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

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Thomas Gleixner 2025-11-19 18:26:45 +01:00 • committed by Peter Zijlstra

parent 80adaccf0e

commit 77d7dc8bef

4 changed files with 64 additions and 800 deletions

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53

include/linux/mm_types.h

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5

kernel/fork.c

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517

kernel/sched/core.c

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293

kernel/sched/sched.h

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