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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>
This commit is contained in:
Ingo Molnar 2009-06-14 15:04:15 +02:00
parent 8465b05046
commit 3efa1cc99e
2 changed files with 53 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
tools/perf/builtin-record.c
View File

@ -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()

57
tools/perf/builtin-report.c
View File

@ -36,6 +36,7 @@ static int show_mask = SHOW_KERNEL | SHOW_USER | SHOW_HV;
static int dump_trace = 0;
#define dprintf(x...) do { if (dump_trace) printf(x); } while (0)
#define cdprintf(x...) do { if (dump_trace) color_fprintf(stdout, color, x); } while (0)
static int verbose;
static int full_paths;
@ -43,11 +44,19 @@ static int full_paths;
static unsigned long page_size;
static unsigned long mmap_window = 32;
struct ip_chain_event {
__u16 nr;
__u16 hv;
__u16 kernel;
__u16 user;
__u64 ips[];
};
struct ip_event {
struct perf_event_header header;
__u64 ip;
__u32 pid, tid;
__u64 period;
unsigned char __more_data[];
};
struct mmap_event {
@ -944,9 +953,13 @@ process_overflow_event(event_t *event, unsigned long offset, unsigned long head)
__u64 ip = event->ip.ip;
__u64 period = 1;
struct map *map = NULL;
void *more_data = event->ip.__more_data;
struct ip_chain_event *chain;
if (event->header.type & PERF_SAMPLE_PERIOD)
period = event->ip.period;
if (event->header.type & PERF_SAMPLE_PERIOD) {
period = *(__u64 *)more_data;
more_data += sizeof(__u64);
}
dprintf("%p [%p]: PERF_EVENT (IP, %d): %d: %p period: %Ld\n",
(void *)(offset + head),
@ -956,6 +969,22 @@ process_overflow_event(event_t *event, unsigned long offset, unsigned long head)
(void *)(long)ip,
(long long)period);
if (event->header.type & PERF_SAMPLE_CALLCHAIN) {
int i;
chain = (void *)more_data;
if (dump_trace) {
dprintf("... chain: u:%d, k:%d, nr:%d\n",
chain->user,
chain->kernel,
chain->nr);
for (i = 0; i < chain->nr; i++)
dprintf("..... %2d: %p\n", i, (void *)chain->ips[i]);
}
}
dprintf(" ... thread: %s:%d\n", thread->comm, thread->pid);
if (thread == NULL) {
@ -1098,30 +1127,34 @@ process_period_event(event_t *event, unsigned long offset, unsigned long head)
static void trace_event(event_t *event)
{
unsigned char *raw_event = (void *)event;
char *color = PERF_COLOR_BLUE;
int i, j;
if (!dump_trace)
return;
dprintf(".\n. ... raw event: size %d bytes\n", event->header.size);
dprintf(".");
cdprintf("\n. ... raw event: size %d bytes\n", event->header.size);
for (i = 0; i < event->header.size; i++) {
if ((i & 15) == 0)
dprintf(". %04x: ", i);
if ((i & 15) == 0) {
dprintf(".");
cdprintf(" %04x: ", i);
}
dprintf(" %02x", raw_event[i]);
cdprintf(" %02x", raw_event[i]);
if (((i & 15) == 15) || i == event->header.size-1) {
dprintf(" ");
cdprintf(" ");
for (j = 0; j < 15-(i & 15); j++)
dprintf(" ");
cdprintf(" ");
for (j = 0; j < (i & 15); j++) {
if (isprint(raw_event[i-15+j]))
dprintf("%c", raw_event[i-15+j]);
cdprintf("%c", raw_event[i-15+j]);
else
dprintf(".");
cdprintf(".");
}
dprintf("\n");
cdprintf("\n");
}
}
dprintf(".\n");