How are swap_cache_info.noent_race, swap_cache_info.exist_race incremented?

["Nate, Greg" <Greg_Nate@xxxxxxx>]

I am trying to understand exactly what these counters are and mean.  The
only place in the code I find them is in the .c file where they are
defined as part of the swap_cache_info struct.

I became interested in them after looking at sysrq output from a hung
system.  There was a line that reported "race 0+118".  Usually it says
"race 0+0".  Any ideas on what this means either?

Thanks, 

greg

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