Re: [PATCH]: 1/4 batch mark_page_accessed()

[Nikita Danilov]

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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