mirror of
https://github.com/torvalds/linux.git
synced 2024-09-21 07:23:06 +00:00
A mirror of the official Linux kernel repository just in case
4241eabf59
This new benchmark finds the total time that is taken to open, mmap, enable, disable, munmap, close an evlist (time taken for new, create_maps, config, delete is not counted in). The evlist can be configured as in perf-record using the -a,-C,-e,-u,--per-thread,-t,-p options. The events can be duplicated in the evlist to quickly test performance with many events using the -n options. Furthermore, also the number of iterations used to calculate the statistics is customizable. Examples: - Open one dummy event system-wide: $ sudo ./perf bench internals evlist-open-close Number of cpus: 4 Number of threads: 1 Number of events: 1 (4 fds) Number of iterations: 100 Average open-close took: 613.870 usec (+- 32.852 usec) - Open the group '{cs,cycles}' on CPU 0 $ sudo ./perf bench internals evlist-open-close -e '{cs,cycles}' -C 0 Number of cpus: 1 Number of threads: 1 Number of events: 2 (2 fds) Number of iterations: 100 Average open-close took: 8503.220 usec (+- 252.652 usec) - Open 10 'cycles' events for user 0, calculate average over 100 runs $ sudo ./perf bench internals evlist-open-close -e cycles -n 10 -u 0 -i 100 Number of cpus: 4 Number of threads: 328 Number of events: 10 (13120 fds) Number of iterations: 100 Average open-close took: 180043.140 usec (+- 2295.889 usec) Committer notes: Replaced a deprecated bzero() call with designated initialized zeroing. Added some missing evlist allocation checks, one noted by Riccardo on the mailing list. Minor cosmetic changes (sent in private). Signed-off-by: Riccardo Mancini <rickyman7@gmail.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20210809201101.277594-1-rickyman7@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
||
---|---|---|
arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
LICENSES | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
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 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.