Frederic Weisbecker 0983cc0dbc perf tools: Fix trace events storms due to weight demux ... Trace events have a period (weight) of 1 by default. This can be overriden on events definition by using the __perf_count() macro. For example, the sched_stat_runtime() is weighted with the runtime of the task that fired the event. By default, perf handles such weighted event by dividing it into individual events carrying a weight of 1. For example if sched_stat_runtime is fired and the task has run 5000000 nsecs, perf divides it into 5000000 events in the buffer. This behaviour makes weighted events unusable because they quickly fullfill the buffers and we lose most events. The commit 5d81e5cfb3 ("events: Don't divide events if it has field period") solves this problem by sending only one event when PERF_SAMPLE_PERIOD flag is set. The weight is carried in the sample itself such that we don't need to demultiplex it anymore. This patch provides the last missing piece to use this feature by setting PERF_SAMPLE_PERIOD from perf tools when we deal with trace events. Before: $ ./perf record -e sched:* -a sleep 1 [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 1.619 MB perf.data (~70749 samples) ] Warning: Processed 16909 events and lost 1 chunks! Check IO/CPU overload! $ ./perf script perf 1894 [003] 824.898327: sched_migrate_task: comm=perf pid=1898 prio=120 orig_cpu=2 dest_cpu=0 perf 1894 [003] 824.898335: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898336: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898337: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898338: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898339: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898340: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898341: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] [...] After: $ ./perf record -e sched:* -a sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.074 MB perf.data (~3228 samples) ] $ ./perf script perf 1461 [000] 554.286957: sched_migrate_task: comm=perf pid=1465 prio=120 orig_cpu=3 dest_cpu=1 perf 1461 [000] 554.286964: sched_stat_sleep: comm=perf pid=1465 delay=133047190 [ns] perf 1461 [000] 554.286967: sched_wakeup: comm=perf pid=1465 prio=120 success=1 target_cpu=001 swapper 0 [001] 554.286976: sched_stat_wait: comm=perf pid=1465 delay=0 [ns] swapper 0 [001] 554.286983: sched_switch: prev_comm=swapper/1 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=perf [...] Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1342631456-7233-1-git-send-email-fweisbec@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>		2012-07-25 11:32:06 -03:00
..
firewire
hv	Tools: hv: verify origin of netlink connector message	2012-06-10 00:29:46 +09:00
include/tools	tools/include: Add byteshift headers for endian access	2012-02-28 10:22:51 -08:00
lguest	lguest: move the lguest tool to the tools directory	2012-01-12 15:44:47 +10:30
lib/traceevent	tools lib traceevent: Cleanup realloc use	2012-07-04 13:40:31 +09:00
nfsd	NFSD: Added fault injection script	2011-11-07 21:10:47 -05:00
perf	perf tools: Fix trace events storms due to weight demux	2012-07-25 11:32:06 -03:00
power	tools/power turbostat: fix IVB support	2012-06-03 23:47:49 -04:00
scripts	perf: Build libtraceevent.a	2012-04-25 13:01:40 +02:00
testing	syscalls, x86: add __NR_kcmp syscall	2012-05-31 17:49:32 -07:00
usb	USB: testusb: add path /dev/bus/usb to default search paths for usbfs	2012-05-15 08:41:13 -07:00
virtio	virtio/tools: add delayed interupt mode	2012-05-02 18:22:14 +03:00
vm	tools/vm/page-types.c: cleanups	2012-05-29 16:22:21 -07:00
Makefile	tools: Connect to the kernel build system	2012-04-11 15:00:17 -03:00