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c1da8dd5c1
Currently it collects stack traces to max size then skip entries.
Because we don't have control how to skip perf callchains. But BPF can
do it with bpf_get_stackid() with a flag.
Say we have max-stack=4 and stack-skip=2, we get these stack traces.
Before: After:
.---> +---+ <--. .---> +---+ <--.
| | | | | | | |
| +---+ usable | +---+ |
max | | | max | | |
stack +---+ <--' stack +---+ usable
| | X | | | | |
| +---+ skip | +---+ |
| | X | | | | |
`---> +---+ `---> +---+ <--' <=== collection
| X |
+---+ skip
| X |
+---+
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20220912055314.744552-5-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.