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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>,
	kernel-team@android.com
Subject: [PATCH v7 00/22] Add support for 32-bit tasks on asymmetric AArch32 systems
Date: Tue, 25 May 2021 16:14:10 +0100	[thread overview]
Message-ID: <20210525151432.16875-1-will@kernel.org> (raw)

Hi all,

Here is v7 of the asymmetric 32-bit support patches that I 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

There was also a nice LWN writeup in case you've forgotten what this is
about:

	https://lwn.net/Articles/838339/

Changes since v6 include:

  * Bug fix for a pre-existing scheduler migration bug spotted by
    Valentin (nice work!). I've put this patch at the start.

  * Prevent execve() of a 32-bit program from a 64-bit deadline task if
    the forced affinity would violate admission control

  * Fixed a memory leak and missing rcu_read_lock() spotted by Qais
    (thanks!)

  * Handle race between forcing affinity on execve() and CPU hot-unplug

  * Updated documentation

  * Introduce task_cpu_possible() macro as suggested by Peter Z

  * Added some acks/reviewed-by tags, although I didn't include these
    where patches have changed significantly since last time.

Series now based on v5.13-rc3 to avoid conflicting with arm64 cpucaps
rework merged at -rc2.

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: kernel-team@android.com

--->8

Will Deacon (22):
  sched: Favour predetermined active CPU as migration destination
  arm64: cpuinfo: Split AArch32 registers out into a separate struct
  arm64: Allow mismatched 32-bit EL0 support
  KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support
  arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  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()
  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 task_cpus_dl_admissible() to check proposed affinity
  freezer: Add frozen_or_skipped() helper function
  sched: Defer wakeup in ttwu() for unschedulable frozen tasks
  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: 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      | 154 ++++++++
 Documentation/arm64/index.rst                 |   1 +
 arch/arm64/include/asm/cpu.h                  |  44 ++-
 arch/arm64/include/asm/cpufeature.h           |   8 +-
 arch/arm64/include/asm/elf.h                  |   6 +-
 arch/arm64/include/asm/mmu_context.h          |  13 +
 arch/arm64/kernel/cpufeature.c                | 227 ++++++++---
 arch/arm64/kernel/cpuinfo.c                   |  53 +--
 arch/arm64/kernel/process.c                   |  44 ++-
 arch/arm64/kvm/arm.c                          |  11 +-
 arch/arm64/tools/cpucaps                      |   3 +-
 include/linux/cpuset.h                        |   3 +-
 include/linux/freezer.h                       |   6 +
 include/linux/mmu_context.h                   |  11 +
 include/linux/sched.h                         |  21 ++
 init/init_task.c                              |   1 +
 kernel/cgroup/cpuset.c                        |  53 ++-
 kernel/fork.c                                 |   2 +
 kernel/freezer.c                              |  10 +-
 kernel/hung_task.c                            |   4 +-
 kernel/sched/core.c                           | 351 ++++++++++++++----
 kernel/sched/sched.h                          |   1 +
 24 files changed, 850 insertions(+), 197 deletions(-)
 create mode 100644 Documentation/arm64/asymmetric-32bit.rst

-- 
2.31.1.818.g46aad6cb9e-goog


WARNING: multiple messages have this Message-ID (diff)
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>,
	kernel-team@android.com
Subject: [PATCH v7 00/22] Add support for 32-bit tasks on asymmetric AArch32 systems
Date: Tue, 25 May 2021 16:14:10 +0100	[thread overview]
Message-ID: <20210525151432.16875-1-will@kernel.org> (raw)

Hi all,

Here is v7 of the asymmetric 32-bit support patches that I 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

There was also a nice LWN writeup in case you've forgotten what this is
about:

	https://lwn.net/Articles/838339/

Changes since v6 include:

  * Bug fix for a pre-existing scheduler migration bug spotted by
    Valentin (nice work!). I've put this patch at the start.

