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tools/vm/page-types.c: add support for idle page tracking

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Add a flag which causes page-types to use the kernels's idle page
tracking to mark pages idle.  As the tool already prints the idle flag
if set, subsequent runs will show which pages have been accessed since
last run.

[akpm@linux-foundation.org: simplify mark_page_idle()]
[chansen3@cisco.com: reorganize mark_page_idle() logic, add docs]
  Link: http://lkml.kernel.org/r/20180706172237.21691-1-chansen3@cisco.com
Link: http://lkml.kernel.org/r/20180612153223.13174-1-chansen3@cisco.com
Signed-off-by: Christian Hansen <chansen3@cisco.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christian Hansen
2018-08-17 15:45:02 -07:00
committed by Linus Torvalds
parent 7f1d23e607
commit 59ae96ffc3
2 changed files with 51 additions and 1 deletions
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5
Documentation/admin-guide/mm/idle_page_tracking.rst
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@@ -65,6 +65,11 @@ workload one should:
are not reclaimable, he or she can filter them out using
``/proc/kpageflags``.
The page-types tool in the tools/vm directory can be used to assist in this.
If the tool is run initially with the appropriate option, it will mark all the
queried pages as idle. Subsequent runs of the tool can then show which pages have
their idle flag cleared in the interim.
See :ref:`Documentation/admin-guide/mm/pagemap.rst <pagemap>` for more
information about ``/proc/pid/pagemap``, ``/proc/kpageflags``, and
``/proc/kpagecgroup``.