[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] write page table in user mode
>From: Tim Deegan [mailto:Tim.Deegan@xxxxxxxxxx] >Sent: 2008年2月4日 19:01 > >Nor do I (since as Kevin points out we don't count this separately) but >with the increasing completeness of the emulator, we've already lost a >lot of heuristics for unshadowing pages -- this is what the >unshadow-after-three-writes heuristic is trying to fix, for >example. It >seems odd to be making the unshadowing more aggressive with >one hand and >less aggressive with the other. > BTW, as a heads up we're trying another heuristic to take DMA page into unshadow candidate, which requires Qemu's help indicating whether data in ioreq is a DMA target. This should help capture one vague area when released page tables are used by kernel drivers. DMA is normally one big factor for frequent page allocation/free. It's also not affected by more complete emulator. Now well, patch is just in progress and we need many experiments to see how it behaves like compared to 3-write-unshadow, etc. But We may be only able to get something after Chinese New Year vacation. :-) Thanks, Kevin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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