  * Prevent execve() of a 32-bit program from a 64-bit deadline task if
    the forced affinity would violate admission control

  * Fixed a memory leak and missing rcu_read_lock() spotted by Qais
    (thanks!)

  * Handle race between forcing affinity on execve() and CPU hot-unplug

  * Updated documentation

  * Introduce task_cpu_possible() macro as suggested by Peter Z

  * Added some acks/reviewed-by tags, although I didn't include these
    where patches have changed significantly since last time.

Series now based on v5.13-rc3 to avoid conflicting with arm64 cpucaps
rework merged at -rc2.

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: kernel-team@android.com

--->8

Will Deacon (22):
  sched: Favour predetermined active CPU as migration destination
  arm64: cpuinfo: Split AArch32 registers out into a separate struct
  arm64: Allow mismatched 32-bit EL0 support
  KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support
  arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  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()
  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 task_cpus_dl_admissible() to check proposed affinity
  freezer: Add frozen_or_skipped() helper function
  sched: Defer wakeup in ttwu() for unschedulable frozen tasks
  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: 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      | 154 ++++++++
 Documentation/arm64/index.rst                 |   1 +
 arch/arm64/include/asm/cpu.h                  |  44 ++-
 arch/arm64/include/asm/cpufeature.h           |   8 +-
 arch/arm64/include/asm/elf.h                  |   6 +-
 arch/arm64/include/asm/mmu_context.h          |  13 +
 arch/arm64/kernel/cpufeature.c                | 227 ++++++++---
 arch/arm64/kernel/cpuinfo.c                   |  53 +--
 arch/arm64/kernel/process.c                   |  44 ++-
 arch/arm64/kvm/arm.c                          |  11 +-
 arch/arm64/tools/cpucaps                      |   3 +-
 include/linux/cpuset.h                        |   3 +-
 include/linux/freezer.h                       |   6 +
 include/linux/mmu_context.h                   |  11 +
 include/linux/sched.h                         |  21 ++
 init/init_task.c                              |   1 +
 kernel/cgroup/cpuset.c                        |  53 ++-
 kernel/fork.c                                 |   2 +
 kernel/freezer.c                              |  10 +-
 kernel/hung_task.c                            |   4 +-
 kernel/sched/core.c                           | 351 ++++++++++++++----
 kernel/sched/sched.h                          |   1 +
 24 files changed, 850 insertions(+), 197 deletions(-)
 create mode 100644 Documentation/arm64/asymmetric-32bit.rst

-- 
2.31.1.818.g46aad6cb9e-goog


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             reply	other threads:[~2021-05-25 15:15 UTC|newest]

