Commits
Wei Li committed 11db1ad4513
perf annotate: Fix getting source line failure
The output of "perf annotate -l --stdio xxx" changed since commit 425859ff0de33
("perf annotate: No need to calculate notes->start twice") removed notes->start
assignment in symbol__calc_lines(). It will get failed in
find_address_in_section() from symbol__tty_annotate() subroutine as the
a2l->addr is wrong. So the annotate summary doesn't report the line number of
source code correctly.
Before fix:
liwei@euler:~/main_code/hulk_work/hulk/tools/perf$ cat common_while_1.c
void hotspot_1(void)
{
volatile int i;
for (i = 0; i < 0x10000000; i++);
for (i = 0; i < 0x10000000; i++);
for (i = 0; i < 0x10000000; i++);
}
int main(void)
{
hotspot_1();
return 0;
}
liwei@euler:~/main_code/hulk_work/hulk/tools/perf$ gcc common_while_1.c -g -o common_while_1
liwei@euler:~/main_code/hulk_work/hulk/tools/perf$ sudo ./perf record ./common_while_1
[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 0.488 MB perf.data (12498 samples) ]
liwei@euler:~/main_code/hulk_work/hulk/tools/perf$ sudo ./perf annotate -l -s hotspot_1 --stdio
Sorted summary for file /home/liwei/main_code/hulk_work/hulk/tools/perf/common_while_1
----------------------------------------------
19.30 common_while_1[32]
19.03 common_while_1[4e]
19.01 common_while_1[16]
5.04 common_while_1[13]
4.99 common_while_1[4b]
4.78 common_while_1[2c]
4.77 common_while_1[10]
4.66 common_while_1[2f]
4.59 common_while_1[51]
4.59 common_while_1[35]
4.52 common_while_1[19]
4.20 common_while_1[56]
0.51 common_while_1[48]
Percent | Source code & Disassembly of common_while_1 for cycles:ppp (12480 samples, percent: local period)
-----------------------------------------------------------------------------------------------------------------
:
:
:
: Disassembly of section .text:
:
: 00000000000005fa <hotspot_1>:
: hotspot_1():
: void hotspot_1(void)
: {
0.00 : 5fa: push %rbp
0.00 : 5fb: mov %rsp,%rbp
: volatile int i;
:
: for (i = 0; i < 0x10000000; i++);
0.00 : 5fe: movl $0x0,-0x4(%rbp)
0.00 : 605: jmp 610 <hotspot_1+0x16>
0.00 : 607: mov -0x4(%rbp),%eax
common_while_1[10] 4.77 : 60a: add $0x1,%eax
common_while_1[13] 5.04 : 60d: mov %eax,-0x4(%rbp)
common_while_1[16] 19.01 : 610: mov -0x4(%rbp),%eax
common_while_1[19] 4.52 : 613: cmp $0xfffffff,%eax
0.00 : 618: jle 607 <hotspot_1+0xd>
: for (i = 0; i < 0x10000000; i++);
...
After fix:
liwei@euler:~/main_code/hulk_work/hulk/tools/perf$ sudo ./perf record ./common_while_1
[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 0.488 MB perf.data (12500 samples) ]
liwei@euler:~/main_code/hulk_work/hulk/tools/perf$ sudo ./perf annotate -l -s hotspot_1 --stdio
Sorted summary for file /home/liwei/main_code/hulk_work/hulk/tools/perf/common_while_1
----------------------------------------------
33.34 common_while_1.c:5
33.34 common_while_1.c:6
33.32 common_while_1.c:7
Percent | Source code & Disassembly of common_while_1 for cycles:ppp (12482 samples, percent: local period)
-----------------------------------------------------------------------------------------------------------------
:
:
:
: Disassembly of section .text:
:
: 00000000000005fa <hotspot_1>:
: hotspot_1():
: void hotspot_1(void)
: {
0.00 : 5fa: push %rbp
0.00 : 5fb: mov %rsp,%rbp
: volatile int i;
:
: for (i = 0; i < 0x10000000; i++);
0.00 : 5fe: movl $0x0,-0x4(%rbp)
0.00 : 605: jmp 610 <hotspot_1+0x16>
0.00 : 607: mov -0x4(%rbp),%eax
common_while_1.c:5 4.70 : 60a: add $0x1,%eax
4.89 : 60d: mov %eax,-0x4(%rbp)
common_while_1.c:5 19.03 : 610: mov -0x4(%rbp),%eax
common_while_1.c:5 4.72 : 613: cmp $0xfffffff,%eax
0.00 : 618: jle 607 <hotspot_1+0xd>
: for (i = 0; i < 0x10000000; i++);
0.00 : 61a: movl $0x0,-0x4(%rbp)
0.00 : 621: jmp 62c <hotspot_1+0x32>
0.00 : 623: mov -0x4(%rbp),%eax
common_while_1.c:6 4.54 : 626: add $0x1,%eax
4.73 : 629: mov %eax,-0x4(%rbp)
common_while_1.c:6 19.54 : 62c: mov -0x4(%rbp),%eax
common_while_1.c:6 4.54 : 62f: cmp $0xfffffff,%eax
...
Signed-off-by: Wei Li <liwei391@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: 425859ff0de33 ("perf annotate: No need to calculate notes->start twice")
Link: http://lkml.kernel.org/r/20190221095716.39529-1-liwei391@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>