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3af0191a59
On Android app cycle workloads, MGLRU showed a significant reduction in
workingset refaults although pgpgin/pswpin remained relatively unchanged.
This indicated MGLRU may be undercounting workingset refaults.
This has impact on userspace programs, like Android's LMKD, that monitor
workingset refault statistics to detect thrashing.
It was found that refaults were only accounted if the MGLRU shadow entry
was for a recently evicted folio. However, recently evicted folios should
be accounted as workingset activation, and refaults should be accounted
regardless of recency.
Fix MGLRU's workingset refault and activation accounting to more closely
match that of the conventional active/inactive LRU.
Link: https://lkml.kernel.org/r/20230523205922.3852731-1-kaleshsingh@google.com
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.