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SubjectRe: [PATCH]: 1/4 batch mark_page_accessed()
Marcelo Tosatti writes:

[...]

>
> Average Half Load -j 4 Run: Average Half Load -j 4 Run:
> Elapsed Time 274.916 Elapsed Time 245.026
> User Time 833.63 User Time 832.34
> System Time 73.704 System Time 73.41
> Percent CPU 335.8 Percent CPU 373.6
> Context Switches 12984.8 Context Switches 13427.4
> Sleeps 21459.2 Sleeps 21642

What is "System Time" here? Does in include CPU consumption by, say,
kswapd? If not, then one may conjecture that mark_page_accessed batching
modifies ordering of pages on zone "LRU" lists in a way that measurably
changes efficiency of VM scanning, and mostly affects process that scans
most---kswapd.

Nikita.

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