doubts about write barrier as for java garbage collection

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January 11, 2019, at 1:00 PM

I'm reading articles about Java GC. I know write barrier is used when reference updated. Young GC obtains old-to-young reference by scaning dirty entry of the card table and needn't scan the whole old region. My question is:
Is write barrier used whenever any reference is updated? If so, CMS collector needn't rescan young region for young-to-old reference in the final remark phase, because these references have been recorded in the card table, as young GC does.

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