Messages in this thread | | | Date | Fri, 27 Sep 2002 13:11:47 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: [patch] 'sticky pages' support in the VM, futex-2.5.38-C5 |
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On Thu, 26 Sep 2002, Linus Torvalds wrote:
> and then the "callback" function just updates the page information in > the futex block directly - as if it was looked up anew.
yes. And it would also have to rehash the futex queue (which is hashed along (page,offset), because a FUTEX_WAKE has to find the proper queue - but it's still very cheap.
this also means that FUTEX_WAIT does not have to make the futex page writable - just making it present and hashing it along the physical page. Ie. more robust and less intrusive futexes.
Ingo
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