The mTHP swap related counters: 'anon_swpout' and 'anon_swpout_fallback' are
confusing with an 'anon_' prefix, since the shmem can swap out non-anonymous
pages. So drop the 'anon_' prefix to keep consistent with the old swap counter
names.
Suggested-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
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