Forwarding to serviceability alias where this question belongs I think.
Begin forwarded message:
> From: Brendan Gregg <brendan.d.gr...@gmail.com>
> Subject: system profilers and incomplete stacks
> Date: June 12, 2014 at 7:15:54 PM GMT+2
> To: hotspot-compiler-...@openjdk.java.net
>
> G'Day,
>
> Is there a way to run hotspot so that a system profiler (eg, DTrace, or Linux
> perf_events) can measure complete stacks? I often get incomplete, partial
> stacks, with one or a few frames only. I'm not worried about symbols right
> now, what I'd like is to walk stacks all the way down to thread start.
>
> I've been browsing the hotspot code, but haven't found out how yet. I suspect
> it's related to Java optimized frames, and has ditched the frame pointer. I
> was looking for an equivalent -fno-omit-frame-pointer option.
>
> Here's an example:
>
> # dtrace -n 'profile-99 /execname == "java"/ { @[jstack(100, 8000)] =
> count(); }'
> [...]
> org/mozilla/javascript/
> ScriptableObject.createSlot(Ljava/lang/String;II)Lorg/mozilla/javascript/ScriptableObject$Slot;*
> 0x884acce8200002da
> 1
>
> sun/nio/ch/SocketChannelImpl.read(Ljava/nio/ByteBuffer;)I*
> 0xffffffff20007f4b
> 1
>
>
> org/mozilla/javascript/ScriptRuntime.newObjectLiteral([Ljava/lang/Object;[Ljava/lang/Object;[ILorg/mozilla/javascript/Context;Lorg/mozilla/javascript/Scriptable;)Lorg/mozilla/javascript/Scriptable;*
> 0xa20000041
> 1
> [...]
>
> I see similar incomplete stacks with Linux perf_events. Oracle JDKs from 6 to
> 8, and OpenJDK.
>
> thanks,
>
> Brendan
> --
> http://www.brendangregg.com
