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From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Morten Rasmussen <morten.rasmussen@arm.com>,
	Qais Yousef <qais.yousef@arm.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Quentin Perret <qperret@google.com>, Tejun Heo <tj@kernel.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Valentin Schneider <valentin.schneider@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	kernel-team@android.com
Subject: [PATCH v11 00/16] Add support for 32-bit tasks on asymmetric AArch32 systems
Date: Fri, 30 Jul 2021 12:24:27 +0100	[thread overview]
Message-ID: <20210730112443.23245-1-will@kernel.org> (raw)

Hi everyone,

This is version eleven of the patches previously posted here:

  v1: https://lore.kernel.org/r/20201027215118.27003-1-will@kernel.org
  v2: https://lore.kernel.org/r/20201109213023.15092-1-will@kernel.org
  v3: https://lore.kernel.org/r/20201113093720.21106-1-will@kernel.org
  v4: https://lore.kernel.org/r/20201124155039.13804-1-will@kernel.org
  v5: https://lore.kernel.org/r/20201208132835.6151-1-will@kernel.org
  v6: https://lore.kernel.org/r/20210518094725.7701-1-will@kernel.org
  v7: https://lore.kernel.org/r/20210525151432.16875-1-will@kernel.org
  v8: https://lore.kernel.org/r/20210602164719.31777-1-will@kernel.org
  v9: https://lore.kernel.org/r/20210608180313.11502-1-will@kernel.org
 v10: https://lore.kernel.org/r/20210623173848.318-1-will@kernel.org

The main changes since v10 are:

  * Now based on v5.14-rc1

  * Fixed a lockup found during testing where select_fallback_rq()
    could return an invalid CPU when trying to prioritise a destination
    on the same NUMA node

Greg kindly pointed out a potential issue with the new 'aarch32_el0'
file in sysfs, where the contents will be truncated if we need to
display more than a PAGE_SIZE of data. However, I have elected not to
address this for now as (a) I do not think we'll ever have hardware in
that configuration (yeah, I know...) and (b) It is useful for scripts
if the file behaves the same as the other files in the same directory
(e.g. 'online'). Should a solution to this problem emerge for the other
files, I will be happy to adopt it here as well.

This series is now mostly scheduler stuff, but the last few patches are
arm64 and so I would suggest a shared branch in -tip for merging.

Cheers,

Will

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Qais Yousef <qais.yousef@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Quentin Perret <qperret@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: kernel-team@android.com

--->8

Will Deacon (16):
  sched: Introduce task_cpu_possible_mask() to limit fallback rq
    selection
  cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1
  cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus()
  cpuset: Cleanup cpuset_cpus_allowed_fallback() use in
    select_fallback_rq()
  sched: Reject CPU affinity changes based on task_cpu_possible_mask()
  sched: Introduce task_struct::user_cpus_ptr to track requested
    affinity
  sched: Split the guts of sched_setaffinity() into a helper function
  sched: Allow task CPU affinity to be restricted on asymmetric systems
  sched: Introduce dl_task_check_affinity() to check proposed affinity
  arm64: Implement task_cpu_possible_mask()
  arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit
    EL0
  arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched
    system
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0
  arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores
  Documentation: arm64: describe asymmetric 32-bit support

 .../ABI/testing/sysfs-devices-system-cpu      |   9 +
 .../admin-guide/kernel-parameters.txt         |  11 +
 Documentation/arm64/asymmetric-32bit.rst      | 155 ++++++++
 Documentation/arm64/index.rst                 |   1 +
 arch/arm64/include/asm/elf.h                  |   6 +-
 arch/arm64/include/asm/mmu_context.h          |  13 +
 arch/arm64/kernel/cpufeature.c                |  51 ++-
 arch/arm64/kernel/process.c                   |  47 ++-
 arch/arm64/kernel/signal.c                    |  26 --
 include/linux/cpuset.h                        |   8 +-
 include/linux/mmu_context.h                   |  14 +
 include/linux/sched.h                         |  21 ++
 init/init_task.c                              |   1 +
 kernel/cgroup/cpuset.c                        |  59 ++-
 kernel/fork.c                                 |   2 +
 kernel/sched/core.c                           | 344 ++++++++++++++----
 kernel/sched/sched.h                          |   1 +
 17 files changed, 628 insertions(+), 141 deletions(-)
 create mode 100644 Documentation/arm64/asymmetric-32bit.rst

