Messages in this thread | | | Date | Mon, 03 Sep 2001 12:22:26 -0300 (BRT) | From | Marcelo Tosatti <> | Subject | Re: Rik`s ac12-pmap2 vs ac12-vanilla perfcomp |
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On Sun, 2 Sep 2001, Daniel Phillips wrote:
> On September 2, 2001 11:46 pm, Samium Gromoff wrote: > > Daniel Phillips wrote: > > > > One thing that goes away with rmaps is the need to scan process page tables. > > > It's possible that this takes enough load off L1 cache to produce the effects > > > > I feel like that. > > actually there was a fear that the overhead of reverse map maintenance > > will overthrow the gain on low loads, but in my case this isnt an issue. > > Rik's patch can be optimized a lot by using a direct pointer to the pte in the > nonshared case, and perhaps a null rmap pointer in the kernel-only case (e.g., > page cache). If the non-optimized version is already performing better than the > traditional approach it's a very good sign. This needs careful confirmation. > > Measurements where you force your system into continuous swapping would be very > interesting.
Indeed.
Samium, I would appreciated if you could run heavy anon mem tests with Rik's code. (eg programs from the memtest suite, make -jALOT, etc)
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