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* [PATCH v11 00/16] Add support for 32-bit tasks on asymmetric AArch32 systems
@ 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
                   ` (15 more replies)
  0 siblings, 16 replies; 38+ messages in thread
From: Will Deacon @ 2021-07-30 11:24 UTC (permalink / raw)
  To: linux-arm-kernel
  Cc: linux-arch, linux-kernel, Will Deacon, Catalin Marinas,
	Marc Zyngier, Greg Kroah-Hartman, Peter Zijlstra,
	Morten Rasmussen, Qais Yousef, Suren Baghdasaryan,
	Quentin Perret, Tejun Heo, Johannes Weiner, Ingo Molnar,
	Juri Lelli, Vincent Guittot, Rafael J. Wysocki, Dietmar Eggemann,
	Daniel Bristot de Oliveira, Valentin Schneider, Mark Rutland,
	kernel-team

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


^ permalink raw reply	[flat|nested] 38+ messages in thread

end of thread, other threads:[~2021-08-23  9:26 UTC | newest]

Thread overview: 38+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-30 11:24 [PATCH v11 00/16] Add support for 32-bit tasks on asymmetric AArch32 systems Will Deacon
2021-07-30 11:24 ` [PATCH v11 01/16] sched: Introduce task_cpu_possible_mask() to limit fallback rq selection Will Deacon
2021-08-23  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
2021-08-23  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
2021-08-23  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
2021-08-23  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
2021-08-23  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
2021-08-23  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
2021-08-17 15:40   ` Peter Zijlstra
2021-08-18 10:50     ` Will Deacon
2021-08-18 10:56       ` Peter Zijlstra
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
2021-08-17 15:10   ` Peter Zijlstra
2021-08-18 10:42     ` Will Deacon
2021-08-18 10:56       ` Peter Zijlstra
2021-08-18 11:53         ` Peter Zijlstra
2021-08-18 12:19           ` Will Deacon
2021-08-18 11:06       ` Peter Zijlstra
2021-08-17 15:41   ` Peter Zijlstra
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
2021-08-23  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 ` [PATCH v11 11/16] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 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 ` [PATCH v11 13/16] arm64: Advertise CPUs capable of running 32-bit applications in sysfs 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 ` [PATCH v11 15/16] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Will Deacon
2021-07-30 11:24 ` [PATCH v11 16/16] Documentation: arm64: describe asymmetric 32-bit support Will Deacon

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