Messages in this thread | | | From | Ian Campbell <> | Date | Sun, 22 Aug 2010 08:33:06 +0100 | Subject | Re: [RFC] mlock/stack guard interaction fixup |
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On Sun, 2010-08-22 at 07:57 +0100, Ian Campbell wrote: > On Sat, 2010-08-21 at 08:48 -0700, Linus Torvalds wrote: > > On Sat, Aug 21, 2010 at 4:56 AM, Ian Campbell <ijc@hellion.org.uk> wrote: > > > > > > I don't know that they are particularly good tests for this change but I > > > also ran allmodconfig kernel build and ltp on 2.6.35.3+fixes without > > > issue. Are there any good mlock heavy workloads? > > > > mlock itself isn't very interesting, I think more interesting is > > testing that the doubly linked list handles all the cases correctly. > > Something that splits mappings, unmaps partial ones etc etc. Running > > something like Electric Fence is probably a good idea. > > EF_DISABLE_BANNER=1 EF_ALLOW_MALLOC_0=1 LD_PRELOAD=libefence.so.0.0 make > > craps out pretty quickly with: > > CC init/main.o > > ElectricFence Exiting: mprotect() failed: Cannot allocate memory > make[1]: *** [init/main.o] Error 255 > make: *** [init] Error 2 > > but it does that with 2.6.35.3, 2.6.35.2, 2.6.35.1 and 2.6.35 too so it > doesn't seem to be breakage relating to any of the stack guard stuff
I increased the vm.max_map_count sysctl and now things are rolling along. Will let you know how I get on.
-- Ian Campbell
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