From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
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: Wed, 12 Feb 2020 08:50:04 +0000 [thread overview]
Message-ID: <20200212085004.GL25745@shell.armlinux.org.uk> (raw)
In-Reply-To: <CAHk-=wg1ZDADD3Vuw_sXhmBOrQ2xsp8YWxmtWiA6vG0RT-ZQ+A@mail.gmail.com>
On Tue, Feb 11, 2020 at 05:03:02PM -0800, Linus Torvalds wrote:
> On Tue, Feb 11, 2020 at 4:47 PM Andrew Morton <akpm@linux-foundation.org> wrote:
> >
> > What's the situation with highmem on ARM?
>
> Afaik it's exactly the same as highmem on x86 - only 32-bit ARM ever
> needed it, and I was ranting at some people for repeating all the
> mistakes Intel did.
>
> But arm64 doesn't need it, and while 32-bit arm is obviosuly still
> selling, I think that in many ways the switch-over to 64-bit has been
> quicker on ARM than it was on x86. Partly because it happened later
> (so all the 64-bit teething pains were dealt with), but largely
> because everybody ended up actively discouraging 32-bit on the Android
> side.
>
> There were a couple of unfortunate early 32-bit arm server attempts,
> but they were - predictably - complete garbage and nobody bought them.
> They don't exist any more.
>
> So at least my gut feel is that the arm people don't have any big
> reason to push for maintaining HIGHMEM support either.
>
> But I'm adding a couple of arm people and the arm list just in case
> they have some input.
>
> [ Obvious background for newly added people: we're talking about
> making CONFIG_HIGHMEM a deprecated feature and saying that if you want
> to run with lots of memory on a 32-bit kernel, you're doing legacy
> stuff and can use a legacy kernel ]
Well, the recent 32-bit ARM systems generally have more than 1G
of memory, so make use of highmem as a rule. You're probably
talking about crippling support for any 32-bit ARM system produced
in the last 8 to 10 years.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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next prev parent reply other threads:[~2020-02-12 8:50 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-11 17:55 [PATCH] vfs: keep inodes with page cache off the inode shrinker LRU 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 [this message]
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
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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