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From: Anton Ivanov <anton.ivanov@cambridgegreys.com>
To: Peter Zijlstra <peterz@infradead.org>,
	John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Matthew Wilcox <willy@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Ankur Arora <ankur.a.arora@oracle.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org,
	akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de,
	dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com,
	juri.lelli@redhat.com, vincent.guittot@linaro.org,
	mgorman@suse.de, rostedt@goodmis.org, jon.grimm@amd.com,
	bharata@amd.com, raghavendra.kt@amd.com,
	boris.ostrovsky@oracle.com, konrad.wilk@oracle.com,
	jgross@suse.com, andrew.cooper3@citrix.com,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	linux-m68k@lists.linux-m68k.org,
	Richard Weinberger <richard@nod.at>,
	Johannes Berg <johannes@sipsolutions.net>,
	linux-um@lists.infradead.org, Brian Cain <bcain@quicinc.com>,
	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
Subject: Re: Arches that don't support PREEMPT
Date: Tue, 19 Sep 2023 15:21:39 +0100	[thread overview]
Message-ID: <bd664a61-4506-bab0-19c3-0011f57005b5@cambridgegreys.com> (raw)
In-Reply-To: <20230919134218.GA39281@noisy.programming.kicks-ass.net>



On 19/09/2023 14:42, Peter Zijlstra wrote:
> On Tue, Sep 19, 2023 at 03:37:24PM +0200, John Paul Adrian Glaubitz wrote:
>> On Tue, 2023-09-19 at 14:00 +0100, Matthew Wilcox wrote:
>>> On Tue, Sep 19, 2023 at 02:30:59PM +0200, Thomas Gleixner wrote:
>>>> Though it just occured to me that there are dragons lurking:
>>>>
>>>> arch/alpha/Kconfig:     select ARCH_NO_PREEMPT
>>>> arch/hexagon/Kconfig:   select ARCH_NO_PREEMPT
>>>> arch/m68k/Kconfig:      select ARCH_NO_PREEMPT if !COLDFIRE
>>>> arch/um/Kconfig:        select ARCH_NO_PREEMPT
>>>
>>> Sounds like three-and-a-half architectures which could be queued up for
>>> removal right behind ia64 ...
>>
>> The agreement to kill off ia64 wasn't an invitation to kill off other stuff
>> that people are still working on! Can we please not do this?
> 
> If you're working on one of them, then surely it's a simple matter of
> working on adding CONFIG_PREEMPT support :-)

In the case of UML adding preempt will be quite difficult. I looked at this a few years back.

At the same time it is used for kernel test and other stuff. It is not exactly abandonware on a CPU found in archaeological artifacts of past civilizations like ia64.

> 
> _______________________________________________
> linux-um mailing list
> linux-um@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-um
> 

-- 
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/

WARNING: multiple messages have this Message-ID (diff)
From: Anton Ivanov <anton.ivanov@cambridgegreys.com>
To: Peter Zijlstra <peterz@infradead.org>,
	John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Matthew Wilcox <willy@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Ankur Arora <ankur.a.arora@oracle.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org,
	akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de,
	dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com,
	juri.lelli@redhat.com, vincent.guittot@linaro.org,
	mgorman@suse.de, rostedt@goodmis.org, jon.grimm@amd.com,
	bharata@amd.com, raghavendra.kt@amd.com,
	boris.ostrovsky@oracle.com, konrad.wilk@oracle.com,
	jgross@suse.com, andrew.cooper3@citrix.com,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	linux-m68k@lists.linux-m68k.org,
	Richard Weinberger <richard@nod.at>,
	Johannes Berg <johannes@sipsolutions.net>,
	linux-um@lists.infradead.org, Brian Cain <bcain@quicinc.com>,
	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
Subject: Re: Arches that don't support PREEMPT
Date: Tue, 19 Sep 2023 15:21:39 +0100	[thread overview]
Message-ID: <bd664a61-4506-bab0-19c3-0011f57005b5@cambridgegreys.com> (raw)
In-Reply-To: <20230919134218.GA39281@noisy.programming.kicks-ass.net>



On 19/09/2023 14:42, Peter Zijlstra wrote:
> On Tue, Sep 19, 2023 at 03:37:24PM +0200, John Paul Adrian Glaubitz wrote:
>> On Tue, 2023-09-19 at 14:00 +0100, Matthew Wilcox wrote:
>>> On Tue, Sep 19, 2023 at 02:30:59PM +0200, Thomas Gleixner wrote:
>>>> Though it just occured to me that there are dragons lurking:
>>>>
>>>> arch/alpha/Kconfig:     select ARCH_NO_PREEMPT
>>>> arch/hexagon/Kconfig:   select ARCH_NO_PREEMPT
>>>> arch/m68k/Kconfig:      select ARCH_NO_PREEMPT if !COLDFIRE
>>>> arch/um/Kconfig:        select ARCH_NO_PREEMPT
>>>
>>> Sounds like three-and-a-half architectures which could be queued up for
>>> removal right behind ia64 ...
>>
>> The agreement to kill off ia64 wasn't an invitation to kill off other stuff
>> that people are still working on! Can we please not do this?
> 
> If you're working on one of them, then surely it's a simple matter of
> working on adding CONFIG_PREEMPT support :-)

In the case of UML adding preempt will be quite difficult. I looked at this a few years back.

