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sched: Introduce task_struct::user_cpus_ptr to track requested affinity

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In preparation for saving and restoring the user-requested CPU affinity
mask of a task, add a new cpumask_t pointer to 'struct task_struct'.

If the pointer is non-NULL, then the mask is copied across fork() and
freed on task exit.

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://lore.kernel.org/r/20210730112443.23245-7-will@kernel.org
This commit is contained in:
Will Deacon 2021-07-30 12:24:33 +01:00 • committed by Peter Zijlstra
parent 234a503e67
commit b90ca8badb
4 changed files with 36 additions and 0 deletions
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1
init/init_task.c
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@ -80,6 +80,7 @@ struct task_struct init_task
.normal_prio = MAX_PRIO - 20,
.policy = SCHED_NORMAL,
.cpus_ptr = &init_task.cpus_mask,
.user_cpus_ptr = NULL,
.cpus_mask = CPU_MASK_ALL,
.nr_cpus_allowed= NR_CPUS,
.mm = NULL,