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remarkable-linux/tools/perf/util
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Ingo Molnar acddedfba0 perf tools: Speed up the perf build time by simplifying the perf --version string generation 
Building perf is pretty slow on trees that have a lot of commits
relative to the nearest Git tag. This slowness manifests itself during
version string generation:

 $ perf stat --null --repeat 3 --sync --pre "rm -f PERF-VERSION-FILE" util/PERF-VERSION-GEN
 PERF_VERSION = 3.7.rc3.1458.g5399b3b
 PERF_VERSION = 3.7.rc3.1458.g5399b3b
 PERF_VERSION = 3.7.rc3.1458.g5399b3b

 Performance counter stats for 'util/PERF-VERSION-GEN' (3 runs):

       2.857503976 seconds time elapsed                                          ( +-  0.22% )

The build can be even slower than that, when one over NFS volumes.

The reason for the slowness is that util/PERF-VERSION-GEN uses "git
describe" to generate the string, which has to count the "number of
commits distance" from the nearest tag - the ".1458." count in the
output above. For that Git had to extract and decompress 1458 Git
objects, which takes time and bandwidth.

But this "number of commits" value is mostly irrelevant in practice. We
either want to know an approximate tag name, or we want to know the
precise sha1.

So this patch simplifies the version string to:

 PERF_VERSION = 3.7.rc3.g5399b3b.dirty

which speeds up the version string generation script by an order of
magnitude:

 $ perf stat --null --repeat 3 --sync --pre "rm -f PERF-VERSION-FILE" util/PERF-VERSION-GEN
 PERF_VERSION = 3.7.rc3.g5399b3b.dirty
 PERF_VERSION = 3.7.rc3.g5399b3b.dirty
 PERF_VERSION = 3.7.rc3.g5399b3b.dirty

 Performance counter stats for 'util/PERF-VERSION-GEN' (3 runs):

       0.307633559 seconds time elapsed                                          ( +-  0.84% )

