RFR: 8199067 [REDO] NMT: Enhance thread stack tracking

Zhengyu Gu zgu at redhat.com
Mon Mar 19 16:10:27 UTC 2018


submit-hs test still good.

Mach5 mach5-one-zgu-JDK-8199067-20180319-1419-14981: Builds PASSED. 



On 03/08/2018 09:08 AM, Zhengyu Gu wrote:
> The early change failed on some fast machine with many processors 
> running Linux OS. It reveals that there can be holes in thread's stack, 
> which throws off binary search for finding stack bottom.
> Besides, some threads (ConcurrentGCThread and WatcherThread, etc.) do 
> exit without notifying NMT, which can trip over NMT final reporting, as 
> their stacks became unmapped.
> This patch addresses above issues by searching whole address range for 
> committed regions. If the address range becomes invalid, simply reports 
> as not committed.
> GTest also updated.
> Bug: https://bugs.openjdk.java.net/browse/JDK-8199067
> Webrev: http://cr.openjdk.java.net/~zgu/8199067/webrev.00/index.html
> Test:
>    hotspot tier1 on Linux 64 and Windows x64.
>    Submit repo test came back clean.
>    Mach5 mach5-one-zgu-JDK-8199067-20180308-1218-13719: Builds PASSED. 
> Thanks,
> -Zhengyu

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