linux-kernel - Re: [PATCH 06/18] MM: submit multipage reads for SWP_FS

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Message-ID: <YcGT80RFm2oJdC4b@infradead.org>
Date:   Tue, 21 Dec 2021 00:44:35 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     NeilBrown <neilb@...e.de>
Cc:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        Christoph Hellwig <hch@...radead.org>,
        David Howells <dhowells@...hat.com>, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/18] MM: submit multipage reads for SWP_FS_OPS
 swap-space

On Fri, Dec 17, 2021 at 10:48:22AM +1100, NeilBrown wrote:
> Some caller currently call blk_finish_plug() *before* the final call to
> swap_readpage(), so the last page cannot be included.  This patch moves
> blk_finish_plug() to after the last call, and calls swap_read_unplug()
> there too.

Can you move this fix into a separate prep patch, preferably with a
Fixes tag so that it gets picked up for backports?

Otherwise this looks sensible to me.