From: Matthew Wilcox <willy@infradead.org>
To: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
Song Liu <songliubraving@fb.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm,thp: stop leaking unreleased file pages
Date: Wed, 3 Jun 2020 14:51:22 -0700 [thread overview]
Message-ID: <20200603215122.GR19604@bombadil.infradead.org> (raw)
In-Reply-To: <alpine.LSU.2.11.2005271402410.6459@eggly.anvils>
On Wed, May 27, 2020 at 02:28:10PM -0700, Hugh Dickins wrote:
> Saying "source inspection" reminds me: there is another funny in there,
> but I don't think it matters very much in practice, and might need
> rather a lot of testing to justify any particular patch: where
> page_cache_sync_readahead() asks for PAGE_SIZE pages!
>
> "end - index" seems a more reasonable number to me: but then we
> might find that reading ahead into the next huge extent had actually
> been a useful optimization (and those readahead functions impose
> their own caps, so PAGE_SIZE shouldn't work out too outrageously).
That readahead was only added in 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0
so it probably hasn't really been performance tested yet.
next prev parent reply other threads:[~2020-06-03 21:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-24 1:50 [PATCH] mm,thp: stop leaking unreleased file pages Hugh Dickins
2020-05-25 0:05 ` Song Liu
2020-05-25 4:32 ` Kirill A. Shutemov
2020-05-26 16:01 ` Johannes Weiner
2020-05-27 21:28 ` Hugh Dickins
2020-05-28 8:51 ` Naresh Kamboju
2020-06-03 21:51 ` Matthew Wilcox [this message]
2020-06-03 22:19 ` Hugh Dickins
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