Messages in this thread | | | Date | Thu, 26 Sep 2002 17:27:59 +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:
> This patch seems trivially broken by having two futexes on the same > page. When the first futex removes itself, it will clear the sticky > bit, even though the other futex is still pinning the same page.
sigh. And we cannot even properly detect which unpin_page() was the last unpinning of the page - there can be so many other reasons a page's count is elevated. And keeping a page sticky forever is no solution either, the number of sticky pages would increase significantly, causing real fork() problems.
> Trust me, you'll have to use the page list approach.
yeah, will try that now. I'm a bit worried about the mandatory cross-CPU TLB flushes though.
Ingo
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