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: Borislav Petkov <bp@amd64.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20121030084600.GB8245@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2012-10-31 12:17:49 -02:00
..
include perf: Fix UAPI fallout 2012-10-14 12:22:52 -07:00
scripting-engines perf tools: Remove duplicated include from trace-event-python.c 2012-10-07 13:15:04 -03:00
abspath.c perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
alias.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
annotate.c perf tools: Move BUILD_ID_SIZE into build-id object 2012-10-29 11:35:32 -02:00
annotate.h perf tools: Try to find cross-built objdump path 2012-10-24 14:20:11 -02:00
bitmap.c perf tools: Add bitmap_or function into bitmap object 2012-02-13 23:28:10 -02:00
build-id.c perf tools: Move build_id__sprintf into build-id object 2012-10-29 11:34:46 -02:00
build-id.h perf tools: Move BUILD_ID_SIZE into build-id object 2012-10-29 11:35:32 -02:00
cache.h perf tools: Convert to HAVE_STRLCPY 2012-10-02 18:36:24 -03:00
callchain.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
callchain.h tools: perf: Fix typo in tools/perf 2012-09-01 08:49:34 -07:00
cgroup.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
cgroup.h perf tool: Add cgroup support 2011-02-16 13:30:48 +01:00
color.c perf tools: Use scnprintf where applicable 2012-03-14 12:36:19 -03:00
color.h perf hist: Replace ->print() routines by ->snprintf() equivalents 2010-04-02 16:28:15 -03:00
config.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
cpumap.c perf stat: Check PMU cpumask file 2012-09-17 13:12:02 -03:00
cpumap.h perf tools: Allow handling a NULL cpu_map as meaning "all cpus" 2012-09-26 12:41:14 -03:00
ctype.c perf tools: ctype.c only wants util.h 2012-02-13 23:17:40 -02:00
debug.c perf tools: Convert to GTK2_SUPPORT 2012-10-02 18:36:23 -03:00
debug.h perf tools: Convert to GTK2_SUPPORT 2012-10-02 18:36:23 -03:00
debugfs.c perf tools: Remove unused functions from debugfs object 2012-02-13 23:25:38 -02:00
debugfs.h perf tools: Remove unused functions from debugfs object 2012-02-13 23:25:38 -02:00
dso-test-data.c perf tools: replace mkostemp with mkstemp 2012-09-07 22:10:44 -03:00
dso.c perf tools: Move dso_* related functions into dso object 2012-10-29 11:37:25 -02:00
dso.h perf tools: Move dso_* related functions into dso object 2012-10-29 11:37:25 -02:00
dwarf-aux.c perf probe: Print an enum type variable in "enum variable-name" format when showing accessible variables 2012-09-27 10:58:57 -03:00
dwarf-aux.h perf probe: Search concrete out-of-line instances 2011-08-12 09:32:10 -03:00
environment.c
event.c perf tools: Don't stop synthesizing threads when one vanishes 2012-10-25 10:37:15 -02:00
event.h perf tools: Move BUILD_ID_SIZE into build-id object 2012-10-29 11:35:32 -02:00
evlist.c perf tools: Have the page size value available for all tools 2012-10-06 16:33:14 -03:00
evlist.h perf evlist: Remove some unused methods 2012-10-03 11:52:07 -03:00
evsel.c perf: Fix UAPI fallout 2012-10-14 12:22:52 -07:00
evsel.h perf: Fix UAPI fallout 2012-10-14 12:22:52 -07:00
exec_cmd.c perf tools: Makefile: Remove various and sundry cruft 2011-02-18 07:43:06 -02:00
exec_cmd.h perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
generate-cmdlist.sh perf tools: Convert to LIBELF_SUPPORT 2012-09-28 21:07:36 -03:00
header.c perf header: Add is_perf_magic() func 2012-10-29 11:56:59 -02:00
header.h perf header: Add is_perf_magic() func 2012-10-29 11:56:59 -02:00
help.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
help.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
hist.c perf hists: Add more helpers for hist entry stat 2012-10-04 13:36:18 -03:00
hist.h perf scripts browser: Add a browser for perf script 2012-10-29 11:52:53 -02:00
hweight.c perf tools: Don't use code surrounded by __KERNEL__ 2010-05-02 12:00:44 -03:00
intlist.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
intlist.h perf tools: Introduce intlist 2012-08-03 10:42:25 -03:00
levenshtein.c
levenshtein.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
machine.c perf machine: Carve up event processing specific from perf_tool 2012-10-06 16:34:13 -03:00
machine.h perf machine: Carve up event processing specific from perf_tool 2012-10-06 16:34:13 -03:00
map.c perf tools: Move build_id__sprintf into build-id object 2012-10-29 11:34:46 -02:00
map.h perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
pager.c perf tools: Fix pager on minimal-install embedded systems 2012-05-30 15:10:39 -03:00
parse-events-test.c perf test: Add automated tests for pmu sysfs translated events 2012-10-24 10:41:27 +02:00
parse-events.c perf tools: Move parse_events error printing to parse_events_options 2012-10-28 11:29:52 -02:00
parse-events.h perf tools: Add support to specify hw event as PMU event term 2012-10-24 10:41:27 +02:00
parse-events.l perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
parse-events.y perf tools: Add support to specify hw event as PMU event term 2012-10-24 10:41:27 +02:00
parse-options.c perf tools: Long option completion support for each subcommands 2012-10-02 18:36:44 -03:00
parse-options.h perf tools: Long option completion support for each subcommands 2012-10-02 18:36:44 -03:00
path.c perf tools: Convert to HAVE_STRLCPY 2012-10-02 18:36:24 -03:00
PERF-VERSION-GEN perf tools: Speed up the perf build time by simplifying the perf --version string generation 2012-10-31 12:17:49 -02:00
perf_regs.h perf tools: Convert to LIBUNWIND_SUPPORT 2012-10-02 17:56:01 -03:00
