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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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2
kernel/fork.c
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@@ -446,6 +446,7 @@ void put_task_stack(struct task_struct *tsk)
void free_task(struct task_struct *tsk)
{
release_user_cpus_ptr(tsk);
scs_release(tsk);
#ifndef CONFIG_THREAD_INFO_IN_TASK
@@ -919,6 +920,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
#endif
if (orig->cpus_ptr == &orig->cpus_mask)
tsk->cpus_ptr = &tsk->cpus_mask;
dup_user_cpus_ptr(tsk, orig, node);
/*
* One for the user space visible state that goes away when reaped.