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title: Log the kernel splitting huge pages into normal sized pages name: hugepage_split.stp version: 1.0 author: William Cohen keywords: memory subsystem: memory status: production exit: user-controlled output: sorted-list scope: system-wide description: Because some portions of the kernel code only work with normal-sized pages the kernel may convert a huge page into a set of normal-sized pages using a split operation. This operation may be relatively expensive and noticeable to latency sensitive programs. You can identify if split operations are occurring with the systemtap hugepage_split.stp script. test_support: stap -l 'kernel.function("split_huge_page")' test_check: stap -p4 hugepage_split.stp test_installcheck: stap hugepage_split.stp -T 1