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scx: Fix CPU online tracking #215
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Commit 10d167d ("SCX: Synchronize boot CPU's online state with SCX_RQ_ONLINE") fixes the oversight that we're not synchronizing the boot CPU's online state with scx_rq's online state. It does this by adding a check in init_sched_ext_class() for whether a CPU is online, and setting the SCX_RQ_ONLINE flag in the rq if it is. The online mask may not be initialized by the time init_sched_ext_class() is invoked, so let's add a late init function where we iterate over the possible CPUs and do this check there. Signed-off-by: David Vernet <[email protected]>
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Can confirm, this patch fixes the sched-ext regression. Tested-by: Peter Jung [email protected] |
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Tested-by: Piotr Gorski [email protected] |
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Hmm, multiple CachyOS users (using x86) are swearing that this PR improves interactivity over @htejun's original fix. I'm confused as to why, as it should have been a no-op. Will have to look more closely next week. |
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I'm going to close this out -- there really shouldn't be any difference between top of tree and this fix. If someone is able to show something statistically significant we can reopen and revisit. |
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Commit 10d167d ("SCX: Synchronize boot CPU's online state with SCX_RQ_ONLINE") fixes the oversight that we're not synchronizing the boot CPU's online state with scx_rq's online state. It does this by adding a check in init_sched_ext_class() for whether a CPU is online, and setting the SCX_RQ_ONLINE flag in the rq if it is.
The online mask may not be initialized by the time init_sched_ext_class() is invoked, so let's add a late init function where we iterate over the possible CPUs and do this check there.