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authorThomas Gleixner <tglx@linutronix.de>2021-09-28 14:24:27 +0200
committerPeter Zijlstra <peterz@infradead.org>2021-10-05 15:52:12 +0200
commit539fbb5be0da56ffa1434b4f56521a0522bd1d61 (patch)
tree7721f47f5779786d4543a9419dcaf3bb110be274 /kernel/exit.c
parentsched: Limit the number of task migrations per batch on RT (diff)
downloadlinux-539fbb5be0da56ffa1434b4f56521a0522bd1d61.tar.xz
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sched: Disable TTWU_QUEUE on RT
The queued remote wakeup mechanism has turned out to be suboptimal for RT enabled kernels. The maximum latencies go up by a factor of > 5x in certain scenarious. This is caused by either long wake lists or by a large number of TTWU IPIs which are processed back to back. Disable it for RT. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210928122411.482262764@linutronix.de
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