I see 2 ways to do this. 1. allocate 512 4KB contiguous pages everytime a handle_mm_fault is called and have the THP kernel thread to coalesce it to a huge page. 2. modify the kernel (maybe extensively) to allocate 2MB page by default.
I like 1. better because it requires less modifications. but it is not as reliable. any suggestions Xin On Wed, Jul 30, 2014 at 2:57 PM, <[email protected]> wrote: > On Wed, 30 Jul 2014 14:41:26 -0500, Xin Tong said: > > > Is there anyway for me to turn on HugePage by default in the Linux X86 > > kernel, i.e. allocate a 2MB page by default in place of 4KB now ? > > Possibly related config entries to research: > > CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y > CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION=y > CONFIG_TRANSPARENT_HUGEPAGE=y > CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y > # CONFIG_TRANSPARENT_HUGEPAGE_MADVISE is not set > > However, if you allocate a single 4K page, that *won't* automatically > promote it to a hugepage - you need to allocate 2M of contiguous virtual > address space with the same access flags for it to coalesce into a > hugepage. >
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