At the same time it is used for kernel test and other stuff. It is not exactly abandonware on a CPU found in archaeological artifacts of past civilizations like ia64.

> 
> _______________________________________________
> linux-um mailing list
> linux-um@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-um
> 

-- 
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/

_______________________________________________
linux-um mailing list
linux-um@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-um

WARNING: multiple messages have this Message-ID (diff)
From: Anton Ivanov <anton.ivanov@cambridgegreys.com>
To: Peter Zijlstra <peterz@infradead.org>,
	John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Matthew Wilcox <willy@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Ankur Arora <ankur.a.arora@oracle.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org,
	akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de,
	dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com,
	juri.lelli@redhat.com, vincent.guittot@linaro.org,
	mgorman@suse.de, rostedt@goodmis.org, jon.grimm@amd.com,
	bharata@amd.com, raghavendra.kt@amd.com,
	boris.ostrovsky@oracle.com, konrad.wilk@oracle.com,
	jgross@suse.com, andrew.cooper3@citrix.com,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	linux-m68k@lists.linux-m68k.org,
	Richard Weinberger <richard@nod.at>,
	Johannes Berg <johannes@sipsolutions.net>,
	linux-um@lists.infradead.
Subject: Re: Arches that don't support PREEMPT
Date: Tue, 19 Sep 2023 15:21:39 +0100	[thread overview]
Message-ID: <bd664a61-4506-bab0-19c3-0011f57005b5@cambridgegreys.com> (raw)
In-Reply-To: <20230919134218.GA39281@noisy.programming.kicks-ass.net>



On 19/09/2023 14:42, Peter Zijlstra wrote:
> On Tue, Sep 19, 2023 at 03:37:24PM +0200, John Paul Adrian Glaubitz wrote:
>> On Tue, 2023-09-19 at 14:00 +0100, Matthew Wilcox wrote:
>>> On Tue, Sep 19, 2023 at 02:30:59PM +0200, Thomas Gleixner wrote:
>>>> Though it just occured to me that there are dragons lurking:
>>>>
>>>> arch/alpha/Kconfig:     select ARCH_NO_PREEMPT
>>>> arch/hexagon/Kconfig:   select ARCH_NO_PREEMPT
>>>> arch/m68k/Kconfig:      select ARCH_NO_PREEMPT if !COLDFIRE
>>>> arch/um/Kconfig:        select ARCH_NO_PREEMPT
>>>
>>> Sounds like three-and-a-half architectures which could be queued up for
>>> removal right behind ia64 ...
>>
>> The agreement to kill off ia64 wasn't an invitation to kill off other stuff
>> that people are still working on! Can we please not do this?
> 
> If you're working on one of them, then surely it's a simple matter of
> working on adding CONFIG_PREEMPT support :-)

In the case of UML adding preempt will be quite difficult. I looked at this a few years back.

At the same time it is used for kernel test and other stuff. It is not exactly abandonware on a CPU found in archaeological artifacts of past civilizations like ia64.

> 
> _______________________________________________
> linux-um mailing list
> linux-um@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-um
> 

-- 
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/

  parent reply	other threads:[~2023-09-19 14:22 UTC|newest]

