lkml.org 
[lkml]   [2018]   [Mar]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH v2 3/3] perf script: extend misc field decoding with switch out event type
From
Date

Append 'y' sign to 'S' tag designating the type of context switch out event so
'S' means preemption context switch and 'Sy' means synchronization context
switch. Documentation is extended to cover new presentation changes.

perf script --show-switch-events -F +misc -I -i system-wide.perf:

rcu_sched 8 [003] 113800.748548: PERF_RECORD_SWITCH_CPU_WIDE IN prev pid/tid: 0/0
perf 31479 [000] S 113800.748548: PERF_RECORD_SWITCH_CPU_WIDE OUT next pid/tid: 59/59
kworker/0:1 59 [000] 113800.748549: PERF_RECORD_SWITCH_CPU_WIDE IN prev pid/tid: 31479/31479
rcu_sched 8 [003] Sy 113800.748551: PERF_RECORD_SWITCH_CPU_WIDE OUT yield next pid/tid: 0/0
swapper 0 [003] 113800.748551: PERF_RECORD_SWITCH_CPU_WIDE IN prev pid/tid: 8/8

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
tools/perf/Documentation/perf-script.txt | 17 +++++++++--------
tools/perf/builtin-script.c | 5 ++++-
2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 36ec0257f8d3..80e94cbbf520 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -228,14 +228,15 @@ OPTIONS
For sample events it's possible to display misc field with -F +misc option,
following letters are displayed for each bit:

- PERF_RECORD_MISC_KERNEL K
- PERF_RECORD_MISC_USER U
- PERF_RECORD_MISC_HYPERVISOR H
- PERF_RECORD_MISC_GUEST_KERNEL G
- PERF_RECORD_MISC_GUEST_USER g
- PERF_RECORD_MISC_MMAP_DATA* M
- PERF_RECORD_MISC_COMM_EXEC E
- PERF_RECORD_MISC_SWITCH_OUT S
+ PERF_RECORD_MISC_KERNEL K
+ PERF_RECORD_MISC_USER U
+ PERF_RECORD_MISC_HYPERVISOR H
+ PERF_RECORD_MISC_GUEST_KERNEL G
+ PERF_RECORD_MISC_GUEST_USER g
+ PERF_RECORD_MISC_MMAP_DATA* M
+ PERF_RECORD_MISC_COMM_EXEC E
+ PERF_RECORD_MISC_SWITCH_OUT S
+ PERF_RECORD_MISC_SWITCH_OUT_YIELD Sy

$ perf script -F +misc ...
sched-messaging 1414 K 28690.636582: 4590 cycles ...
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 313c42423393..c0a3a7297c8a 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -657,8 +657,11 @@ static int perf_sample__fprintf_start(struct perf_sample *sample,
break;
case PERF_RECORD_SWITCH:
case PERF_RECORD_SWITCH_CPU_WIDE:
- if (has(SWITCH_OUT))
+ if (has(SWITCH_OUT)) {
ret += fprintf(fp, "S");
+ if (sample->misc & PERF_RECORD_MISC_SWITCH_OUT_YIELD)
+ ret += fprintf(fp, "y");
+ }
default:
break;
}
\
 
 \ /
  Last update: 2018-03-22 17:17    [W:0.196 / U:1.652 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site