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author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2022-03-17 17:51:32 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-13 21:59:27 +0300 |
commit | ff6505766565616deb65a203e62d4ca63c6c277b (patch) | |
tree | 764a8caa3f25ac965878c0760c6e0f92ac26d987 /arch | |
parent | f399f38eda5779fe90f0620024197f74a45012c0 (diff) | |
download | linux-ff6505766565616deb65a203e62d4ca63c6c277b.tar.xz |
sched: Teach the forced-newidle balancer about CPU affinity limitation.
commit 386ef214c3c6ab111d05e1790e79475363abaa05 upstream.
try_steal_cookie() looks at task_struct::cpus_mask to decide if the
task could be moved to `this' CPU. It ignores that the task might be in
a migration disabled section while not on the CPU. In this case the task
must not be moved otherwise per-CPU assumption are broken.
Use is_cpu_allowed(), as suggested by Peter Zijlstra, to decide if the a
task can be moved.
Fixes: d2dfa17bc7de6 ("sched: Trivial forced-newidle balancer")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/YjNK9El+3fzGmswf@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions