G'Day Volker,
On Fri, Dec 5, 2014 at 11:22 AM, Volker Simonis
wrote:
> Hi Brendan,
>
> I'm still not understanding who is taking the actual stack traces (let
> alone the symbols) in your examples. Is this done by 'perf' itself
> based only on the frame pointer?
perf is walking the frame pointers
Yes, that's clear. I didn't wanted to propose using "jstack -F"
directly. I just wanted to say that it's possible for an external tool
to get a "reasonable good" stack trace out of a JVM process at any
time and "jstack -F" can be taken as a boilerplate of how to do that.
That said, I still don't k
On Thu, Dec 4, 2014 at 2:55 PM, Brendan Gregg
wrote:
> G'Day,
>
> I've hacked hotspot to return the frame pointer, in part to see what this
> involves, and also to have a working prototype for analysis. Along with an
> agent to resolve symbols, this has allowed full stack profiling using Linux
>
Just to note that the implementation of “jstack -F” is not at all suitable for
profiling since has a very high overhead (it attaches a debugger to the
process).
/Staffan
> On 5 dec 2014, at 20:22, Volker Simonis wrote:
>
> Hi Brendan,
>
> I'm still not understanding who is taking the actual
Hi Brendan,
I'm still not understanding who is taking the actual stack traces (let
alone the symbols) in your examples. Is this done by 'perf' itself
based only on the frame pointer?
As I wrote before, this is pretty hard to get right for a JVM, but
there are good approximations. Have you looked
Hi Sasha,
thanks for looking at this change.
I'll incorporate your suggestions into the final version.
I'm just waiting for one more review before preparing a new webrev.
Regards,
Volker
On Fri, Dec 5, 2014 at 3:10 PM, Maynard Johnson wrote:
> On 12/04/2014 07:50 PM, Alexander Smundak wrote:
>
On 12/04/2014 07:50 PM, Alexander Smundak wrote:
> You are correct, but there no need to have this code for LE at all.
Agreed. I'm fine with adding the "&& !defined(ABI_ELFv2)" throughout that file
along with the "#if defined(ppc64)".
>
> BTW, a bit on nitpicking in the same file:
> +String en
On 12/05/2014 02:19 AM, David Holmes wrote:
On 3/12/2014 1:51 AM, Jaroslav Bachorik wrote:
On 12/02/2014 10:37 AM, David Holmes wrote:
On 1/12/2014 7:16 PM, Jaroslav Bachorik wrote:
On 11/27/2014 09:33 AM, Jaroslav Bachorik wrote:
On 11/27/2014 01:43 AM, David Holmes wrote:
On 26/11/2014 10:
