RFR(s): 8152188: Allow CMSBitMapYieldQuantum for BitMap::clear_range and clear_large_range (original) (raw)

sangheon sangheon.kim at oracle.com
Thu Mar 31 23:37:34 UTC 2016

Hi all,

Could I have a couple of reviews for this change?

CMSBitMapYieldQuantum can be changed by command-line and different values on this flag result in different ranges at BitMap when we clear the bitmap by BitMap::clear_large_range(). And if we can't satisfy the criteria for 'large' range of '32', we will face an assert from BitMap::clear_large_range(). As we already have clear_range(), it would be better to call it instead of firing an assert. If we change to use 'clear_range()' will resolve the problem as well, but I didn't want to change like that which would result in performance regression. In addition, we need a constraint to limit its maximum not to exceed the mark bitmap size.

CR: https://bugs.openjdk.java.net/browse/JDK-8152188 Webrev: http://cr.openjdk.java.net/~sangheki/8152188/webrev.00 Testing: JPRT, runtime/commandline JTREG tests for all platforms.

Thanks, Sangheon

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