Wed, 18 Apr 2018 11:36:48 +0200 8201490: Improve concurrent mark keep alive closure performance
tschatzl [Wed, 18 Apr 2018 11:36:48 +0200] rev 49809
8201490: Improve concurrent mark keep alive closure performance Summary: Avoid doing marking work unless absolutely required. Reviewed-by: sjohanss, kbarrett
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