Messages in this thread | | | Date | Wed, 20 May 2009 22:32:58 +0800 | From | Wu Fengguang <> | Subject | Re: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen |
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On Wed, May 20, 2009 at 07:20:24PM +0800, Andi Kleen wrote: > Wu Fengguang <fengguang.wu@intel.com> writes: > > > > 2.6.30-rc4-mm, VM_EXEC protection ON > > ------------------------------------ > > begin: 2444 6652 50021 207 0 619959 > > end: 284 231752 233394 210 773879 20890132 > > restore: 399 231973 234352 251 776879 20960568 > > > > We can reach basically the same conclusion from the above data. > > One scenario that might be useful to test is what happens when some > very large processes, all mapped and executable exceed memory and
Good idea. Too bad I may have to install some bloated desktop in order to test this out ;) I guess the pgmajfault+pswpin numbers can serve as negative scores in that case?
> fight each other for the working set. Do you have regressions then > compared to without the patches?
No regressions for the above test. IMHO it can hardly create regressions if there are no one to aggressively abuse it. Rik and Christoph's ratio based logics are more likely to achieve better protections as well as regressions.
Thanks, Fengguang
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