How does sleep really work in the Android kernel? (ma.fellr.net)

submitted 2 years ago by [email protected] to c/[email protected]

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How does sleep really work in the Android kernel?

I've been wondering about this for a while, but couldn't find anything about it. What exactly happens after the screen turns off? Does the kernel actually suspend and halt the CPU? If so, how are notifications received while sleeping? Is there a coprocessor involved?

I'm curious. It would be great if someone could point me towards some articles or videos about this.

@[email protected] @[email protected] @[email protected] @[email protected] #android #linux #kernel #sleep #suspend

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[-] [email protected] 2 points 2 years ago

Earlier I've read that it only keeps a single CPU core as active, at least for most of the time sleeping. But take this with a grain of salt, it was long ago so I may misremembered it, and also it might have changed a lot since then, but afaik this was a technique they once used (and may still do)

this post was submitted on 06 Sep 2023

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