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Q0bwFW1hk2SlX940FEALGa9Gc+BdLBI11HcS04PG2IxzYbXqZL2FC7jfg2S9a8GrcXXg7oxke9xN3ecjnZtdsnNqw8diorSv7A7DGKEZ27odQ/5WFKIjO+XWGfDJn/AyTk3we287u0AF2cOlj/+2U/H8GNki+sqF+fRfBgrmxlWGpfmPPYFXpJUv5s8XtmBxGOYu1LfBVVmWwMKRkgehueyEtUUkIMaIZCVxxsM/hd70MNyPdaNXFoKkhdW1eYeR16H65JUpxtuhLZcs/IOJheR+oGpI7fZpUbmVKSpZc6A7P5cekyc1Kkm5Aorg9fAkrEOUfqk6G1cYsVfQ8RoJxJ34z8u4bTUB/7LUhq5uGZdlXF2M3BOijpjfniA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 1/30/2023 9:21 PM, Matthew Wilcox wrote: > On Mon, Jan 30, 2023 at 08:55:00PM +0800, Yin Fengwei wrote: >> Allow the batched page table population added to fault >> around handler and benefit both file read and shared >> fault. >> >> Signed-off-by: Yin Fengwei > > Reviewed-by: Matthew Wilcox (Oracle) > > Perhaps the performance effect of this patch should go into this patch's > description since it's so dramatic? I would change-log this as: > > The shared fault handler can also benefit from fault-around. While it > is uncommon to write to MAP_SHARED files, applications that do will see > a huge benefit with will-it-scale:page_fault3 (shared file write fault) > improving by 375%. Thanks a lot for reviewing. I will update the commit message. Regards Yin, Fengwei