From: Christoph Hellwig <hch@infradead.org>
To: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Yu Kuai <yukuai3@huawei.com>
Subject: Re: [PATCH 6/6] blk-mq: manage hctx map via xarray
Date: Wed, 2 Mar 2022 00:24:34 -0800 [thread overview]
Message-ID: <Yh8pwiR5DWC9ELDD@infradead.org> (raw)
In-Reply-To: <Yh7RDCaqiqMmKj1s@T590>
On Wed, Mar 02, 2022 at 10:06:04AM +0800, Ming Lei wrote:
> I did considered xa_for_each(), but it requires rcu read lock.
No, I doesn't. It just takes a RCU lock internally.
> Also queue_for_each_hw_ctx() is supposed to not run in fast path,
> meantime xa_load() is lightweight enough too, so repeated xa_load()
> is fine here.
I'd rather have the clarity of the proper iterators.
next prev parent reply other threads:[~2022-03-02 8:24 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-28 9:04 [PATCH 0/6] blk-mq: update_nr_hw_queues related improvement & bugfix Ming Lei
2022-02-28 9:04 ` [PATCH 1/6] blk-mq: figure out correct numa node for hw queue Ming Lei
2022-03-01 13:30 ` Christoph Hellwig
2022-03-01 19:19 ` John Garry
2022-03-02 1:47 ` Ming Lei
2022-03-02 9:02 ` John Garry
2022-03-02 9:22 ` Ming Lei
2022-03-02 10:11 ` John Garry
2022-02-28 9:04 ` [PATCH 2/6] blk-mq: simplify reallocation of hw ctxs a bit Ming Lei
2022-03-01 13:30 ` Christoph Hellwig
2022-02-28 9:04 ` [PATCH 3/6] blk-mq: re-config poll after queue map is changed Ming Lei
2022-03-01 13:31 ` Christoph Hellwig
2022-02-28 9:04 ` [PATCH 4/6] block: mtip32xx: don't touch q->queue_hw_ctx Ming Lei
2022-03-01 13:32 ` Christoph Hellwig
2022-02-28 9:04 ` [PATCH 5/6] blk-mq: add helper of blk_mq_get_hctx to retrieve hctx via its index Ming Lei
2022-03-01 13:33 ` Christoph Hellwig
2022-02-28 9:04 ` [PATCH 6/6] blk-mq: manage hctx map via xarray Ming Lei
2022-02-28 17:36 ` kernel test robot
2022-02-28 17:57 ` kernel test robot
2022-03-01 9:08 ` Ming Lei
2022-03-01 9:08 ` Ming Lei
2022-03-01 13:37 ` Christoph Hellwig
2022-03-02 2:06 ` Ming Lei
2022-03-02 8:24 ` Christoph Hellwig [this message]
2022-03-02 9:53 ` Ming Lei
2022-03-02 9:59 ` Christoph Hellwig
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