-- 
2.32.0.402.g57bb445576-goog


WARNING: multiple messages have this Message-ID
From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Morten Rasmussen <morten.rasmussen@arm.com>,
	Qais Yousef <qais.yousef@arm.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Quentin Perret <qperret@google.com>, Tejun Heo <tj@kernel.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Valentin Schneider <valentin.schneider@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	kernel-team@android.com
Subject: [PATCH v11 00/16] Add support for 32-bit tasks on asymmetric AArch32 systems
Date: Fri, 30 Jul 2021 12:24:27 +0100	[thread overview]
Message-ID: <20210730112443.23245-1-will@kernel.org> (raw)

Hi everyone,

This is version eleven of the patches previously posted here:

  v1: https://lore.kernel.org/r/20201027215118.27003-1-will@kernel.org
  v2: https://lore.kernel.org/r/20201109213023.15092-1-will@kernel.org
  v3: https://lore.kernel.org/r/20201113093720.21106-1-will@kernel.org
  v4: https://lore.kernel.org/r/20201124155039.13804-1-will@kernel.org
  v5: https://lore.kernel.org/r/20201208132835.6151-1-will@kernel.org
  v6: https://lore.kernel.org/r/20210518094725.7701-1-will@kernel.org
  v7: https://lore.kernel.org/r/20210525151432.16875-1-will@kernel.org
  v8: https://lore.kernel.org/r/20210602164719.31777-1-will@kernel.org
  v9: https://lore.kernel.org/r/20210608180313.11502-1-will@kernel.org
 v10: https://lore.kernel.org/r/20210623173848.318-1-will@kernel.org

The main changes since v10 are:

  * Now based on v5.14-rc1

  * Fixed a lockup found during testing where select_fallback_rq()
    could return an invalid CPU when trying to prioritise a destination
    on the same NUMA node

Greg kindly pointed out a potential issue with the new 'aarch32_el0'
file in sysfs, where the contents will be truncated if we need to
display more than a PAGE_SIZE of data. However, I have elected not to
address this for now as (a) I do not think we'll ever have hardware in
that configuration (yeah, I know...) and (b) It is useful for scripts
if the file behaves the same as the other files in the same directory
(e.g. 'online'). Should a solution to this problem emerge for the other
files, I will be happy to adopt it here as well.

This series is now mostly scheduler stuff, but the last few patches are
arm64 and so I would suggest a shared branch in -tip for merging.

Cheers,

Will

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Qais Yousef <qais.yousef@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Quentin Perret <qperret@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: kernel-team@android.com

--->8

Will Deacon (16):
  sched: Introduce task_cpu_possible_mask() to limit fallback rq
    selection
  cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1
  cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus()
  cpuset: Cleanup cpuset_cpus_allowed_fallback() use in
    select_fallback_rq()
  sched: Reject CPU affinity changes based on task_cpu_possible_mask()
  sched: Introduce task_struct::user_cpus_ptr to track requested
    affinity
  sched: Split the guts of sched_setaffinity() into a helper function
  sched: Allow task CPU affinity to be restricted on asymmetric systems
  sched: Introduce dl_task_check_affinity() to check proposed affinity
  arm64: Implement task_cpu_possible_mask()
  arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit
    EL0
  arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched
    system
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0
  arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores
  Documentation: arm64: describe asymmetric 32-bit support

 .../ABI/testing/sysfs-devices-system-cpu      |   9 +
 .../admin-guide/kernel-parameters.txt         |  11 +
 Documentation/arm64/asymmetric-32bit.rst      | 155 ++++++++
 Documentation/arm64/index.rst                 |   1 +
 arch/arm64/include/asm/elf.h                  |   6 +-
 arch/arm64/include/asm/mmu_context.h          |  13 +
 arch/arm64/kernel/cpufeature.c                |  51 ++-
 arch/arm64/kernel/process.c                   |  47 ++-
 arch/arm64/kernel/signal.c                    |  26 --
 include/linux/cpuset.h                        |   8 +-
 include/linux/mmu_context.h                   |  14 +
 include/linux/sched.h                         |  21 ++
 init/init_task.c                              |   1 +
 kernel/cgroup/cpuset.c                        |  59 ++-
 kernel/fork.c                                 |   2 +
 kernel/sched/core.c                           | 344 ++++++++++++++----
 kernel/sched/sched.h                          |   1 +
 17 files changed, 628 insertions(+), 141 deletions(-)
 create mode 100644 Documentation/arm64/asymmetric-32bit.rst

