From: Matthew Wilcox <willy@infradead.org>
To: Zhaoyang Huang <huangzhaoyang@gmail.com>
Cc: Roman Gushchin <klamm@yandex-team.ru>,
Andrew Morton <akpm@linux-foundation.org>,
Zhaoyang Huang <zhaoyang.huang@unisoc.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm : update ra->ra_pages if it's NOT equal to bdi->ra_pages
Date: Fri, 14 Aug 2020 02:43:55 +0100 [thread overview]
Message-ID: <20200814014355.GS17456@casper.infradead.org> (raw)
In-Reply-To: <1597368611-7631-1-git-send-email-zhaoyang.huang@unisoc.com>
On Fri, Aug 14, 2020 at 09:30:11AM +0800, Zhaoyang Huang wrote:
> file->f_ra->ra_pages will remain the initialized value since it opend, which may
> be NOT equal to bdi->ra_pages as the latter one is updated somehow(etc,
> echo xxx > /sys/block/dm/queue/read_ahead_kb).So sync ra->ra_pages to the
> updated value when sync read.
It still ignores the work done by shrink_readahead_size_eio()
and fadvise(POSIX_FADV_SEQUENTIAL).
next prev parent reply other threads:[~2020-08-14 1:44 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-14 1:30 [PATCH] mm : update ra->ra_pages if it's NOT equal to bdi->ra_pages Zhaoyang Huang
2020-08-14 1:43 ` Matthew Wilcox [this message]
2020-08-14 2:07 ` Matthew Wilcox
2020-08-14 2:20 ` Zhaoyang Huang
2020-08-14 2:26 ` Zhaoyang Huang
2020-08-14 2:31 ` Matthew Wilcox
2020-08-14 2:33 ` Andrew Morton
2020-08-14 2:45 ` Zhaoyang Huang
2020-08-14 3:19 ` Matthew Wilcox
2020-08-14 22:17 ` Minchan Kim
2020-08-14 17:46 ` Matthew Wilcox
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