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cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus()

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Asymmetric systems may not offer the same level of userspace ISA support
across all CPUs, meaning that some applications cannot be executed by
some CPUs. As a concrete example, upcoming arm64 big.LITTLE designs do
not feature support for 32-bit applications on both clusters.

Modify guarantee_online_cpus() to take task_cpu_possible_mask() into
account when trying to find a suitable set of online CPUs for a given
task. This will avoid passing an invalid mask to set_cpus_allowed_ptr()
during ->attach() and will subsequently allow the cpuset hierarchy to be
taken into account when forcefully overriding the affinity mask for a
task which requires migration to a compatible CPU.

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <Valentin.Schneider@arm.com>
Link: https://lkml.kernel.org/r/20210730112443.23245-4-will@kernel.org
This commit is contained in:
Will Deacon
2021-07-30 12:24:30 +01:00
committed by Peter Zijlstra
parent d4b96fb92a
commit 431c69fac0
2 changed files with 27 additions and 18 deletions
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2
include/linux/cpuset.h
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@@ -185,7 +185,7 @@ static inline void cpuset_read_unlock(void) { }
static inline void cpuset_cpus_allowed(struct task_struct *p,
struct cpumask *mask)
{
cpumask_copy(mask, cpu_possible_mask);
cpumask_copy(mask, task_cpu_possible_mask(p));
}
static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)