linux-kernel - Re: [PATCH 1/3] blk-mq: add an API to estimate hardware queue node

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Message-ID: <20160329072443.GA18920@infradead.org>
Date:	Tue, 29 Mar 2016 00:24:43 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Shaohua Li <shli@...com>
Cc:	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...com, hch@...radead.org, Kernel-team@...com
Subject: Re: [PATCH 1/3] blk-mq: add an API to estimate hardware queue node

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..