From: David Laight <David.Laight@ACULAB.COM>
To: 'Linus Torvalds' <torvalds@linux-foundation.org>,
"John Paul Adrian Glaubitz" <glaubitz@physik.fu-berlin.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
Matthew Wilcox <willy@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ankur Arora <ankur.a.arora@oracle.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"x86@kernel.org" <x86@kernel.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"luto@kernel.org" <luto@kernel.org>,
"bp@alien8.de" <bp@alien8.de>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"hpa@zytor.com" <hpa@zytor.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"juri.lelli@redhat.com" <juri.lelli@redhat.com>,
"vincent.guittot@linaro.org" <vincent.guittot@linaro.org>,
"mgorman@suse.de" <mgorman@suse.de>,
"rostedt@goodmis.org" <rostedt@goodmis.org>,
"jon.grimm@amd.com" <jon.grimm@amd.com>,
"bharata@amd.com" <bharata@amd.com>,
"raghavendra.kt@amd.com" <raghavendra.kt@amd.com>,
"boris.ostrovsky@oracle.com" <boris.ostrovsky@oracle.com>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
"jgross@suse.com" <jgross@suse.com>,
"andrew.cooper3@citrix.com" <andrew.cooper3@citrix.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
"linux-m68k@lists.linux-m68k.org"
<linux-m68k@lists.linux-m68k.org>,
Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>,
Johannes Berg <johannes@sipsolutions.net>,
"linux-um@lists.infradead.org" <linux-um@lists.infradead.org>,
Brian Cain <bcain@quicinc.com>,
"linux-hexagon@vger.kernel.org" <linux-hexagon@vger.kernel.org>,
"Richard Henderson" <richard.henderson@linaro.org>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
Matt Turner <mattst88@gmail.com>,
"linux-alpha@vger.kernel.org" <linux-alpha@vger.kernel.org>
Subject: RE: Arches that don't support PREEMPT
Date: Wed, 20 Sep 2023 10:37:42 +0000 [thread overview]
Message-ID: <c3d5937c27824f7f879012cdeb876a14@AcuMS.aculab.com> (raw)
In-Reply-To: <CAHk-=wgUimqtF7PqFfRw4Ju5H1KYkp6+8F=hBz7amGQ8GaGKkA@mail.gmail.com>
From: Linus Torvalds
> Sent: 19 September 2023 18:25
>
> On Tue, 19 Sept 2023 at 06:48, John Paul Adrian Glaubitz
> <glaubitz@physik.fu-berlin.de> wrote:
> >
> > As Geert poined out, I'm not seeing anything particular problematic with the
> > architectures lacking CONFIG_PREEMPT at the moment. This seems to be more
> > something about organizing KConfig files.
>
> It can definitely be problematic.
>
> Not the Kconfig file part, and not the preempt count part itself.
>
> But the fact that it has never been used and tested means that there
> might be tons of "this architecture code knows it's not preemptible,
> because this architecture doesn't support preemption".
Do distos even build x86 kernels with PREEMPT_FULL?
I know I've had issues with massive latencies caused graphics driver
forcing write-backs of all the framebuffer memory.
(I think it is a failed attempt to fix a temporary display corruption.)
OTOH SMP support and CONFIG_RT will test most of the code.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2023-09-20 10:37 UTC|newest]
Thread overview: 152+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-30 18:49 [PATCH v2 0/9] x86/clear_huge_page: multi-page clearing Ankur Arora
2023-08-30 18:49 ` [PATCH v2 1/9] mm/clear_huge_page: allow arch override for clear_huge_page() Ankur Arora
2023-08-30 18:49 ` [PATCH v2 2/9] mm/huge_page: separate clear_huge_page() and copy_huge_page() Ankur Arora
