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Linux kernel source tree
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The --max-summary option is to limit the number of output lines for
syscall summary stats. The max applies to each entries like thread and
cgroups. For total summary, it will just print up to the given number.
For example,
$ sudo perf trace -as --max-summary 3 sleep 0.1
ThreadPoolServi (1011651), 114 events, 14.8%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
epoll_wait 38 0 95.589 0.000 2.515 11.153 28.98%
futex 9 0 0.040 0.002 0.004 0.014 28.63%
read 10 0 0.037 0.003 0.004 0.005 4.67%
sleep (1050529), 250 events, 32.4%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
clock_nanosleep 1 0 100.156 100.156 100.156 100.156 0.00%
execve 4 3 1.020 0.005 0.255 0.989 95.93%
openat 36 17 0.416 0.003 0.012 0.029 10.58%
...
And this is for per-cgroup summary using BPF.
$ sudo perf trace -as --max-summary 3 --summary-mode=cgroup --bpf-summary sleep 0.1
cgroup /user.slice/user-657345.slice/user@657345.service/session.slice/org.gnome.Shell@x11.service, 12 events
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
recvmsg 8 7 0.016 0.001 0.002 0.006 39.73%
ppoll 1 0 0.014 0.014 0.014 0.014 0.00%
write 2 0 0.010 0.002 0.005 0.008 61.02%
cgroup /user.slice/user-657345.slice/session-4.scope, 73 events
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
epoll_wait 8 0 13.461 0.010 1.683 12.235 89.66%
ioctl 20 0 0.204 0.001 0.010 0.113 54.01%
writev 11 0 0.164 0.004 0.015 0.042 20.34%
Reviewed-by: Howard Chu <howardchu95@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 reStructuredText 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.