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sched/mmcid: Revert the complex CID management

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The CID management is a complex beast, which affects both scheduling and
task migration. The compaction mechanism forces random tasks of a process
into task work on exit to user space causing latency spikes.

Revert back to the initial simple bitmap allocating mechanics, which are
known to have scalability issues as that allows to gradually build up a
replacement functionality in a reviewable way.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/20251119172549.068197830@linutronix.de
This commit is contained in:
Thomas Gleixner
2025-11-19 18:26:45 +01:00
committed by Peter Zijlstra
parent 80adaccf0e
commit 77d7dc8bef
4 changed files with 66 additions and 802 deletions
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kernel/fork.c
+2 -3
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@@ -955,10 +955,9 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
#endif
#ifdef CONFIG_SCHED_MM_CID
tsk->mm_cid = -1;
tsk->last_mm_cid = -1;
tsk->mm_cid = MM_CID_UNSET;
tsk->last_mm_cid = MM_CID_UNSET;
tsk->mm_cid_active = 0;
tsk->migrate_from_cpu = -1;
#endif
return tsk;