Thread overview: 114+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-25 15:14 Will Deacon [this message]
2021-05-25 15:14 ` [PATCH v7 00/22] Add support for 32-bit tasks on asymmetric AArch32 systems Will Deacon
2021-05-25 15:14 ` [PATCH v7 01/22] sched: Favour predetermined active CPU as migration destination Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-26 11:14   ` Valentin Schneider
2021-05-26 11:14     ` Valentin Schneider
2021-05-26 12:32     ` Peter Zijlstra
2021-05-26 12:32       ` Peter Zijlstra
2021-05-26 12:36       ` Valentin Schneider
2021-05-26 12:36         ` Valentin Schneider
2021-05-26 16:03     ` Will Deacon
2021-05-26 16:03       ` Will Deacon
2021-05-26 17:46       ` Valentin Schneider
2021-05-26 17:46         ` Valentin Schneider
2021-05-25 15:14 ` [PATCH v7 02/22] arm64: cpuinfo: Split AArch32 registers out into a separate struct Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 03/22] arm64: Allow mismatched 32-bit EL0 support Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 04/22] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched " Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 05/22] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 06/22] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 07/22] sched: Introduce task_cpu_possible_mask() to limit fallback rq selection Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 08/22] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-26 15:02   ` Peter Zijlstra
2021-05-26 15:02     ` Peter Zijlstra
2021-05-26 16:07     ` Will Deacon
2021-05-26 16:07       ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 09/22] cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 10/22] sched: Reject CPU affinity changes based on task_cpu_possible_mask() Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-26 15:15   ` Peter Zijlstra
2021-05-26 15:15     ` Peter Zijlstra
2021-05-26 16:12     ` Will Deacon
2021-05-26 16:12       ` Will Deacon
2021-05-26 17:56       ` Peter Zijlstra
2021-05-26 17:56         ` Peter Zijlstra
2021-05-26 18:59         ` Will Deacon
2021-05-26 18:59           ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 11/22] sched: Introduce task_struct::user_cpus_ptr to track requested affinity Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 12/22] sched: Split the guts of sched_setaffinity() into a helper function Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 13/22] sched: Allow task CPU affinity to be restricted on asymmetric systems Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-26 16:20   ` Peter Zijlstra
2021-05-26 16:20     ` Peter Zijlstra
2021-05-26 16:35     ` Will Deacon
2021-05-26 16:35       ` Will Deacon
2021-05-26 16:30   ` Peter Zijlstra
2021-05-26 16:30     ` Peter Zijlstra
2021-05-26 17:02     ` Will Deacon
2021-05-26 17:02       ` Will Deacon
2021-05-27  7:56       ` Peter Zijlstra
2021-05-27  7:56         ` Peter Zijlstra
2021-05-25 15:14 ` [PATCH v7 14/22] sched: Introduce task_cpus_dl_admissible() to check proposed affinity Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 15/22] freezer: Add frozen_or_skipped() helper function Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 16/22] sched: Defer wakeup in ttwu() for unschedulable frozen tasks Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-27 14:10   ` Peter Zijlstra
2021-05-27 14:10     ` Peter Zijlstra
2021-05-27 14:31     ` Peter Zijlstra
2021-05-27 14:31       ` Peter Zijlstra
2021-05-27 14:44       ` Will Deacon
2021-05-27 14:44         ` Will Deacon
2021-05-27 14:55         ` Peter Zijlstra
2021-05-27 14:55           ` Peter Zijlstra
2021-05-27 14:50       ` Peter Zijlstra
2021-05-27 14:50         ` Peter Zijlstra
2021-05-28 10:49       ` Peter Zijlstra
2021-05-28 10:49         ` Peter Zijlstra
2021-05-27 14:36     ` Will Deacon
2021-05-27 14:36       ` Will Deacon
2021-06-01  8:21   ` [RFC][PATCH] freezer,sched: Rewrite core freezer logic Peter Zijlstra
2021-06-01  8:21     ` Peter Zijlstra
2021-06-01 11:27     ` Peter Zijlstra
2021-06-01 11:27       ` Peter Zijlstra
2021-06-02 12:54       ` Will Deacon
2021-06-02 12:54         ` Will Deacon
2021-06-03 10:35         ` Peter Zijlstra
2021-06-03 10:35           ` Peter Zijlstra
2021-06-03 10:58           ` Will Deacon
2021-06-03 10:58             ` Will Deacon
2021-06-03 11:26             ` Peter Zijlstra
2021-06-03 11:26               ` Peter Zijlstra
2021-06-03 11:36               ` Will Deacon
2021-06-03 11:36                 ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 17/22] arm64: Implement task_cpu_possible_mask() Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 18/22] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 19/22] arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 20/22] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 21/22] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 15:14 ` [PATCH v7 22/22] Documentation: arm64: describe asymmetric 32-bit support Will Deacon
2021-05-25 15:14   ` Will Deacon
2021-05-25 17:13   ` Marc Zyngier
2021-05-25 17:13     ` Marc Zyngier
2021-05-25 17:27     ` Will Deacon
2021-05-25 17:27       ` Will Deacon
2021-05-25 18:11       ` Marc Zyngier
2021-05-25 18:11         ` Marc Zyngier
2021-05-26 16:00         ` Will Deacon
2021-05-26 16:00           ` Will Deacon

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