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glibc-malloc.meta
381
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glibc-malloc.stp
2.43
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hugepage_clear_delays.meta
946
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hugepage_clear_delays.stp
483
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hugepage_collapse.meta
718
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hugepage_collapse.stp
159
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hugepage_cow_delays.meta
1.08
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hugepage_cow_delays.stp
475
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hugepage_split.meta
756
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hugepage_split.stp
153
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hw_watch_addr.meta
787
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hw_watch_addr.stp
167
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hw_watch_addr.tcl
97
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hw_watch_sym.meta
715
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hw_watch_sym.stp
167
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hw_watch_sym.tcl
97
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kmalloc-top
3.8
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kmalloc-top.meta
695
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last_100_frees.meta
420
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last_100_frees.stp
803
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last_100_frees.tcl
79
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last_100_frees.txt
774
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mmanonpage.meta
1.2
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mmanonpage.stp
1.77
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mmfilepage.meta
929
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mmfilepage.stp
3.47
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mmreclaim.meta
606
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mmreclaim.stp
5.11
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mmwriteback.meta
1008
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mmwriteback.stp
1.92
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numa_faults.meta
702
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numa_faults.stp
973
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numa_faults.txt
1.67
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overcommit.meta
484
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overcommit.stp
217
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pfaults.meta
744
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pfaults.stp
875
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pfaults.txt
558
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vm.tracepoints.meta
608
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vm.tracepoints.stp
414
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vm.tracepoints.txt
557
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Code Editor : hugepage_cow_delays.meta
title: Summarize the time each process spends doing copy on write for huge pages name: hugepage_cow_delays.stp version: 1.0 author: William Cohen keywords: memory subsystem: memory status: production exit: user-controlled output: sorted-list scope: system-wide description: The system may attempt to reduce memory use by having two or more difference processes share the same writeable page in memory. However, when one of the processes write to shared page that is marked copy on write (COW) the page must be duplicated and then modified. On x86_64 machines the huge pages are 2MB in size, 512 times larger than a normal 4KB page. Thus, copy on write operation on a huge page can delay program execution by a hundred or more microseconds and maybe noticeable to latency sensitive programs. This script will tally the number of times that each process triggers a huge page copy on write, the total time in microseconds spent copying the pages, and the average time in microseconds of the huge page copy. test_check: stap -p4 hugepage_cow_delays.stp test_installcheck: stap hugepage_cow_delays.stp -T 1
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