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Date: Mon, 31 Jul 2017 09:42:06 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 0/3] remove rw_page() from brd, pmem and btt
Message-ID: <20170731074206.GA16706@lst.de>
References: <20170728165604.10455-1-ross.zwisler@linux.intel.com>
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To: Minchan Kim <minchan@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>, Jerome Marchand <jmarchan@redhat.com>, linux-nvdimm@lists.01.org, Dave Chinner <david@fromorbit.com>, linux-kernel@vger.kernel.org, Matthew Wilcox <willy@infradead.org>, seungho1.park@lge.com, Jan Kara <jack@suse.cz>, Andrew Morton <akpm@linux-foundation.org>, "karam . lee" <karam.lee@lge.com>, Christoph Hellwig <hch@lst.de>, Nitin Gupta <ngupta@vflare.org>
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On Mon, Jul 31, 2017 at 04:36:47PM +0900, Minchan Kim wrote:
> Do you suggest define something special flag(e.g., SWP_INMEMORY)
> for in-memory swap to swap_info_struct when swapon time manually
> or from bdi_queue_someting automatically?
> And depending the flag of swap_info_struct, use the onstack bio
> instead of dynamic allocation if the swap device is in-memory?

Currently swap always just does I/O on a single page as far
as I can tell, so it can always just use an on-stack bio and
biovec.
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