Messages in this thread | | | Date | Tue, 11 Aug 2020 13:39:24 -0400 | From | Qian Cai <> | Subject | Re: [PATCH v6 00/12] HWPOISON: soft offline rework |
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On Tue, Aug 11, 2020 at 03:11:40AM +0000, HORIGUCHI NAOYA(堀口 直也) wrote: > I'm still not sure why the test succeeded by reverting these because > current mainline kernel provides similar mechanism to prevent reuse of > soft offlined page. So this success seems to me something suspicious. > > To investigate more, I want to have additional info about the page states > of the relevant pages after soft offlining. Could you collect it by the > following steps? > > - modify random.c not to run hotplug_memory() in migrate_huge_hotplug_memory(), > - compile it and run "./random 1" once, > - to collect page state with hwpoisoned pages, run "./page-types -Nlr -b hwpoison", > where page-types is available under tools/vm in kernel source tree. > - choose a few pfns of soft offlined pages from kernel message > "Soft offlining pfn ...", and run "./page-types -Nlr -a <pfn>".
# ./page-types -Nlr -b hwpoison offset len flags 99a000 1 __________B________X_______________________ 99c000 1 __________B________X_______________________ 99e000 1 __________B________X_______________________ 9a0000 1 __________B________X_______________________ ba6000 1 __________B________X_______________________ baa000 1 __________B________X_______________________
Every single one of pfns was like this,
# ./page-types -Nlr -a 0x99a000 offset len flags 99a000 1 __________B________X_______________________
# ./page-types -Nlr -a 0x99e000 offset len flags 99e000 1 __________B________X_______________________
# ./page-types -Nlr -a 0x99c000 offset len flags 99c000 1 __________B________X_______________________
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