Messages in this thread | | | Date | Thu, 26 Sep 2002 07:41:40 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [patch 1/4] prepare_to_wait/finish_wait sleep/wakeup API |
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On Wed, 25 Sep 2002, Andrew Morton wrote: > > I expect a decent win would come from using this technique in > select/poll, but that code relies on the remains-on-the-waitqueue > semantics, and would need some fiddling.
Actually, I think that select/poll is exactly the kind of thing that would _not_ improve noticeably, since usually it's only one (out of possibly hundreds) or wait-queues that gets woken up.
So even if that one were to be made faster, the _real_ cost when it comes to the wait-queues will be all the other 99 waitqueues that select/poll has to remove itself from the old way anyway.
Linus
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