From: Shaohua Li <shli@fb.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: <linux-block@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<axboe@fb.com>, <Kernel-team@fb.com>
Subject: Re: [PATCH 1/3] blk-mq: add an API to estimate hardware queue node
Date: Tue, 29 Mar 2016 09:47:23 -0700 [thread overview]
Message-ID: <20160329164722.GA1208161@devbig084.prn1.facebook.com> (raw)
In-Reply-To: <20160329072443.GA18920@infradead.org>
On Tue, Mar 29, 2016 at 12:24:43AM -0700, Christoph Hellwig wrote:
> On Fri, Mar 25, 2016 at 02:36:30PM -0700, Shaohua Li wrote:
> > we allocate most data structure in device's node, but some data
> > structures are not for DMA and mostly used by specific cpus/node which
> > could diff from device's node. Allocating such hot data in device's
> > node doesn't make sense. Add an API to estimate hardware queue node.
> > This can be used before blk-mq actually establishes the mapping. This
> > API runs slow, but it only used in initialization time.
>
> I think this is the wrong way around. I've got some proprotype code
> that just leaves the cpu assignments to the drivers and picks it up
> in blk-mq. Give me a few days to post it..
This looks weird, shouldn't the cpu assignment be determined by block
core (blk-mq) because block core decides how to use the queue?
next prev parent reply other threads:[~2016-03-29 16:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-25 21:36 [PATCH 1/3] blk-mq: add an API to estimate hardware queue node Shaohua Li
2016-03-25 21:36 ` [PATCH 2/3] blk-mq: allocate blk_mq_tags and requests in correct node Shaohua Li
2016-03-25 21:36 ` [PATCH 3/3] nvme: allocate nvme_queue " Shaohua Li
2016-03-29 7:24 ` [PATCH 1/3] blk-mq: add an API to estimate hardware queue node Christoph Hellwig
2016-03-29 16:47 ` Shaohua Li [this message]
2016-03-29 16:50 ` Jens Axboe
2016-03-29 17:44 ` Christoph Hellwig
2016-03-29 20:51 ` Jens Axboe
2016-03-29 21:20 ` Christoph Hellwig
2016-03-29 21:22 ` Jens Axboe
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