-- 
2.32.0.402.g57bb445576-goog


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             reply	other threads:[~2021-07-30 11:24 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 11:24 Will Deacon [this message]
2021-07-30 11:24 ` Will Deacon
2021-07-30 11:24 ` [PATCH v11 01/16] sched: Introduce task_cpu_possible_mask() to limit fallback rq selection Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-08-23  9:26   ` [tip: sched/core] " tip-bot2 for Will Deacon
2021-07-30 11:24 ` [PATCH v11 02/16] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-08-23  9:26   ` [tip: sched/core] " tip-bot2 for Will Deacon
2021-07-30 11:24 ` [PATCH v11 03/16] cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-08-23  9:26   ` [tip: sched/core] " tip-bot2 for Will Deacon
2021-07-30 11:24 ` [PATCH v11 04/16] cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq() Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-08-23  9:26   ` [tip: sched/core] " tip-bot2 for Will Deacon
2021-07-30 11:24 ` [PATCH v11 05/16] sched: Reject CPU affinity changes based on task_cpu_possible_mask() Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-08-23  9:26   ` [tip: sched/core] " tip-bot2 for Will Deacon
2021-07-30 11:24 ` [PATCH v11 06/16] sched: Introduce task_struct::user_cpus_ptr to track requested affinity Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-08-23  9:26   ` [tip: sched/core] " tip-bot2 for Will Deacon
2021-07-30 11:24 ` [PATCH v11 07/16] sched: Split the guts of sched_setaffinity() into a helper function Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-08-17 15:40   ` Peter Zijlstra
2021-08-17 15:40     ` Peter Zijlstra
2021-08-18 10:50     ` Will Deacon
2021-08-18 10:50       ` Will Deacon
2021-08-18 10:56       ` Peter Zijlstra
2021-08-18 10:56         ` Peter Zijlstra
2021-08-18 11:11         ` Will Deacon
2021-08-18 11:11           ` Will Deacon
2021-08-23  9:26   ` [tip: sched/core] " tip-bot2 for Will Deacon
2021-07-30 11:24 ` [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-08-17 15:10   ` Peter Zijlstra
2021-08-17 15:10     ` Peter Zijlstra
2021-08-18 10:42     ` Will Deacon
2021-08-18 10:42       ` Will Deacon
2021-08-18 10:56       ` Peter Zijlstra
2021-08-18 10:56         ` Peter Zijlstra
2021-08-18 11:53         ` Peter Zijlstra
2021-08-18 11:53           ` Peter Zijlstra
2021-08-18 12:19           ` Will Deacon
2021-08-18 12:19             ` Will Deacon
2021-08-18 11:06       ` Peter Zijlstra
2021-08-18 11:06         ` Peter Zijlstra
2021-08-17 15:41   ` Peter Zijlstra
2021-08-17 15:41     ` Peter Zijlstra
2021-08-18 10:43     ` Will Deacon
2021-08-18 10:43       ` Will Deacon
2021-08-23  9:26   ` [tip: sched/core] " tip-bot2 for Will Deacon
2021-07-30 11:24 ` [PATCH v11 09/16] sched: Introduce dl_task_check_affinity() to check proposed affinity Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-08-23  9:26   ` [tip: sched/core] " tip-bot2 for Will Deacon
2021-07-30 11:24 ` [PATCH v11 10/16] arm64: Implement task_cpu_possible_mask() Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-07-30 11:24 ` [PATCH v11 11/16] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-07-30 11:24 ` [PATCH v11 12/16] arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-07-30 11:24 ` [PATCH v11 13/16] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-07-30 11:24 ` [PATCH v11 14/16] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-07-30 11:24 ` [PATCH v11 15/16] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Will Deacon
2021-07-30 11:24   ` Will Deacon
2021-07-30 11:24 ` [PATCH v11 16/16] Documentation: arm64: describe asymmetric 32-bit support Will Deacon
2021-07-30 11:24   ` Will Deacon

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