linux-kernel - Re: [PATCH] mm : sync ra->ra_pages with bdi->ra

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 14 Aug 2020 21:14:59 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Zhaoyang Huang <huangzhaoyang@...il.com>,
        Roman Gushchin <klamm@...dex-team.ru>,
        Zhaoyang Huang <zhaoyang.huang@...soc.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm : sync ra->ra_pages with bdi->ra_pages

On Fri, 14 Aug 2020 13:10:34 -0700 Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Fri, 14 Aug 2020 17:03:44 +0800 Zhaoyang Huang <huangzhaoyang@...il.com> wrote:
> 
> > Some system(like android) will turbo read during startup via expanding the
> > readahead window and then set it back to normal(128kb as usual). However, some
> > files in the system process context will keep to be opened since it is opened
> > up and has no chance to sync with the updated value as it is almost impossible
> > to change the files attached to the inode(processes are unaware of these things)
> 
> How about making VM_READAHEAD_PAGES a variable?

Or make it settable in Kconfig?