From: Jan Kara <jack@suse.cz>
To: Matthew Wilcox <willy@infradead.org>
Cc: Liu Shixin <liushixin2@huawei.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 1/2] mm/readahead: stop readahead loop if memcg charge fails
Date: Thu, 1 Feb 2024 14:52:31 +0100 [thread overview]
Message-ID: <20240201135231.tgnn7cnlmtqh5n4f@quack3> (raw)
In-Reply-To: <Zbug14NoOHFmfLst@casper.infradead.org>
On Thu 01-02-24 13:47:03, Matthew Wilcox wrote:
> On Thu, Feb 01, 2024 at 06:08:34PM +0800, Liu Shixin wrote:
> > @@ -247,9 +248,12 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
> > folio = filemap_alloc_folio(gfp_mask, 0);
> > if (!folio)
> > break;
> > - if (filemap_add_folio(mapping, folio, index + i,
> > - gfp_mask) < 0) {
> > +
> > + ret = filemap_add_folio(mapping, folio, index + i, gfp_mask);
> > + if (ret < 0) {
> > folio_put(folio);
> > + if (ret == -ENOMEM)
> > + break;
>
> No, that's too early. You've still got a batch of pages which were
> successfully added; you have to read them. You were only off by one
> line though ;-)
There's a read_pages() call just outside of the loop so this break is
actually fine AFAICT.
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2024-02-01 13:52 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-01 10:08 [PATCH 0/2] Fix I/O high when memory almost met memcg limit Liu Shixin
2024-02-01 10:08 ` [PATCH 1/2] mm/readahead: stop readahead loop if memcg charge fails Liu Shixin
2024-02-01 9:28 ` Jan Kara
2024-02-01 13:47 ` Matthew Wilcox
2024-02-01 13:52 ` Jan Kara [this message]
2024-02-01 13:53 ` Matthew Wilcox
2024-02-01 10:08 ` [PATCH 2/2] mm/readahead: limit sync readahead while too many active refault Liu Shixin
2024-02-01 9:37 ` Jan Kara
2024-02-01 10:41 ` Liu Shixin
2024-02-01 17:31 ` Jan Kara
2024-02-02 1:25 ` Liu Shixin
2024-02-02 9:02 ` Liu Shixin
2024-02-29 9:01 ` Liu Shixin
2024-03-05 7:07 ` Liu Shixin
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