Jiri Olsa b8a1962d17 perf script: Add stat-cpi.py script ... Adding stat-cpi.py as an example of how to do stat scripting. It computes the CPI metrics from cycles and instructions events. The CPI is based performance metric showing the Cycles Per Instructions ratio, which helps to identify cycles-hungry code. Following stat record/report/script combinations could be used: - get CPI for given workload $ perf stat -e cycles,instructions record ls SNIP Performance counter stats for 'ls': 2,904,431 cycles 3,346,878 instructions # 1.15 insns per cycle 0.001782686 seconds time elapsed $ perf script -s ./scripts/python/stat-cpi.py 0.001783: cpu -1, thread -1 -> cpi 0.867803 (2904431/3346878) $ perf stat -e cycles,instructions record ls | perf script -s ./scripts/python/stat-cpi.py SNIP 0.001730: cpu -1, thread -1 -> cpi 0.869026 (2928292/3369627) - get CPI systemwide: $ perf stat -e cycles,instructions -a -I 1000 record sleep 3 # time counts unit events 1.000158618 594,274,711 cycles (100.00%) 1.000158618 441,898,250 instructions 2.000350973 567,649,705 cycles (100.00%) 2.000350973 432,669,206 instructions 3.000559210 561,940,430 cycles (100.00%) 3.000559210 420,403,465 instructions 3.000670798 780,105 cycles (100.00%) 3.000670798 326,516 instructions $ perf script -s ./scripts/python/stat-cpi.py 1.000159: cpu -1, thread -1 -> cpi 1.344823 (594274711/441898250) 2.000351: cpu -1, thread -1 -> cpi 1.311972 (567649705/432669206) 3.000559: cpu -1, thread -1 -> cpi 1.336669 (561940430/420403465) 3.000671: cpu -1, thread -1 -> cpi 2.389178 (780105/326516) $ perf stat -e cycles,instructions -a -I 1000 record sleep 3 | perf script -s ./scripts/python/stat-cpi.py 1.000202: cpu -1, thread -1 -> cpi 1.035091 (940778881/908885530) 2.000392: cpu -1, thread -1 -> cpi 1.442600 (627493992/434974455) 3.000545: cpu -1, thread -1 -> cpi 1.353612 (741463930/547766890) 3.000622: cpu -1, thread -1 -> cpi 2.642110 (784083/296764) Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Tested-by: Kan Liang <kan.liang@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1452077397-31958-4-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>		2016-01-06 20:11:16 -03:00
..
arch	tools include: Add basic atomic.h implementation from the kernel sources	2015-05-08 16:11:05 -03:00
build	tools build feature: Use value assignment form for FEATURE-DUMP file	2016-01-06 20:11:14 -03:00
cgroup
firewire
hv	tools: hv: add a python script lsvmbus to list VMBus devices	2015-08-05 11:44:29 -07:00
iio	iio: generic_buffer: be helpful about enabling channels	2015-08-16 10:51:26 +01:00
include	perf tools: Move strlcpy() from perf to tools/lib/string.c	2015-12-16 16:09:39 -03:00
laptop/freefall	Move freefall program from Documentation/ to tools/	2015-06-08 16:42:07 -06:00
lguest	tools/lguest: Clean up include dir	2015-08-26 06:12:35 +02:00
lib	perf build: Use FEATURE-DUMP in bpf subproject	2016-01-06 20:11:14 -03:00
net	tools/net: Use include/uapi with __EXPORTED_HEADERS__	2015-11-15 17:24:33 -05:00
nfsd
perf	perf script: Add stat-cpi.py script	2016-01-06 20:11:16 -03:00
power	Merge branch 'pm-tools'	2015-11-16 22:57:02 +01:00
scripts
testing	nfit: Adjust for different _FIT and NFIT headers	2015-11-30 14:51:46 -08:00
thermal/tmon	tools/thermal: tmon: use pkg-config also for CFLAGS	2015-10-10 11:32:31 +08:00
time
usb	usb: patches for v4.4 merge window	2015-10-22 17:19:33 -07:00
virtio	tools/virtio: fix byteswap logic	2015-12-07 17:28:10 +02:00
vm	tools/vm/page-types.c: support KPF_IDLE	2015-11-20 16:17:32 -08:00
Makefile	tools: Fix selftests_install Makefile rule	2015-11-18 17:46:29 -03:00