Integrated: 8280289: Enhance debug pp() command with NMT info

[Zhengyu Gu]

On Thu, 20 Jan 2022 15:31:12 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> JDK-8275320 enhanced NMT malloc header, provided ability to identify if a pointer points to a malloc'd memory. Further,  JDK-8277822 enabled NMT for debug builds.
> 
> This is a good opportunity to integrate NMT to debug pp() command to provide useful information collected by NMT. 
> 
> For example:
> 
> NMT=summary
> 
> (gdb) call pp(0x7f2d9803db70)
> "Executing pp"
> 0x00007f2d9803db70 malloc'd 1576 bytes by Internal
> 
> (gdb) call pp(0x00007f4300a20000)
> "Executing pp"
> 0x00007f4300a20000 in mmap'd memory region [0x00007f4300a20000 - 0x00007f4310000000] by GC
> 
> 
> NMT=detail
> 
> 
> (gdb) call pp(0x7f2d9803db70)
> "Executing pp"
> 0x00007f2d9803db70 malloc'd 1576 bytes by Internal
> [0x00007f2d9f1b784b] G1Arguments::create_heap()+0x1b
> [0x00007f2d9f98a855] universe_init()+0x85
> [0x00007f2d9f2e0a97] init_globals()+0x37
> [0x00007f2d9f960acb] Threads::create_vm(JavaVMInitArgs*, bool*)+0x3db
> 
> (gdb) call pp(0x00007f4300a20000)
> "Executing pp"
> 0x00007f4300a20000 in mmap'd memory region [0x00007f4300a20000 - 0x00007f4310000000] by GC
> [0x00007f433dc49c7f] reserve_memory(char*, unsigned long, unsigned long, int, bool)+0x17f
> [0x00007f433dc4cf0b] ReservedSpace::reserve(unsigned long, unsigned long, unsigned long, char*, bool)+0x14b
> [0x00007f433dc4d527] ReservedSpace::initialize(unsigned long, unsigned long, unsigned long, char*, bool)+0x1c7
> [0x00007f433d949d40] ShenandoahHeap::initialize()+0x340

This pull request has now been integrated.

Changeset: a59d717f
Author:    Zhengyu Gu <zgu at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/a59d717fd65d523bb6f4fc57949054e904a149f1
Stats:     119 lines in 5 files changed: 89 ins; 6 del; 24 mod

8280289: Enhance debug pp() command with NMT info

Reviewed-by: stuefe, iklam

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

PR: https://git.openjdk.java.net/jdk/pull/7160