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[Qemu-devel] [RFC] Buffers/caches in VirtIO Balloon driver stats

From: Tomáš Golembiovský
Subject: [Qemu-devel] [RFC] Buffers/caches in VirtIO Balloon driver stats
Date: Sun, 27 Aug 2017 23:30:33 +0200


We'd like to include information about reclaimable memory into the
statistics in VirtiO Balloon driver. Namely, we'd like to include
counters for bufferes and caches of Linux kernel. The patch itself is
pretty trivial -- no problem there. But before we do that I'd like to
get some input from the QEMU community.

1) Is there any reason not to have the stats there?

2) Considering the balloon device is multiplatform (Linux, BSD,
Windows), is there a problem with including buffers/caches? These seem
to be specific to the Linux virtual memory subsystem. Of course, other
OSes could just report zeros. Are there some internal stats on those
OSes that could be filled in? I don't now if such or similar statistic
are available on BSD. On Windows only SystemCache stat looks like
something relevant. Anyone familiar with those OSes has any suggestions?


Tomáš Golembiovský <address@hidden>

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