Thread overview: 214+ 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 13:00                               ` Matthew Wilcox
2023-09-19 13:00                               ` Matthew Wilcox
2023-09-19 13:34                               ` Geert Uytterhoeven
2023-09-19 13:34                                 ` Geert Uytterhoeven
2023-09-19 13:34                                 ` Geert Uytterhoeven
2023-09-19 13:37                               ` John Paul Adrian Glaubitz
2023-09-19 13:37                                 ` John Paul Adrian Glaubitz
2023-09-19 13:37                                 ` John Paul Adrian Glaubitz
2023-09-19 13:42                                 ` Peter Zijlstra
2023-09-19 13:42                                   ` Peter Zijlstra
2023-09-19 13:42                                   ` Peter Zijlstra
2023-09-19 13:48                                   ` John Paul Adrian Glaubitz
2023-09-19 13:48                                     ` John Paul Adrian Glaubitz
2023-09-19 13:48                                     ` John Paul Adrian Glaubitz
2023-09-19 14:16                                     ` Peter Zijlstra
2023-09-19 14:16                                       ` Peter Zijlstra
2023-09-19 14:16                                       ` Peter Zijlstra
2023-09-19 14:24                                       ` John Paul Adrian Glaubitz
2023-09-19 14:24                                         ` John Paul Adrian Glaubitz
2023-09-19 14:24                                         ` John Paul Adrian Glaubitz
2023-09-19 14:32                                         ` Matthew Wilcox
2023-09-19 14:32                                           ` Matthew Wilcox
2023-09-19 14:32                                           ` Matthew Wilcox
2023-09-19 15:31                                           ` Steven Rostedt
2023-09-19 15:31                                             ` Steven Rostedt
2023-09-19 15:31                                             ` Steven Rostedt
2023-09-20 14:38                                       ` Anton Ivanov
2023-09-20 14:38                                         ` Anton Ivanov
2023-09-20 14:38                                         ` Anton Ivanov
2023-09-21 12:20                                       ` Arnd Bergmann
2023-09-21 12:20                                         ` Arnd Bergmann
2023-09-21 12:20                                         ` Arnd Bergmann
2023-09-19 14:17                                     ` Thomas Gleixner
2023-09-19 14:17                                       ` Thomas Gleixner
2023-09-19 14:17                                       ` Thomas Gleixner
2023-09-19 14:50                                       ` H. Peter Anvin
2023-09-19 14:50                                         ` H. Peter Anvin
2023-09-19 14:50                                         ` H. Peter Anvin
2023-09-19 14:57                                         ` Matt Turner
2023-09-19 14:57                                           ` Matt Turner
2023-09-19 14:57                                           ` Matt Turner
2023-09-19 17:09                                         ` Ulrich Teichert
2023-09-19 17:09                                           ` Ulrich Teichert
2023-09-19 17:25                                     ` Linus Torvalds
2023-09-19 17:25                                       ` Linus Torvalds
2023-09-19 17:25                                       ` Linus Torvalds
2023-09-19 17:58                                       ` John Paul Adrian Glaubitz
2023-09-19 17:58                                         ` John Paul Adrian Glaubitz
2023-09-19 17:58                                         ` John Paul Adrian Glaubitz
2023-09-19 18:31                                       ` Thomas Gleixner
2023-09-19 18:31                                         ` Thomas Gleixner
2023-09-19 18:31                                         ` Thomas Gleixner
2023-09-19 18:38                                         ` Steven Rostedt
2023-09-19 18:38                                           ` Steven Rostedt
2023-09-19 18:38                                           ` Steven Rostedt
2023-09-19 18:52                                           ` Linus Torvalds
2023-09-19 18:52                                             ` Linus Torvalds
2023-09-19 18:52                                             ` Linus Torvalds
2023-09-19 19:53                                             ` Thomas Gleixner
2023-09-19 19:53                                               ` Thomas Gleixner
2023-09-19 19:53                                               ` Thomas Gleixner
2023-09-20  7:32                                           ` Ingo Molnar
2023-09-20  7:32                                             ` Ingo Molnar
2023-09-20  7:32                                             ` Ingo Molnar
2023-09-20  7:29                                         ` Ingo Molnar
2023-09-20  7:29                                           ` Ingo Molnar
2023-09-20  7:29                                           ` Ingo Molnar
2023-09-20  8:26                                       ` Thomas Gleixner
2023-09-20  8:26                                         ` Thomas Gleixner
2023-09-20  8:26                                         ` Thomas Gleixner
2023-09-20 10:37                                       ` David Laight
2023-09-20 10:37                                         ` David Laight
2023-09-20 10:37                                         ` David Laight
2023-09-19 14:21                                   ` Anton Ivanov [this message]
2023-09-19 14:21                                     ` Anton Ivanov
2023-09-19 14:21                                     ` Anton Ivanov
2023-09-19 15:17                                     ` Thomas Gleixner
2023-09-19 15:17                                       ` Thomas Gleixner
2023-09-19 15:17                                       ` Thomas Gleixner
2023-09-19 15:21                                       ` Anton Ivanov
2023-09-19 15:21                                         ` Anton Ivanov
2023-09-19 15:21                                         ` Anton Ivanov
2023-09-19 16:22                                         ` Richard Weinberger
2023-09-19 16:22                                           ` Richard Weinberger
2023-09-19 16:22                                           ` Richard Weinberger
2023-09-19 16:41                                           ` Anton Ivanov
2023-09-19 16:41                                             ` Anton Ivanov
2023-09-19 16:41                                             ` Anton Ivanov
2023-09-19 17:33                                             ` Thomas Gleixner
2023-09-19 17:33                                               ` Thomas Gleixner
2023-09-19 17:33                                               ` Thomas Gleixner
2023-10-06 14:51                               ` Geert Uytterhoeven
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

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