netdev - Re: [PATCH 22/29] xfs: comment page allocation for nowait case in xfs_buf_find

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Message-ID: <ZOi1/yafn3HQFWnW@casper.infradead.org>
Date: Fri, 25 Aug 2023 15:09:03 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Hao Xu <hao.xu@...ux.dev>
Cc: io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Pavel Begunkov <asml.silence@...il.com>,
	Christian Brauner <brauner@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Stefan Roesch <shr@...com>, Clay Harris <bugs@...ycon.org>,
	Dave Chinner <david@...morbit.com>,
	"Darrick J . Wong" <djwong@...nel.org>,
	linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-cachefs@...hat.com,
	ecryptfs@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-unionfs@...r.kernel.org, bpf@...r.kernel.org,
	netdev@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	linux-btrfs@...r.kernel.org, codalist@...a.cs.cmu.edu,
	linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
	linux-mm@...ck.org, linux-nilfs@...r.kernel.org,
	devel@...ts.orangefs.org, linux-cifs@...r.kernel.org,
	samba-technical@...ts.samba.org, linux-mtd@...ts.infradead.org,
	Wanpeng Li <wanpengli@...cent.com>
Subject: Re: [PATCH 22/29] xfs: comment page allocation for nowait case in
 xfs_buf_find_insert()

On Fri, Aug 25, 2023 at 09:54:24PM +0800, Hao Xu wrote:
> @@ -633,6 +633,8 @@ xfs_buf_find_insert(
>  	 * allocate the memory from the heap to minimise memory usage. If we
>  	 * can't get heap memory for these small buffers, we fall back to using
>  	 * the page allocator.
> +	 * xfs_buf_alloc_kmem may return -EAGAIN, let's not return it but turn
> +	 * to page allocator as well.

This new sentence seems like it says exactly the same thing as the
previous sentence.  What am I missing?