[PATCH v2 1/5] src: add eu-stacktrace tool

[Aaron Merey]

On Thu, Oct 17, 2024 at 2:49 PM Serhei Makarov <serhei@serhei.io> wrote:
>
> eu-stacktrace is a utility to process a stream of raw stack
> samples (such as those obtained from the Linux kernel's
> PERF_SAMPLE_STACK facility) into a stream of stack traces (such as
> those obtained from PERF_SAMPLE_CALLCHAIN), freeing other profiling
> utilities from having to implement their own backtracing logic.
>
> eu-stacktrace accepts data from a profiling tool via a pipe or
> fifo. The initial version of the tool works on x86 architectures and
> accepts data from Sysprof [1]. For future work, it will make sense
> to expand support to other profilers, in particular perf tool.
>
> Further patches in this series provide configury, docs, and improved
> diagnostics for tracking the method used to unwind each frame in the
> stack trace.
>
> [1]: The following patched version of Sysprof (upstream submission ETA
> ~very_soon) can produce data with stack samples:
>
> https://git.sr.ht/~serhei/sysprof-experiments/log/serhei/samples-via-fifo
>
> Invoking the patched sysprof with eu-stacktrace:
>
> $ sudo sysprof-cli --use-stacktrace
> $ sudo sysprof-cli --use-stacktrace --stacktrace-path=/path/to/eu-stacktrace
>
> Invoking the patched sysprof and eu-stacktrace manually through a fifo:
>
> $ mkfifo /tmp/test.fifo
> $ sudo eu-stacktrace --input /tmp/test.fifo --output test.syscap &
> $ sysprof-cli --sample-method=stack --use-fifo=/tmp/test.fifo test.syscap
>
> Note that sysprof polkit actions must be installed systemwide
> (e.g. installing the system sysprof package will provide these).
> Otherwise, "Action org.gnome.sysprof3.profile is not registered"
> error will result.
>
> * src/stacktrace.c: Add new tool.
>
> Signed-off-by: Serhei Makarov <serhei@serhei.io>

LGTM. eu-stacktrace is disabled by default even when sysprof headers
are found and when enabled it builds with no errors. Please go ahead
and merge.

Thanks,
Aaron