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Andrew Vagin 3e76ac78b0 perf record: Add ability to record event period 
The problem is that when SAMPLE_PERIOD is not set, the kernel generates
a number of samples in proportion to an event's period. Number of these
samples may be too big and the kernel throttles all samples above a
defined limit.

E.g.: I want to trace when a process sleeps. I created a process which
sleeps for 1ms and for 4ms.  perf got 100 events in both cases.

swapper 0 [000] 1141.371830: sched_stat_sleep: comm=foo pid=1801 delay=1386750 [ns]
swapper 0 [000] 1141.369444: sched_stat_sleep: comm=foo pid=1801 delay=4499585 [ns]

In the first case a kernel want to send 4499585 events and in the second
case it wants to send 1386750 events.  perf-reports shows that process
sleeps in both places equal time.

Instead of this we can get only one sample with an attribute period. As
result we have less data transferring between kernel and user-space and
we avoid throttling of samples.

The patch "events: Don't divide events if it has field period" added a
kernel part of this functionality.

Acked-by: Arun Sharma <asharma@fb.com>
Cc: Arun Sharma <asharma@fb.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: devel@openvz.org
Link: http://lkml.kernel.org/r/1324391565-1369947-1-git-send-email-avagin@openvz.org
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-12-20 12:50:09 -02:00
..
include perf tools: Fix build against newer glibc 2011-08-18 07:24:53 -03:00
scripting-engines perf tools: Resolve machine earlier and pass it to perf_event_ops 2011-11-28 10:39:12 -02:00
ui perf symbols: Add nr_events to symbol_conf 2011-11-28 10:37:11 -02:00
abspath.c perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
alias.c perf_counter tools: Add more warnings and fix/annotate them 2009-07-01 12:49:48 +02:00
annotate.c perf symbols: Add nr_events to symbol_conf 2011-11-28 10:37:11 -02:00
annotate.h perf symbols: Add nr_events to symbol_conf 2011-11-28 10:37:11 -02:00
bitmap.c perf tools: Don't use code surrounded by __KERNEL__ 2010-05-02 12:00:44 -03:00
build-id.c perf tools: Rename perf_event_ops to perf_tool 2011-11-28 10:39:28 -02:00
build-id.h perf tools: Rename perf_event_ops to perf_tool 2011-11-28 10:39:28 -02:00
cache.h perf tools: Don't fallback to setup_pager unconditionally 2011-01-31 18:08:39 -02:00
callchain.c perf tools: Kill event_t typedef, use 'union perf_event' instead 2011-01-29 16:25:37 -02:00
callchain.h perf tools: Pass tool context in the the perf_event_ops functions 2011-11-28 10:38:56 -02:00
cgroup.c perf tools: Eliminate duplicate code and use PATH_MAX consistently 2011-11-28 10:11:04 -02:00
cgroup.h perf tool: Add cgroup support 2011-02-16 13:30:48 +01:00
color.c perf stat: Add -o and --append options 2011-08-18 07:46:13 -03:00
color.h perf hist: Replace ->print() routines by ->snprintf() equivalents 2010-04-02 16:28:15 -03:00
config.c doc: fix broken references 2011-09-27 18:08:04 +02:00
cpumap.c perf tools: Add missing cpu_map__delete() 2011-01-22 19:56:30 -02:00
cpumap.h perf tools: Add missing cpu_map__delete() 2011-01-22 19:56:30 -02:00
ctype.c perf tools: Move graph_line and graph_dotted_line from top 2009-11-23 21:55:20 +01:00
debug.c perf ui browser: Handle K_RESIZE in dialog windows 2011-10-26 13:15:07 -02:00
debug.h perf ui browser: Handle K_RESIZE in dialog windows 2011-10-26 13:15:07 -02:00
debugfs.c perf tools: Simplify debugfs mountpoint handling code 2011-11-28 10:11:28 -02:00
debugfs.h perf tools: Simplify debugfs mountpoint handling code 2011-11-28 10:11:28 -02:00
dwarf-aux.c perf probe: Filter out redundant inline-instances 2011-08-12 09:34:35 -03:00
dwarf-aux.h perf probe: Search concrete out-of-line instances 2011-08-12 09:32:10 -03:00
environment.c perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/ 2009-06-06 20:33:43 +02:00
event.c perf event: Introduce perf_event__fprintf 2011-12-02 11:06:37 -02:00
event.h perf tools: Add ability to synthesize event according to a sample 2011-12-12 08:44:00 -02:00
evlist.c perf evlist: Always do automatic allocation of pollfd and mmap structures 2011-11-29 08:05:52 -02:00
evlist.h perf evlist: Always do automatic allocation of pollfd and mmap structures 2011-11-29 08:05:52 -02:00
evsel.c perf record: Add ability to record event period 2011-12-20 12:50:09 -02:00
evsel.h perf tools: Save some loops using perf_evlist__id2evsel 2011-11-28 17:57:40 -02:00
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_counter tools: Move from Documentation/perf_counter/ to tools/perf/ 2009-06-06 20:33:43 +02:00
header.c perf tools: Rename perf_event_ops to perf_tool 2011-11-28 10:39:28 -02:00
header.h perf tools: Rename perf_event_ops to perf_tool 2011-11-28 10:39:28 -02:00
