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From: Pavel Machek <pavel@ucw.cz>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Rik van Riel <riel@surriel.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Dave Chinner <david@fromorbit.com>,
	Yafang Shao <laoar.shao@gmail.com>,
	Michal Hocko <mhocko@suse.com>, Roman Gushchin <guro@fb.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	kernel-team@fb.com
Subject: Re: [PATCH] vfs: keep inodes with page cache off the inode shrinker LRU
Date: Mon, 17 Feb 2020 14:31:10 +0100
Message-ID: <20200217133110.GA32298@duo.ucw.cz> (raw)
In-Reply-To: <CAHk-=wiGbz3oRvAVFtN-whW-d2F-STKsP1MZT4m_VeycAr1_VQ@mail.gmail.com>


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Hi!

> > Testing this will be a challenge, but the issue was real - a 7GB
> > highmem machine isn't crazy and I expect the inode has become larger
> > since those days.
> 
> Hmm. I would say that in the intening years a 7GB highmem machine has
> indeed become crazy.
> 
> It used to be something we kind of supported.
> 
> But we really should consider HIGHMEM to be something that is on the
> deprecation list. In this day and age, there is no excuse for running
> a 32-bit kernel with lots of physical memory.
> 
> And if you really want to do that, and have some legacy hardware with
> a legacy use case, maybe you should be using a legacy kernel.
> 
> I'd personally be perfectly happy to start removing HIGHMEM support again.

7GB HIGHMEM machine may be unusual, but AFAICT HIGHMEM is need for
configurations like 1GB x86 machine, and definitely for 3GB x86
machine.

32-bit machines with 1.5 to 4GB of RAM are still pretty common (I have
two of those), and dropping HIGHMEM support will limit them to 0.8GB
RAM and probably make them unusable even for simple web browsing. I
have two such machines here, please don't break them :-).

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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  parent reply index

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-11 17:55 Johannes Weiner
2020-02-11 18:20 ` Johannes Weiner
2020-02-11 19:05 ` Rik van Riel
2020-02-11 19:31   ` Johannes Weiner
2020-02-11 23:44     ` Andrew Morton
2020-02-12  0:28       ` Linus Torvalds
2020-02-12  0:47         ` Andrew Morton
2020-02-12  1:03           ` Linus Torvalds
2020-02-12  8:50             ` Russell King - ARM Linux admin
2020-02-13  9:50               ` Lucas Stach
2020-02-13 16:52               ` Arnd Bergmann
2020-02-15 11:25                 ` Geert Uytterhoeven
2020-02-15 16:59                   ` Arnd Bergmann
2020-02-16  9:44                     ` Geert Uytterhoeven
2020-02-16 19:54                       ` Chris Paterson
2020-02-16 20:38                         ` Arnd Bergmann
2020-02-20 14:35                           ` Chris Paterson
2020-02-26 18:04                 ` santosh.shilimkar
2020-02-26 21:01                   ` Arnd Bergmann
2020-02-26 21:11                     ` santosh.shilimkar
2020-03-06 20:34                       ` Nishanth Menon
2020-03-07  1:08                         ` santosh.shilimkar
2020-03-08 10:58                         ` Arnd Bergmann
2020-03-08 14:19                           ` Russell King - ARM Linux admin
2020-03-09 13:33                             ` Arnd Bergmann
2020-03-09 14:04                               ` Russell King - ARM Linux admin
2020-03-09 15:04                                 ` Arnd Bergmann
2020-03-10  9:16                                   ` Michal Hocko
2020-03-09 15:59                           ` Catalin Marinas
2020-03-09 16:09                             ` Russell King - ARM Linux admin
2020-03-09 16:57                               ` Catalin Marinas
2020-03-09 19:46                               ` Arnd Bergmann
2020-03-11 14:29                                 ` Catalin Marinas
2020-03-11 16:59                                   ` Arnd Bergmann
2020-03-11 17:26                                     ` Catalin Marinas
2020-03-11 22:21                                       ` Arnd Bergmann
2020-02-12  3:58         ` Matthew Wilcox
2020-02-12  8:09         ` Michal Hocko
2020-02-17 13:31         ` Pavel Machek [this message]
2020-02-12 16:35       ` Johannes Weiner
2020-02-12 18:26         ` Andrew Morton
2020-02-12 18:52           ` Johannes Weiner
2020-02-12 12:25 ` Yafang Shao
2020-02-12 16:42   ` Johannes Weiner
2020-02-13  1:47     ` Yafang Shao
2020-02-13 13:46       ` Johannes Weiner
2020-02-14  2:02         ` Yafang Shao
2020-02-13 18:34 ` [PATCH v2] " Johannes Weiner
2020-02-14 16:53 ` [PATCH] " kbuild test robot
2020-02-14 21:30 ` kbuild test robot
2020-02-14 21:30 ` [PATCH] vfs: fix boolreturn.cocci warnings kbuild test robot
2020-05-12 21:29 ` [PATCH] vfs: keep inodes with page cache off the inode shrinker LRU Johannes Weiner
2020-05-13  1:32   ` Yafang Shao
2020-05-13 13:00     ` Johannes Weiner
2020-05-13 21:15   ` Andrew Morton
2020-05-14 11:27     ` Johannes Weiner
2020-05-14  2:24   ` Andrew Morton
2020-05-14 10:37     ` Johannes Weiner

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