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Open Source and information security mailing list archives
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Date: Fri, 14 Aug 2020 02:43:55 +0100 From: Matthew Wilcox <willy@...radead.org> To: Zhaoyang Huang <huangzhaoyang@...il.com> Cc: Roman Gushchin <klamm@...dex-team.ru>, Andrew Morton <akpm@...ux-foundation.org>, Zhaoyang Huang <zhaoyang.huang@...soc.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] mm : update ra->ra_pages if it's NOT equal to bdi->ra_pages 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).
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