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From: Ed Maste <emaste@freebsd.org>
Date: Thu, 20 Nov 2014 18:32:20 -0500
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Subject: Re: pmcstat -z32 -G truncates callgraph to 8
To: Brendan Gregg <brendan.d.gregg@gmail.com>
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On 31 October 2014 01:26, Brendan Gregg <brendan.d.gregg@gmail.com> wrote:
>
> Yes. When I'm using profiling data, I like full stacks for making
> flame graphs. For the FreeBSD kernel, 32 frames should usually be
> enough (I have a flame graph that reaches 24 frames for the kernel,
> but no more). For user-level, I'd probably need ~100. So making the
> compiled-in default to 32 would hopefully be sufficient for most
> kernel profiling, and one would need to bump that up for deep
> user-level stacks. I guess this would also need
> PMC_CALLCHAIN_DEPTH_MAX = 128 to work.

I have a review up to bump the default to 32 and the maximum to 128:
https://reviews.freebsd.org/D1203