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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Juri Lelli <juri.lelli@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Ben Segall <bsegall@google.com>, Linux-MM <linux-mm@kvack.org>,
	linux-hexagon@vger.kernel.org, Will Deacon <will@kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Anton Ivanov <anton.ivanov@cambridgegreys.com>,
	linux-arch <linux-arch@vger.kernel.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Brian Cain <bcain@codeaurora.org>,
	Richard Weinberger <richard@nod.at>,
	Russell King <linux@armlinux.org.uk>,
	Ard Biesheuvel <ardb@kernel.org>, David Airlie <airlied@linux.ie>,
	Ingo Molnar <mingo@redhat.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Mel Gorman <mgorman@suse.de>,
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	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Rodrigo Vivi <rodrigo.vivi@intel.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
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	Richard Henderson <rth@twiddle.net>,
	Chris Zankel <chris@zankel.net>,
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	LKML <linux-kernel@vger.kernel.org>,
	alpha <linux-alpha@vger.kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Daniel Bristot de Oliveira <bristot@redhat.com>
Subject: Re: [patch 00/13] preempt: Make preempt count unconditional
Date: Tue, 15 Sep 2020 10:29:50 -0700	[thread overview]
Message-ID: <CAHk-=wg_koVS=8bYurGCZ8zs=zDH5cOKVzFdoj4AkUWEW9mKjA@mail.gmail.com> (raw)
In-Reply-To: <87een35woz.fsf@nanos.tec.linutronix.de>

On Tue, Sep 15, 2020 at 12:24 AM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> Alternatively we just make highmem a bit more expensive by making these
> maps preemptible. RT is doing this for a long time and it's not that
> horrible.

Ack.

In fact, I've wanted to start just removing kmap support entirely. At
some point it's not so much about "I have an old machine that wants
HIGHMEM" but about "I have an old CPU, and I'll just run an old
kernel".

It's not that 32-bit is irrelevant, it's that 32-bit with large
amounts of memory is irrelevant.

Last time this was discussed, iirc the main issue was some
questionable old ARM chips that were still very common in embedded
environments, even with large memory.

But we could definitely start de-emphasizing HIGHMEM.

                     Linus
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  parent reply	other threads:[~2020-09-15 17:54 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-14 20:42 [patch 00/13] preempt: Make preempt count unconditional Thomas Gleixner
2020-09-14 20:42 ` [patch 01/13] lib/debug: Remove pointless ARCH_NO_PREEMPT dependencies Thomas Gleixner
2020-09-14 20:42 ` [patch 02/13] preempt: Make preempt count unconditional Thomas Gleixner
2020-09-14 20:42 ` [patch 03/13] preempt: Clenaup PREEMPT_COUNT leftovers Thomas Gleixner
2020-09-14 20:42 ` [patch 04/13] lockdep: " Thomas Gleixner
2020-09-15 16:11   ` Will Deacon
2020-09-14 20:42 ` [patch 05/13] mm/pagemap: " Thomas Gleixner
2020-09-14 20:42 ` [patch 06/13] locking/bitspinlock: " Thomas Gleixner
2020-09-15 16:10   ` Will Deacon
2020-09-14 20:42 ` [patch 07/13] uaccess: " Thomas Gleixner
2020-09-14 20:42 ` [patch 08/13] sched: " Thomas Gleixner
2020-09-14 20:42 ` [patch 09/13] ARM: " Thomas Gleixner
2020-09-14 20:42 ` [patch 10/13] xtensa: " Thomas Gleixner
2020-09-14 20:42 ` [patch 11/13] drm/i915: " Thomas Gleixner
2020-09-14 20:42 ` [patch 12/13] rcutorture: " Thomas Gleixner
2020-09-14 20:42 ` [patch 13/13] preempt: Remove PREEMPT_COUNT from Kconfig Thomas Gleixner
2020-09-14 20:54 ` [patch 00/13] preempt: Make preempt count unconditional Steven Rostedt
2020-09-14 20:59 ` Linus Torvalds
2020-09-14 21:55   ` Thomas Gleixner
2020-09-14 22:24     ` Linus Torvalds
2020-09-14 22:37       ` Linus Torvalds
2020-09-15  3:21         ` [PATCH] crypto: lib/chacha20poly1305 - Set SG_MITER_ATOMIC unconditionally Herbert Xu
2020-09-15  6:20         ` [patch 00/13] preempt: Make preempt count unconditional Ard Biesheuvel
2020-09-15  6:22           ` Herbert Xu
2020-09-15  6:39             ` Linus Torvalds
     [not found]               ` <87een35woz.fsf@nanos.tec.linutronix.de>
2020-09-15 17:29                 ` Linus Torvalds [this message]
     [not found]       ` <87bli75t7v.fsf@nanos.tec.linutronix.de>
2020-09-15 17:35         ` Linus Torvalds
2020-09-15 19:57           ` Thomas Gleixner
2020-09-16 18:34             ` Linus Torvalds
2020-09-16  7:37           ` Daniel Vetter
2020-09-16 15:29             ` Paul E. McKenney
2020-09-16 18:32               ` Linus Torvalds
2020-09-16 20:43                 ` Paul E. McKenney
2020-09-17  6:38                 ` Ard Biesheuvel
2020-09-16 20:29               ` Daniel Vetter
2020-09-16 20:58                 ` Paul E. McKenney
2020-09-16 21:43                   ` Daniel Vetter
2020-09-16 22:39                     ` Paul E. McKenney
2020-09-17  7:52                       ` Daniel Vetter
2020-09-17 16:28                         ` Paul E. McKenney
2020-09-29  8:19                     ` Michal Hocko
2020-09-29  8:19                       ` Michal Hocko
2020-09-29  8:20                       ` Michal Hocko
2020-09-29  8:21                       ` Michal Hocko
2020-09-29  8:23                       ` Michal Hocko
2020-09-29  9:00                       ` Daniel Vetter
2020-09-29 14:54                         ` Michal Hocko
2020-09-16 19:23     ` Matthew Wilcox
2020-09-16 20:48       ` Paul E. McKenney
2020-09-15 17:25   ` Paul E. McKenney

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