linux-kernel - Re: [PATCH 04/18] MM: perform async writes to SWP_FS

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Message-ID: <YcGTOfZFSFZVuBEv@infradead.org>
Date:   Tue, 21 Dec 2021 00:41:29 -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 04/18] MM: perform async writes to SWP_FS_OPS swap-space

On Fri, Dec 17, 2021 at 10:48:22AM +1100, NeilBrown wrote:
> Writes to SWP_FS_OPS swapspace is currently synchronous.  To make it
> async we need to allocate the kiocb struct which may block, but won't
> block as long as waiting for the write to complete would block.

Against a little helper for the SWP_FS_OPS case of __swap_writepage
would be nice.  But otherwise this looks good to me.