Memory Accesses in Old Generation

Tony Printezis Antonios.Printezis at sun.com
Mon Mar 2 14:16:31 PST 2009


Well, you can protect the entire old gen and update your stats when you 
trap. It will be very slow though. I'm curious what you'd like to do 
with the stats.

Tony

Peng Du wrote:
> Hello, everyone
>
> If I want to trace the frequencies of memory accesses (read/write) in
> the old generation in Hotspot with page granularity(say 4K), what do you
> think is the best way to do it? 
>
> For example: 
>
> GC: 		ParallelOldGC
> OldGen: 	0x849e0000 -> 0x873c0000
>
> Output:
> ======= Page =======    == Freq ==
> 0x849e0000-0x849e1000	   34
> 0x849e1000 0x849e2000	   53
> 0x849e2000 0x849e3000	   23
> 0x849e3000 0x849e4000	   56
> 0x849e4000 0x849e5000	   788
>        ......              ......
>
>
> Thanks in advance! 
>
>
> Peng Du
> 03/02/2009
>
>   

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