2023-08-30 18:49 ` [PATCH v2 3/9] mm/huge_page: cleanup clear_/copy_subpage() Ankur Arora
2023-09-08 13:09 ` Matthew Wilcox
2023-09-11 17:22 ` Ankur Arora
2023-08-30 18:49 ` [PATCH v2 4/9] x86/clear_page: extend clear_page*() for multi-page clearing Ankur Arora
2023-09-08 13:11 ` Matthew Wilcox
2023-08-30 18:49 ` [PATCH v2 5/9] x86/clear_page: add clear_pages() Ankur Arora
2023-08-30 18:49 ` [PATCH v2 6/9] x86/clear_huge_page: multi-page clearing Ankur Arora
2023-08-31 18:26 ` kernel test robot
2023-09-08 12:38 ` Peter Zijlstra
2023-09-13 6:43 ` Raghavendra K T
2023-08-30 18:49 ` [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED Ankur Arora
2023-09-08 7:02 ` Peter Zijlstra
2023-09-08 17:15 ` Linus Torvalds
2023-09-08 22:50 ` Peter Zijlstra
2023-09-09 5:15 ` Linus Torvalds
2023-09-09 6:39 ` Ankur Arora
2023-09-09 9:11 ` Peter Zijlstra
2023-09-09 20:04 ` Ankur Arora
2023-09-09 5:30 ` Ankur Arora
2023-09-09 9:12 ` Peter Zijlstra
2023-09-09 20:15 ` Ankur Arora
2023-09-09 21:16 ` Linus Torvalds
2023-09-10 3:48 ` Ankur Arora
2023-09-10 4:35 ` Linus Torvalds
2023-09-10 10:01 ` Ankur Arora
2023-09-10 18:32 ` Linus Torvalds
2023-09-11 15:04 ` Peter Zijlstra
2023-09-11 16:29 ` andrew.cooper3
2023-09-11 17:04 ` Ankur Arora
2023-09-12 8:26 ` Peter Zijlstra
2023-09-12 12:24 ` Phil Auld
2023-09-12 12:33 ` Matthew Wilcox
2023-09-18 23:42 ` Thomas Gleixner
2023-09-19 1:57 ` Linus Torvalds
2023-09-19 8:03 ` Ingo Molnar
2023-09-19 8:43 ` Ingo Molnar
2023-09-19 13:43 ` Thomas Gleixner
2023-09-19 13:25 ` Thomas Gleixner
2023-09-19 12:30 ` Thomas Gleixner
2023-09-19 13:00 ` Arches that don't support PREEMPT Matthew Wilcox
2023-09-19 13:34 ` Geert Uytterhoeven
2023-09-19 13:37 ` John Paul Adrian Glaubitz
2023-09-19 13:42 ` Peter Zijlstra
2023-09-19 13:48 ` John Paul Adrian Glaubitz
2023-09-19 14:16 ` Peter Zijlstra
2023-09-19 14:24 ` John Paul Adrian Glaubitz
2023-09-19 14:32 ` Matthew Wilcox
2023-09-19 15:31 ` Steven Rostedt
2023-09-20 14:38 ` Anton Ivanov
2023-09-21 12:20 ` Arnd Bergmann
2023-09-19 14:17 ` Thomas Gleixner
2023-09-19 14:50 ` H. Peter Anvin
2023-09-19 14:57 ` Matt Turner
2023-09-19 17:09 ` Ulrich Teichert
2023-09-19 17:25 ` Linus Torvalds
2023-09-19 17:58 ` John Paul Adrian Glaubitz
2023-09-19 18:31 ` Thomas Gleixner
2023-09-19 18:38 ` Steven Rostedt
2023-09-19 18:52 ` Linus Torvalds
2023-09-19 19:53 ` Thomas Gleixner
2023-09-20 7:32 ` Ingo Molnar
2023-09-20 7:29 ` Ingo Molnar
2023-09-20 8:26 ` Thomas Gleixner
2023-09-20 10:37 ` David Laight [this message]
2023-09-19 14:21 ` Anton Ivanov
2023-09-19 15:17 ` Thomas Gleixner
2023-09-19 15:21 ` Anton Ivanov
2023-09-19 16:22 ` Richard Weinberger
2023-09-19 16:41 ` Anton Ivanov
2023-09-19 17:33 ` Thomas Gleixner
2023-10-06 14:51 ` Geert Uytterhoeven
2023-09-20 14:22 ` [PATCH v2 7/9] sched: define TIF_ALLOW_RESCHED Ankur Arora
2023-09-20 20:51 ` Thomas Gleixner
2023-09-21 0:14 ` Thomas Gleixner
2023-09-21 0:58 ` Ankur Arora
2023-09-21 2:12 ` Thomas Gleixner
2023-09-20 23:58 ` Thomas Gleixner
2023-09-21 0:57 ` Ankur Arora
2023-09-21 2:02 ` Thomas Gleixner
2023-09-21 4:16 ` Ankur Arora
2023-09-21 13:59 ` Steven Rostedt
2023-09-21 16:00 ` Linus Torvalds
2023-09-21 22:55 ` Thomas Gleixner
2023-09-23 1:11 ` Thomas Gleixner
2023-10-02 14:15 ` Steven Rostedt
2023-10-02 16:13 ` Thomas Gleixner
2023-10-18 1:03 ` Paul E. McKenney
2023-10-18 12:09 ` Ankur Arora
2023-10-18 17:51 ` Paul E. McKenney
2023-10-18 22:53 ` Thomas Gleixner
