Messages in this thread | | | Date | Tue, 28 Feb 2006 19:24:17 +1100 | From | David Gibson <> | Subject | Re: [PATCH] Enable mprotect on huge pages |
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On Tue, Feb 28, 2006 at 11:23:54AM +0800, Zhang, Yanmin wrote: > On Tue, 2006-02-28 at 09:34, Andrew Morton wrote: > > "Zhang, Yanmin" <yanmin_zhang@linux.intel.com> wrote: > > > > > > > > > > 2.6.16-rc3 uses hugetlb on-demand paging, but it doesn_t support hugetlb > > > > > > > mprotect. My patch against 2.6.16-rc3 enables this capability. > > > > > > Based on David's comments, I worked out a new patch against 2.6.16-rc4. > > > Thank David. > > > > > > > Please always send an updated changelog when sending an updated patch. > > Otherwise I have to go trolling back through the email thread to find it, > > then work out what needs to be changed. > Thanks for your kind reminder. I would do so next time. > > > > > > > > > I tested it on i386/x86_64/ia64. Who could help test it on other > > > platforms, such like PPC64? > > > > I can do that - please send me your test app? > I attach a test case. It will create directory /mnt/hugepages and delete it > after testing automatically. > > To run it by user root: > #gcc -o mprotect_testcase mprotect_testcase.c > #echo "5">/proc/sys/vm/nr_hugepages > #./mprotect_testcase > > You could use gdb to step it to see the changing of the process vma maps.
I've just added a simpler testcase than this one to the libhugetlbfs testsuite. Both R->RW and RW->R transitions appear to work (I haven't tested EXEC transitions yet, that's hairier).
-- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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