Request for reviews (S): 7148109: C2 compiler consumes too much heap resources

[Christian Thalinger]

Looks good.  -- Chris

On Aug 24, 2012, at 2:30 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:

> http://cr.openjdk.java.net/~kvn/7148109/webrev
> 
> 7148109: C2 compiler consumes too much heap resources
> 
> RA may use a lot of native memory when C2 compiles big method with a lot of branches and simultaneous live date. For each (spill, split) cycle RA allocates arrays in Split() method with size "sizeof(p*)*num_blocks*spill_cnt" and does not free resource on method exit. With  _num_blocks == 1000 and spill_cnt == 500
> RA will use more then 5Mb of additional native memory for each cycle. RA will do up to 24 cycles before bailout so it can consume more then 100Mb by one C2 compiler thread.
> 
> Add split_arena to allocate these arrays and free them on method's exit.
> 
> Thanks,
> Vladimir