2023-10-18 23:25 ` Paul E. McKenney
2023-10-18 13:16 ` Thomas Gleixner
2023-10-18 14:31 ` Steven Rostedt
2023-10-18 17:55 ` Paul E. McKenney
2023-10-18 18:00 ` Steven Rostedt
2023-10-18 18:13 ` Paul E. McKenney
2023-10-19 12:37 ` Daniel Bristot de Oliveira
2023-10-19 17:08 ` Paul E. McKenney
2023-10-18 17:19 ` Paul E. McKenney
2023-10-18 17:41 ` Steven Rostedt
2023-10-18 17:59 ` Paul E. McKenney
2023-10-18 20:15 ` Ankur Arora
2023-10-18 20:42 ` Paul E. McKenney
2023-10-19 0:21 ` Thomas Gleixner
2023-10-19 19:13 ` Paul E. McKenney
2023-10-20 21:59 ` Paul E. McKenney
2023-10-20 22:56 ` Ankur Arora
2023-10-20 23:36 ` Paul E. McKenney
2023-10-21 1:05 ` Ankur Arora
2023-10-21 2:08 ` Paul E. McKenney
2023-10-24 12:15 ` Thomas Gleixner
2023-10-24 18:59 ` Paul E. McKenney
2023-09-23 22:50 ` Thomas Gleixner
2023-09-24 0:10 ` Thomas Gleixner
2023-09-24 7:19 ` Matthew Wilcox
2023-09-24 7:55 ` Thomas Gleixner
2023-09-24 10:29 ` Matthew Wilcox
2023-09-25 0:13 ` Ankur Arora
2023-10-06 13:01 ` Geert Uytterhoeven
2023-09-19 7:21 ` Ingo Molnar
2023-09-19 19:05 ` Ankur Arora
2023-10-24 14:34 ` Steven Rostedt
2023-10-25 1:49 ` Steven Rostedt
2023-10-26 7:50 ` Sergey Senozhatsky
2023-10-26 12:48 ` Steven Rostedt
2023-09-11 16:48 ` Steven Rostedt
2023-09-11 20:50 ` Linus Torvalds
2023-09-11 21:16 ` Linus Torvalds
2023-09-12 7:20 ` Peter Zijlstra
2023-09-12 7:38 ` Ingo Molnar
2023-09-11 22:20 ` Steven Rostedt
2023-09-11 23:10 ` Ankur Arora
2023-09-11 23:16 ` Steven Rostedt
2023-09-12 16:30 ` Linus Torvalds
2023-09-12 3:27 ` Matthew Wilcox
2023-09-12 16:20 ` Linus Torvalds
2023-09-19 3:21 ` Andy Lutomirski
2023-09-19 9:20 ` Thomas Gleixner
2023-09-19 9:49 ` Ingo Molnar
2023-08-30 18:49 ` [PATCH v2 8/9] irqentry: define irqentry_exit_allow_resched() Ankur Arora
2023-09-08 12:42 ` Peter Zijlstra
2023-09-11 17:24 ` Ankur Arora
2023-08-30 18:49 ` [PATCH v2 9/9] x86/clear_huge_page: make clear_contig_region() preemptible Ankur Arora
2023-09-08 12:45 ` Peter Zijlstra
2023-09-03 8:14 ` [PATCH v2 0/9] x86/clear_huge_page: multi-page clearing Mateusz Guzik
2023-09-05 22:14 ` Ankur Arora
2023-09-08 2:18 ` Raghavendra K T
2023-09-05 1:06 ` Raghavendra K T
2023-09-05 19:36 ` Ankur Arora
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=c3d5937c27824f7f879012cdeb876a14@AcuMS.aculab.com \
--to=david.laight@aculab.com \
--cc=akpm@linux-foundation.org \
--cc=andrew.cooper3@citrix.com \
--cc=ankur.a.arora@oracle.com \
--cc=anton.ivanov@cambridgegreys.com \
--cc=bcain@quicinc.com \
--cc=bharata@amd.com \
--cc=boris.ostrovsky@oracle.com \
--cc=bp@alien8.de \
--cc=dave.hansen@linux.intel.com \
--cc=geert@linux-m68k.org \
--cc=glaubitz@physik.fu-berlin.de \
--cc=hpa@zytor.com \
--cc=ink@jurassic.park.msu.ru \
--cc=jgross@suse.com \
--cc=johannes@sipsolutions.net \
--cc=jon.grimm@amd.com \
--cc=juri.lelli@redhat.com \
--cc=konrad.wilk@oracle.com \
--cc=linux-alpha@vger.kernel.org \
--cc=linux-hexagon@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-m68k@lists.linux-m68k.org \
--cc=linux-mm@kvack.org \
--cc=linux-um@lists.infradead.org \
--cc=luto@kernel.org \
--cc=mattst88@gmail.com \
--cc=mgorman@suse.de \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=raghavendra.kt@amd.com \
--cc=richard.henderson@linaro.org \
--cc=richard@nod.at \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=vincent.guittot@linaro.org \
--cc=willy@infradead.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).