From: Kashyap Desai <kashyap.desai@broadcom.com>
To: Ming Lei <ming.lei@redhat.com>,
"jianchao.wang" <jianchao.w.wang@oracle.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org,
Laurence Oberman <loberman@redhat.com>,
Omar Sandoval <osandov@fb.com>, Christoph Hellwig <hch@lst.de>,
Bart Van Assche <bart.vanassche@wdc.com>,
Hannes Reinecke <hare@suse.de>
Subject: RE: [PATCH 0/3] blk-mq: improve IO perf in case of none io sched
Date: Thu, 28 Jun 2018 13:10:50 +0530 [thread overview]
Message-ID: <621ef8556c7e2ebade630c42bf8ea920@mail.gmail.com> (raw)
In-Reply-To: <20180628070801.GA20248@ming.t460p>
> Right.
>
> Kashyap, could you test the following patch?
>
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index 2f20c9e3efda..7d972b1c3153 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -1567,7 +1567,7 @@ void blk_mq_insert_requests(struct blk_mq_hw_ctx
> *hctx, struct blk_mq_ctx *ctx,
> }
>
> spin_lock(&ctx->lock);
> - list_splice_tail(list, &ctx->rq_list);
> + list_splice_tail_init(list, &ctx->rq_list);
> blk_mq_hctx_mark_pending(hctx, ctx);
> spin_unlock(&ctx->lock);
I tested above mentioned change and kernel panic as posted in this
discussion is resolved.
Kashyap
> }
>
> Thanks,
> Ming
prev parent reply other threads:[~2018-06-28 7:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-28 3:19 [PATCH 0/3] blk-mq: improve IO perf in case of none io sched Ming Lei
2018-06-28 3:19 ` [PATCH 1/3] blk-mq: use list_splice_tail() to insert requests Ming Lei
2018-06-28 7:27 ` Johannes Thumshirn
2018-06-28 19:44 ` Jens Axboe
2018-06-28 19:52 ` Steven Rostedt
2018-06-28 19:58 ` Jens Axboe
2018-06-28 3:19 ` [PATCH 2/3] blk-mq: only attempt to merge bio if there is rq in sw queue Ming Lei
2018-06-28 3:19 ` [PATCH 3/3] blk-mq: dequeue request one by one from sw queue iff hctx is busy Ming Lei
2018-06-28 5:42 ` [PATCH 0/3] blk-mq: improve IO perf in case of none io sched Kashyap Desai
2018-06-28 6:03 ` jianchao.wang
2018-06-28 6:35 ` Kashyap Desai
2018-06-28 7:08 ` Ming Lei
2018-06-28 7:40 ` Kashyap Desai [this message]
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