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authorMatthew Wilcox (Oracle) <willy@infradead.org>2024-03-15 15:08:21 +0100
committerAndrew Morton <akpm@linux-foundation.org>2024-03-26 19:07:20 +0100
commit9cecde80aae0fb0aa44425575d5aca71bc646d89 (patch)
treea83f883a6029075b4b69be99e80decc8db3ba56b /mm/mempolicy.c
parentmm,page_owner: fix recursion (diff)
downloadlinux-9cecde80aae0fb0aa44425575d5aca71bc646d89.tar.xz
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mm: increase folio batch size
On a 104 thread, 2 socket Skylake system, Intel report a 4.7% performance reduction with will-it-scale page_fault2. This was due to reducing the size of the batch from 32 to 15. Increasing the folio batch size from 15 to 31 gives a performance increase of 12.5% relative to the original, or 17.2% relative to the reduced performance commit. The penalty of this commit is an additional 128 bytes of stack usage. Six folio_batches are also allocated from percpu memory in cpu_fbatches so that will be an additional 768 bytes of percpu memory (per CPU). Tim Chen originally submitted a patch like this in 2020: https://lore.kernel.org/linux-mm/d1cc9f12a8ad6c2a52cb600d93b06b064f2bbc57.1593205965.git.tim.c.chen@linux.intel.com/ Link: https://lkml.kernel.org/r/20240315140823.2478146-1-willy@infradead.org Fixes: 99fbb6bfc16f ("mm: make folios_put() the basis of release_pages()") Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Tested-by: Yujie Liu <yujie.liu@intel.com> Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202403151058.7048f6a8-oliver.sang@intel.com Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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