RFR (M): 8035406: Improve data structure for Code Cache remembered sets

[Thomas Schatzl]

Hi,

On Tue, 2014-02-25 at 11:20 +0100, Mikael Gerdin wrote:
> Hi,
> > 
> > > Since the mutex is no longer only covering the OtherRegionsTable, should
> > > it be renamed to "HeapRegionRemSet lock"?
> > > Also, it appears that the Mutex constructor actually copies the name
> > > string
> > > into the Mutex object, so we can format the string with whatever contents
> > > we want, such as "HeapRegionRemSet lock for region #4711" without
> > > increasing footprint.
> > 
> > Fixed. That required some minor changes to other code though that
> > manages the mutex.
> 
> Ok, I was thinking something more along the lines of:
> 
> _m(Mutex::leaf, FormatBuffer("HeapRegionRemSet lock #"UINT32_FORMAT, hr-
> >hrs_index()), true),
> 
> FormatBuffer is the same class being used by err_msg used in asserts and has a 
> char* conversion operator, it encapsulates the char[] and snprintf call so you 
> don't need to worry about it.

I did not know about FormatBuffer. Undid the recent changes, using
FormatBuffer now. Thanks.

New webrev at
http://cr.openjdk.java.net/~tschatzl/8035406/webrev.2/

Testing:
jprt

Thanks a lot,
  Thomas