On 11/2/20 8:22 AM, Coleen Phillimore wrote:
On Mon, 2 Nov 2020 08:34:17 GMT, Stefan Karlsson <stef...@openjdk.org> wrote:

src/hotspot/share/prims/jvmtiTagMap.cpp line 126:

124:   // concurrent GCs. So fix it here once we have a lock or are
125:   // at a safepoint.
126:   // SetTag and GetTag should not post events!
I think it would be good to explain why. Otherwise, this just leaves the 
readers wondering why this is the case.
Maybe even move this comment to the set_tag/get_tag code.
I was trying to explain why there's a boolean there but I can put this comment 
at both get_tag and set_tag.

   // Check if we have to processing for concurrent GCs.

Typo: s/we have to processing/we have to do processing/


   // GetTag should not post events because the JavaThread has to
   // transition to native for the callback and this cannot stop for
   // safepoints with the hashmap lock held.
   check_hashmap(false);

-------------

PR: https://git.openjdk.java.net/jdk/pull/967

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