(+), 17 deletions(-) Thanks Jianchao
