Moving Google toward the mainline

Re:Moving Google toward the mainline by MichaelMoser123 on Wednesday October 06, 2021 @02:29AM (#28769871)

for OOM you do have a lot of flexibility with containers/control groups, nowadays. What kind of problems were they solving with the scheduler? I anything known about that?

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Re:Moving Google toward the mainline by dodobirdlord on Wednesday October 06, 2021 @04:23AM (#28770537)

For background context, a reminder that control groups were originally developed in Google’s kernel fork, and later mainlined.

As for the scheduler stuff, the main change is a SwitchTo set of syscalls that allow threads to bypass the kernel’s scheduler and just continue execution as a different thread. https://lkml.org/lkml/2020/7/22/1202

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Re:Moving Google toward the mainline by MichaelMoser123 on Thursday October 07, 2021 @03:04AM (#28783127)

Thanks for the link, it is explained in the linked video:

https://www.youtube.com/watch?v=KXuZi9aeGTw They explain it around 15:01 - google added it's own syscall switchto_thread - that puts the current thread to sleep and is switching to the argument thread id. (and some other calls too). That one helps with cutting down latency in inter thread calls for m:n threading. The real effort is to make latency for individual application requests predictable, while keeping it low.

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Re:Moving Google toward the mainline by MichaelMoser123 on Thursday October 07, 2021 @06:12PM (#28792767)

the linked video briefly mentions that google has it's own futexs. What would be the difference between regular futexes and the google implementation?

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Re:Moving Google toward the mainline by geofft on Wednesday October 06, 2021 @12:26PM (#28775000)

The article makes a passing reference to "Google Fibers" and "a new API for cooperative scheduling in user space."

There seems to be a Phoronix article with some more info and a link to a preparatory patchset that's public: https://www.phoronix.com/scan.php?page=news_item&px=Google-F...

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