RFR: JDK-8269571: NMT should print total malloc bytes and invocation count

[Xin Liu]

On Tue, 29 Jun 2021 07:08:49 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> At the moment NMT prints a total of reserved and committed bytes. If one wants to know how much C-Heap the VM uses, one needs to add all numbers from the sub categories.
> 
> It would be helpful would NMT print the total number of malloced memory and additionally the malloc invocation count.
> 
> ----
> 
> This patch modifes the printout to print, in addition to totals, the number of malloced bytes, malloc invocation counts, and number of mmap reserved/committed bytes. This mirrors the way we print individual sub categories and allocation sites.
> 
> Before:
> 
> Native Memory Tracking:
> 
> Total: reserved=18489703KB, committed=1183967KB
> 
> 
> After:
> 
> 
> Native Memory Tracking:
> 
> Total: reserved=18491726KB, committed=1183178KB
>        malloc: 40590KB #13669
>        mmap:   reserved=18451136KB, committed=1142588KB
> 
> 
> Tests: Ran hotspot/runtime/NMT jtreg tests.

Marked as reviewed by xliu (Committer).

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PR: https://git.openjdk.java.net/jdk/pull/4622