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>, Li Zefan <lizefan@huawei.com>, Johannes Weiner <hannes@cmpxchg.org>, Ingo Molnar <mingo@redhat.com>, Juri Lelli <juri.lelli@redhat.com>, Vincent Guittot <vincent.guittot@linaro.org>, kernel-team@android.com Subject: [PATCH v3 09/14] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Date: Fri, 13 Nov 2020 09:37:14 +0000 [thread overview] Message-ID: <20201113093720.21106-10-will@kernel.org> (raw) In-Reply-To: <20201113093720.21106-1-will@kernel.org> If the scheduler cannot find an allowed CPU for a task, cpuset_cpus_allowed_fallback() will widen the affinity to cpu_possible_mask if cgroup v1 is in use. In preparation for allowing architectures to provide their own fallback mask, just return early if we're not using cgroup v2 and allow select_fallback_rq() to figure out the mask by itself. Cc: Li Zefan <lizefan@huawei.com> Cc: Tejun Heo <tj@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Will Deacon <will@kernel.org> --- kernel/cgroup/cpuset.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 57b5b5d0a5fd..e970737c3ed2 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -3299,9 +3299,11 @@ void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask) void cpuset_cpus_allowed_fallback(struct task_struct *tsk) { + if (!is_in_v2_mode()) + return; /* select_fallback_rq will try harder */ + rcu_read_lock(); - do_set_cpus_allowed(tsk, is_in_v2_mode() ? - task_cs(tsk)->cpus_allowed : cpu_possible_mask); + do_set_cpus_allowed(tsk, task_cs(tsk)->cpus_allowed); rcu_read_unlock(); /* -- 2.29.2.299.gdc1121823c-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, Marc Zyngier <maz@kernel.org>, kernel-team@android.com, Vincent Guittot <vincent.guittot@linaro.org>, Juri Lelli <juri.lelli@redhat.com>, Quentin Perret <qperret@google.com>, Peter Zijlstra <peterz@infradead.org>, Catalin Marinas <catalin.marinas@arm.com>, Johannes Weiner <hannes@cmpxchg.org>, linux-kernel@vger.kernel.org, Qais Yousef <qais.yousef@arm.com>, Suren Baghdasaryan <surenb@google.com>, Ingo Molnar <mingo@redhat.com>, Li Zefan <lizefan@huawei.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Tejun Heo <tj@kernel.org>, Will Deacon <will@kernel.org>, Morten Rasmussen <morten.rasmussen@arm.com> Subject: [PATCH v3 09/14] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Date: Fri, 13 Nov 2020 09:37:14 +0000 [thread overview] Message-ID: <20201113093720.21106-10-will@kernel.org> (raw) In-Reply-To: <20201113093720.21106-1-will@kernel.org> If the scheduler cannot find an allowed CPU for a task, cpuset_cpus_allowed_fallback() will widen the affinity to cpu_possible_mask if cgroup v1 is in use. In preparation for allowing architectures to provide their own fallback mask, just return early if we're not using cgroup v2 and allow select_fallback_rq() to figure out the mask by itself. Cc: Li Zefan <lizefan@huawei.com> Cc: Tejun Heo <tj@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Will Deacon <will@kernel.org> --- kernel/cgroup/cpuset.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 57b5b5d0a5fd..e970737c3ed2 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -3299,9 +3299,11 @@ void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask) void cpuset_cpus_allowed_fallback(struct task_struct *tsk) { + if (!is_in_v2_mode()) + return; /* select_fallback_rq will try harder */ + rcu_read_lock(); - do_set_cpus_allowed(tsk, is_in_v2_mode() ? - task_cs(tsk)->cpus_allowed : cpu_possible_mask); + do_set_cpus_allowed(tsk, task_cs(tsk)->cpus_allowed); rcu_read_unlock(); /* -- 2.29.2.299.gdc1121823c-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-11-13 9:38 UTC|newest] Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-13 9:37 [PATCH v3 00/14] An alternative series for asymmetric AArch32 systems Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 01/14] arm64: cpuinfo: Split AArch32 registers out into a separate struct Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 02/14] arm64: Allow mismatched 32-bit EL0 support Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-19 11:27 ` Valentin Schneider 2020-11-19 11:27 ` Valentin Schneider 2020-11-19 13:12 ` Will Deacon 2020-11-19 13:12 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 03/14] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched " Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 04/14] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 05/14] arm64: Advertise CPUs capable of running 32-bit applications in sysfs Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 06/14] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 07/14] sched: Introduce restrict_cpus_allowed_ptr() to limit task CPU affinity Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-19 9:18 ` Quentin Perret 2020-11-19 9:18 ` Quentin Perret 2020-11-19 11:03 ` Quentin Perret 2020-11-19 11:03 ` Quentin Perret 2020-11-19 11:05 ` Will Deacon 2020-11-19 11:05 ` Will Deacon 2020-11-19 11:27 ` Valentin Schneider 2020-11-19 11:27 ` Valentin Schneider 2020-11-19 13:13 ` Will Deacon 2020-11-19 13:13 ` Will Deacon 2020-11-19 14:54 ` Valentin Schneider 2020-11-19 14:54 ` Valentin Schneider 2020-11-19 16:41 ` Will Deacon 2020-11-19 16:41 ` Will Deacon 2020-11-19 12:47 ` Valentin Schneider 2020-11-19 12:47 ` Valentin Schneider 2020-11-19 13:13 ` Will Deacon 2020-11-19 13:13 ` Will Deacon 2020-11-19 14:54 ` Valentin Schneider 2020-11-19 14:54 ` Valentin Schneider 2020-11-19 16:09 ` Peter Zijlstra 2020-11-19 16:09 ` Peter Zijlstra 2020-11-19 16:57 ` Valentin Schneider 2020-11-19 16:57 ` Valentin Schneider 2020-11-19 19:25 ` Will Deacon 2020-11-19 19:25 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 08/14] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-19 9:24 ` Quentin Perret 2020-11-19 9:24 ` Quentin Perret 2020-11-19 11:06 ` Will Deacon 2020-11-19 11:06 ` Will Deacon 2020-11-19 16:19 ` Peter Zijlstra 2020-11-19 16:19 ` Peter Zijlstra 2020-11-19 16:30 ` Will Deacon 2020-11-19 16:30 ` Will Deacon 2020-11-19 16:44 ` Peter Zijlstra 2020-11-19 16:44 ` Peter Zijlstra 2020-11-19 16:51 ` Will Deacon 2020-11-19 16:51 ` Will Deacon 2020-11-19 16:14 ` Peter Zijlstra 2020-11-19 16:14 ` Peter Zijlstra 2020-11-19 16:28 ` Will Deacon 2020-11-19 16:28 ` Will Deacon 2020-11-19 16:42 ` Peter Zijlstra 2020-11-19 16:42 ` Peter Zijlstra 2020-11-19 16:48 ` Will Deacon 2020-11-19 16:48 ` Will Deacon 2020-11-13 9:37 ` Will Deacon [this message] 2020-11-13 9:37 ` [PATCH v3 09/14] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 Will Deacon 2020-11-19 9:29 ` Quentin Perret 2020-11-19 9:29 ` Quentin Perret 2020-11-19 11:06 ` Will Deacon 2020-11-19 11:06 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 10/14] sched: Introduce arch_cpu_allowed_mask() to limit fallback rq selection Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-19 9:38 ` Quentin Perret 2020-11-19 9:38 ` Quentin Perret 2020-11-19 11:07 ` Will Deacon 2020-11-19 11:07 ` Will Deacon 2020-11-19 20:39 ` Will Deacon 2020-11-19 20:39 ` Will Deacon 2020-11-23 14:48 ` Quentin Perret 2020-11-23 14:48 ` Quentin Perret 2020-11-13 9:37 ` [PATCH v3 11/14] sched: Reject CPU affinity changes based on arch_cpu_allowed_mask() Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-19 9:47 ` Quentin Perret 2020-11-19 9:47 ` Quentin Perret 2020-11-19 11:07 ` Will Deacon 2020-11-19 11:07 ` Will Deacon 2020-11-19 14:30 ` Quentin Perret 2020-11-19 14:30 ` Quentin Perret 2020-11-19 16:44 ` Will Deacon 2020-11-19 16:44 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 12/14] arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 13/14] arm64: Implement arch_cpu_allowed_mask() Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-13 9:37 ` [PATCH v3 14/14] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Will Deacon 2020-11-13 9:37 ` Will Deacon 2020-11-19 16:11 ` [PATCH v3 00/14] An alternative series for asymmetric AArch32 systems Peter Zijlstra 2020-11-19 16:11 ` Peter Zijlstra 2020-11-19 16:39 ` Will Deacon 2020-11-19 16:39 ` Will Deacon
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