On 10 September 2013 05:46, Subash Patel <subas...@gmail.com> wrote: > Hi Xu, Qiang, > > I doubt if it has anything todo with linaro kernel. ARM linux code is > programming the page sizes as 4K.
Steve Capper sent out some cool patches for Transparent Huge Pagetables http://lists.linaro.org/pipermail/linaro-kernel/2013-August/006574.html They applied fine to linux-linaro-core-tracking and seem to work. If you want to change the whole kernel to hugepages, you have to recook or meddle your rootfs with a library preload. But those patches just hide huge pages in linear allocations of smaller pages, so nobody notices. -Andy > From my experience playing with the page tables, you will have to fiddle > with the section size and > page size programming in the ARM mmu initialization. Depending on kernel > split, you store the page > table pointers in TTBR0 and TTBR1, which point to 1MB sections each. The > entries here are marked > to point to 4k pages, You will have to change them to point to 64K. I don't > know someone who has tried > huge pages(64K) in public domain for v7 yet. > > Note: Theoretically it should be possible for the kernel to work with 4K > pages, and user space to allocate > 64K pages. It is a messy change (as it involves changes to process > management as well) Even I am interested > to explore more on this. But tied up with something else at the moment :( > > Regards, > Subash > > > On Wed, Aug 28, 2013 at 12:05 AM, Xu, Qiang <qian...@qti.qualcomm.com> > wrote: >> >> Hi Linaro >> >> >> >> I am a software engineer from Qualcomm. I want to know that if Linaro can >> change its memory page size in kernel ? >> >> >> >> As my CPU is arm-v7, it supports 4k/64k/1M/16M page size translation, but >> in my linux kernel whose version is 2.6.38, the page size is always 4K, >> >> >> >> Do the linux-linaro support different page size in kernel? >> >> >> >> >> >> >> _______________________________________________ >> linaro-dev mailing list >> linaro-dev@lists.linaro.org >> http://lists.linaro.org/mailman/listinfo/linaro-dev >> > > > _______________________________________________ > linaro-dev mailing list > linaro-dev@lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-dev > _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