pmu.c perf tools: Fix PMU object alias initialization 2012-10-24 10:41:26 +02:00
pmu.h perf: Fix UAPI fallout 2012-10-14 12:22:52 -07:00
pmu.l perf tools: Add perf pmu object to access pmu format definition 2012-03-16 14:29:35 -03:00
pmu.y perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
probe-event.c perf tools: remove sscanf extension %as 2012-09-24 11:49:31 -03:00
probe-event.h perf probe: Provide perf interface for uprobes 2012-05-11 13:58:17 -03:00
probe-finder.c perf probe: Add union member access support 2012-09-14 15:48:08 -03:00
probe-finder.h perf tools: Eliminate duplicate code and use PATH_MAX consistently 2011-11-28 10:11:04 -02:00
pstack.c perf newt: Make <- zoom out filters 2010-05-14 20:05:21 -03:00
pstack.h perf ui: Move hists browser to util/ui/browsers/ 2010-08-10 16:11:08 -03:00
python-ext-sources Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-10-01 09:06:36 -07:00
python.c perf python: Initialize 'page_size' variable 2012-10-29 12:36:46 -02:00
quote.c perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
quote.h perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
rblist.c Account the nr_entries in rblist properly 2012-10-24 14:20:11 -02:00
rblist.h perf tools: Introducing rblist 2012-08-03 10:37:21 -03:00
run-command.c perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
run-command.h perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
session.c perf tools: Have the page size value available for all tools 2012-10-06 16:33:14 -03:00
session.h perf: Fix UAPI fallout 2012-10-14 12:22:52 -07:00
setup.py perf python: Properly link with libtraceevent 2012-10-20 02:43:08 +02:00
sigchain.c perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
sigchain.h perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
sort.c perf tools: Remove warnings on JIT samples for srcline sort key 2012-10-16 13:05:38 -03:00
sort.h perf diff: Add weighted diff computation way to compare hist entries 2012-10-05 14:10:42 -03:00
stat.c perf stat: Move stats related code to util/stat.c 2012-09-17 13:10:03 -03:00
stat.h perf stat: Move stats related code to util/stat.c 2012-09-17 13:10:03 -03:00
strbuf.c perf tools: Use scnprintf where applicable 2012-03-14 12:36:19 -03:00
strbuf.h perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
strfilter.c perf: Fix missing strndup declaration 2011-03-04 01:17:18 +01:00
strfilter.h perf tools: Add strfilter for general purpose string filter 2011-01-28 09:19:38 -02:00
string.c perf tools: Move strxfrchar into string object 2012-10-29 11:36:28 -02:00
strlist.c perf tools: Remove the node from rblist in strlist__remove 2012-09-05 17:36:42 -03:00
strlist.h perf tools: Change strlist to use the new rblist 2012-08-03 10:39:51 -03:00
svghelper.c perf timechart: Fix black idle boxes in the title 2011-02-28 08:56:14 +01:00
svghelper.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
symbol-elf.c perf symbols: Fix builds with NO_LIBELF set 2012-08-20 09:35:22 -03:00
symbol-minimal.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
symbol.c perf tools: Move dso_* related functions into dso object 2012-10-29 11:37:25 -02:00
symbol.h perf tools: Move dso_* related functions into dso object 2012-10-29 11:37:25 -02:00
sysfs.c perf tools: Add sysfs mountpoint interface 2012-02-13 23:27:15 -02:00
sysfs.h perf tools: Add sysfs mountpoint interface 2012-02-13 23:27:15 -02:00
target.c perf tools: Replace mempcpy with memcpy 2012-09-05 19:35:21 -03:00
target.h perf target: Add uses_mmap field 2012-05-17 12:32:54 -03:00
thread.c Merge branch 'perf/urgent' into perf/core 2012-10-24 10:20:57 +02:00
thread.h perf machine: Introduce find_thread method 2012-10-06 16:33:22 -03:00
thread_map.c perf tools: fix thread_map__new_by_pid_str() memory leak in error path 2012-05-25 11:40:59 -03:00
thread_map.h perf tools: Fix thread map that is type pid_t 2012-04-11 17:38:50 -03:00
tool.h perf tools: Save some loops using perf_evlist__id2evsel 2011-11-28 17:57:40 -02:00
top.c perf evlist: Introduce evsel list accessors 2012-08-15 10:14:18 -03:00
top.h perf tools: fix missing winsize definition 2012-09-07 22:07:32 -03:00
trace-event-info.c perf: Have perf use the new libtraceevent.a library 2012-04-25 13:28:48 +02:00
trace-event-parse.c perf tools: remove sscanf extension %as 2012-09-24 11:49:31 -03:00
trace-event-read.c perf tools: Have the page size value available for all tools 2012-10-06 16:33:14 -03:00
trace-event-scripting.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
trace-event.h perf tools: Support for DWARF CFI unwinding on post processing 2012-08-11 15:06:56 -03:00
types.h perf tools: Add union u64_swap type for swapping u64 data 2012-05-22 12:50:25 -03:00
unwind.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
unwind.h perf tools: Convert to LIBUNWIND_SUPPORT 2012-10-02 17:56:01 -03:00
usage.c perf target: Introduce perf_target__parse_uid() 2012-05-07 16:46:48 -03:00
util.c perf tools: Move hex2u64 into util object 2012-10-29 11:36:02 -02:00
util.h perf tools: Move strxfrchar into string object 2012-10-29 11:36:28 -02:00
values.c perf tools: Fix a memory leak on perf_read_values_destroy 2011-12-20 13:41:34 -02:00
values.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
vdso.c perf tools: Back [vdso] DSO with real data 2012-09-11 12:08:30 -03:00
vdso.h perf tools: Back [vdso] DSO with real data 2012-09-11 12:08:30 -03:00
wrapper.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
xyarray.c perf tools: Introduce event selectors 2011-01-03 16:39:04 -02:00
xyarray.h perf tools: Introduce event selectors 2011-01-03 16:39:04 -02:00