Messages in this thread | | | Date | Fri, 16 Feb 2018 15:57:52 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] proc/kpageflags: add KPF_WAITERS |
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On Sun, 11 Feb 2018 13:36:41 +0300 Konstantin Khlebnikov <khlebnikov@yandex-team.ru> wrote:
> KPF_WAITERS indicates tasks are waiting for a page lock or writeback. > This might be false-positive, in this case next unlock will clear it.
Well, kpageflags is full of potential false-positives. Or do you think this flag is especially vulnerable?
In other words, under what circumstances will we have KPF_WAITERS set when PG_locked and PG-writeback are clear?
> This looks like worth information not only for kernel hacking.
Why? What are the use-cases, in detail? How are we to justify this modification?
> In tool page-types in non-raw mode treat KPF_WAITERS without > KPF_LOCKED and KPF_WRITEBACK as false-positive and hide it.
> fs/proc/page.c | 1 + > include/uapi/linux/kernel-page-flags.h | 1 + > tools/vm/page-types.c | 7 +++++++
Please update Documentation/vm/pagemap.txt.
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