help.c perf tools: Remove some unused functions 2010-05-18 23:03:35 -03:00
help.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
hist.c perf python: Fix undefined symbol problem 2011-11-16 10:02:26 -02:00
hist.h Merge branch 'perf/urgent' into perf/core 2011-12-06 06:43:49 +01:00
hweight.c perf tools: Don't use code surrounded by __KERNEL__ 2010-05-02 12:00:44 -03:00
levenshtein.c perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/ 2009-06-06 20:33:43 +02:00
levenshtein.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
map.c perf session: Move threads to struct machine 2011-11-28 10:35:31 -02:00
map.h perf tools: Resolve machine earlier and pass it to perf_event_ops 2011-11-28 10:39:12 -02:00
pager.c perf_counter tools: Remove dead code 2009-06-27 06:06:39 +02:00
parse-events.c perf tools: Simplify debugfs mountpoint handling code 2011-11-28 10:11:28 -02:00
parse-events.h perf tools: Simplify debugfs mountpoint handling code 2011-11-28 10:11:28 -02:00
parse-options.c perf options: Type check all the remaining OPT_ variants 2010-05-17 16:22:41 -03:00
parse-options.h perf options: add OPT_CALLBACK_DEFAULT_NOOPT 2010-12-06 15:33:29 -02:00
path.c perf tools: add test for strlcpy() 2010-08-21 11:22:47 -03:00
PERF-VERSION-GEN perf: clear out make flags when calling kernel make kernelver 2011-06-15 22:12:55 +02:00
probe-event.c perf probe: Fix to show correct error string 2011-10-10 15:13:23 -04:00
probe-event.h perf probe: Add probed module in front of function 2011-07-15 16:19:08 -04:00
probe-finder.c perf probe: Fix regression of variable finder 2011-09-23 14:33:19 -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.c perf evlist: Fix grouping of multiple events 2011-10-26 10:25:02 -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
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 Merge branch 'perf/urgent' into perf/core 2011-12-06 06:43:49 +01:00
session.h perf tools: Add ability to synthesize event according to a sample 2011-12-12 08:44:00 -02:00
setup.py perf evlist: Introduce add_tracepoints method 2011-11-28 10:25:11 -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 hists browser: Elide DSO column when it is set to just one DSO, ditto for threads 2011-10-20 08:02:30 -02:00
sort.h perf hists: Don't free decayed entries if in the annotation browser 2011-10-13 08:01:33 -03:00
strbuf.c perf tools: Remove some unused functions 2010-05-18 23:03:35 -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 probe: Move strtailcmp to string.c 2011-07-15 16:00:47 -04:00
strlist.c perf probe: Fix --del to update current event list 2009-12-15 20:22:01 +01:00
strlist.h perf tools: Add for_each macros for strlist 2009-12-15 20:22:02 +01:00
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.c perf symbols: Increase symbol KSYM_NAME_LEN size 2011-10-21 11:01:18 -02:00
symbol.h perf symbols: Add nr_events to symbol_conf 2011-11-28 10:37:11 -02:00
thread.c perf session: Move threads to struct machine 2011-11-28 10:35:31 -02:00
thread.h perf tools: Resolve machine earlier and pass it to perf_event_ops 2011-11-28 10:39:12 -02:00
thread_map.c perf threads: Move thread_map to separate file 2011-01-24 10:59:00 -02:00
thread_map.h perf threads: Move thread_map to separate file 2011-01-24 10:59:00 -02:00
tool.h perf tools: Save some loops using perf_evlist__id2evsel 2011-11-28 17:57:40 -02:00
top.c perf top: Reuse the 'report' hist_entry/hists classes 2011-10-07 16:56:44 -03:00
top.h perf top: Stop using globals for tool state 2011-11-28 10:39:44 -02:00
trace-event-info.c perf tools: Eliminate duplicate code and use PATH_MAX consistently 2011-11-28 10:11:04 -02:00
trace-event-parse.c perf: Fix parsing of __print_flags() in TP_printk() 2011-12-05 13:28:47 -05:00
trace-event-read.c perf: Use read() instead of lseek() in trace_event_read.c:skip() 2010-05-20 08:37:17 +02:00
trace-event-scripting.c perf tools: Resolve machine earlier and pass it to perf_event_ops 2011-11-28 10:39:12 -02:00
trace-event.h perf tools: Resolve machine earlier and pass it to perf_event_ops 2011-11-28 10:39:12 -02:00
types.h perf tools: Fix 64 bit integer format strings 2011-01-22 23:41:57 -02:00
usage.c perf top: Fall back to cpu-clock-tick hrtimer sampling if no cycle counter available 2009-06-07 17:31:52 +02:00
util.c perf util: Move do_read from session to util 2011-01-03 16:50:55 -02:00
util.h perf probe: Move strtailcmp to string.c 2011-07-15 16:00:47 -04:00
values.c perf tools: Fix 64 bit integer format strings 2011-01-22 23:41:57 -02:00
values.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
wrapper.c perf tools: remove xstrndup, xmalloc, xzalloc 2010-05-18 23:05:28 -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