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| author | Ingo Molnar <mingo@elte.hu> | 2009-06-14 15:04:15 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-14 20:34:06 +0200 |
| commit | 3efa1cc99ec51bc7a7ae0011a16619fd20dbe6ea (patch) | |
| tree | db39c3b638bdaaf65382147c55a6cb60b12b9cbd /tools/perf/builtin-record.c | |
| parent | 8465b05046652cfde3d47692cab2e8ba962f140f (diff) | |
| download | lwn-3efa1cc99ec51bc7a7ae0011a16619fd20dbe6ea.tar.gz lwn-3efa1cc99ec51bc7a7ae0011a16619fd20dbe6ea.zip | |
perf record/report: Add call graph / call chain profiling
Add the first steps of call-graph profiling:
- add the -c (--call-graph) option to perf record
- parse the call-graph record and printout out under -D (--dump-trace)
The call-graph data is not put into the histogram yet, but it
can be seen that it's being processed correctly:
0x3ce0 [0x38]: event: 35
.
. ... raw event: size 56 bytes
. 0000: 23 00 00 00 05 00 38 00 d4 df 0e 81 ff ff ff ff #.....8........
. 0010: 60 0b 00 00 60 0b 00 00 03 00 00 00 01 00 02 00 `...`..........
. 0020: d4 df 0e 81 ff ff ff ff a0 61 ed 41 36 00 00 00 .........a.A6..
. 0030: 04 92 e6 41 36 00 00 00 .a.A6..
.
0x3ce0 [0x38]: PERF_EVENT (IP, 5): 2912: 0xffffffff810edfd4 period: 1
... chain: u:2, k:1, nr:3
..... 0: 0xffffffff810edfd4
..... 1: 0x3641ed61a0
..... 2: 0x3641e69204
... thread: perf:2912
...... dso: [kernel]
This shows a 3-entry call-graph: with 1 kernel-space and two user-space
entries
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-record.c')
| -rw-r--r-- | tools/perf/builtin-record.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 0f5771f615da..a177a591b52c 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -37,6 +37,7 @@ static pid_t target_pid = -1; static int inherit = 1; static int force = 0; static int append_file = 0; +static int call_graph = 0; static int verbose = 0; static long samples; @@ -351,11 +352,16 @@ static void create_counter(int counter, int cpu, pid_t pid) int track = 1; attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID; + if (freq) { attr->sample_type |= PERF_SAMPLE_PERIOD; attr->freq = 1; attr->sample_freq = freq; } + + if (call_graph) + attr->sample_type |= PERF_SAMPLE_CALLCHAIN; + attr->mmap = track; attr->comm = track; attr->inherit = (cpu < 0) && inherit; @@ -555,6 +561,8 @@ static const struct option options[] = { "profile at this frequency"), OPT_INTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), + OPT_BOOLEAN('g', "call-graph", &call_graph, + "do call-graph (stack chain/backtrace) recording"), OPT_BOOLEAN('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"), OPT_END() |