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U2FsdGVkX1+UYYTn+cNFCH8hQ/XFXSYSoIM4CYBTgbAjFdZ7h0MatzDJ1wzM+t3sIM5OCHokzd5GE8i4UPV1WIKivHkAXY3PEpzGt4gJbDZiBX8CFpYYvWWGgML5XVG6+t5vr3W+dIDzQyrsLbYx+bKBKCjVbp7erR5oI/VXZY6lHxVa3Bl7Ck0BWYiq3s+ILY0MEWA6ags+4UIONc1TU4MhI84GxSCm6MS7XZ/3Z/NJaCj4xZM2iXMCkl/xk87L6IXfVZTrVHgV7xPwz3WJ4MljP+DosYV86nIBfoOGLzE0bNAvznJB7EoDA25/uWGeXBe72CN7cWG/swBps6dxH8dsWX2M7/cHVvYrQTK9mrOqqAd5vZeILxeV3PZUffgU65NWIKAHLSxKbxh35KcbfmXp7Updu0UNb9zkfp3KOOZNTGhjMGJZxt5UaNnCfXXG55gYS3KTiwZEVXCDdC7NuF2RJbT/+zxJbIc7EtXnZ2bkVu1X9ujpY6PCbeKG2NEEAxcqWQicIkLo6cm13OJYpMccaEWhr2zpBR6JXTfLzfY5zVdGBKhL/ABf681n30FcNV90w7pmJwFZAE/rMZIfTWoSHsQN894+x1WJevt7y5fTZWeaapv+cVeV1UzibjD8VYotja3nmJIm2ZG0BUkW4mTd5jx1+gKy1wjSgcLQM2hssRbAK2g75xX/v5KS+i54+rw+A/LUh9a6rQXTsRu8JxQvAQJCLXqPr/eQFrA0lYdilNWhkP9WcB0MJlhMeIETgAhyVRv4tr/yCXXI94JiIRj2vtII/x/i4UBYddbgczzp/VhS5Yw33nKF2d046YKfqoP2muVgrCy4UOo62ifFG5ybJkW2TYtS/TQhwdYGLmC94/Cm6lYKQildWKE4KrplOPgvsCPrw3JUDwQln4BQo5ctQp7PecF/Yx8j5rnEn1/DrYsX2XRSmh78aTNadkGi8v0RlaeAq7nJjsz6Fhk WieHyhLN 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to clear contiguous page ranges instead of >>> clearing using the current page-at-a-time approach. Exposing the largest >>> feasible length can be useful in enabling processors to optimize based >>> on extent. >> This patch is something which MM developers might care to take a closer >> look at. >> >>> However, clearing in large chunks can have two problems: >>> >>> - cache locality when clearing small folios (< MAX_ORDER_NR_PAGES) >>> (larger folios don't have any expectation of cache locality). >>> >>> - preemption latency when clearing large folios. >>> >>> Handle the first by splitting the clearing in three parts: the >>> faulting page and its immediate locality, its left and right >>> regions; with the local neighbourhood cleared last. >> Has this optimization been shown to be beneficial? >> If so, are you able to share some measurements? >> If not, maybe it should be removed? >> > > I reverted the effect of this patch by hard coding > > #define PAGE_CONTIG_NR 1 > > I see that benefit for voluntary kernel is lost without this change > > (for rep stosb) > > with PAGE_CONTIG_NR equivalent to 8MB > > Preempt mode: voluntary > > # Running 'mem/mmap' benchmark: > # function 'demand' (Demand loaded mmap()) > # Copying 64GB bytes ... > > 34.533414 GB/sec > > > with PAGE_CONTIG_NR equivalent to 4KB > > # Running 'mem/mmap' benchmark: > # function 'demand' (Demand loaded mmap()) > # Copying 64GB bytes ... > > 20.766059 GB/sec > > For now (barring David's recommendations), > feel free to add > > Reviewed-by: Raghavendra K T Thanks Raghu. -- ankur