On 07/20/2012 05:50 AM, Kirill A. Shutemov wrote:
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Clearing a 2MB huge page will typically blow away several levels of CPU caches. To avoid this only cache clear the 4K area around the fault address and use a cache avoiding clears for the rest of the 2MB area. It would be nice to test the patchset with more workloads. Especially if you see performance regression with THP. Any feedback is appreciated. Andi Kleen (6): THP: Use real address for NUMA policy mm: make clear_huge_page tolerate non aligned address THP: Pass real, not rounded, address to clear_huge_page x86: Add clear_page_nocache mm: make clear_huge_page cache clear only around the fault address x86: switch the 64bit uncached page clear to SSE/AVX v2
This is a mix of x86-specific and generic changes... does anyone mind if I put this into the -tip tree?
-hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>