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SubjectRe: [PATCH v2] perf trace: Fix missing handling of --call-graph dwarf
Em Mon, Jan 15, 2018 at 10:57:52AM -0300, Arnaldo Carvalho de Melo escreveu:
> > [root@f27 perf]# ./perf trace --no-syscalls --max-stack 4
> > -e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1
> > PING ::1(::1) 56 data bytes
> > 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.020 ms
> >
> > --- ::1 ping statistics ---
> > 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> > rtt min/avg/max/mdev = 0.020/0.020/0.020/0.000 ms
> > 0.000 probe_libc:inet_pton:(7ffbc5f768a0))
> > __inet_pton (inlined)
> > gaih_inet.constprop.7 (/usr/lib64/libc-2.26.so)
> > __GI_getaddrinfo (inlined)
> > main (/usr/bin/ping)
> > [root@f27 perf]#
> >
> >
> > --> Dwarf call graph and --max-stack 4 is also honoured.
>
> [root@jouet ~]# perf trace --no-syscalls -e probe_libc:inet_pton/call-graph=dwarf,max-stack=4/
> perf trace --no-syscalls --max-stack 4 -e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1
> Value too large for defined data type
> [root@jouet ~]#
>
> Grrr.


Got this one fixed with the following patch:

commit b78278e11f6992ca348a4b96aad3b2c0a9ecf0f0
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Mon Jan 15 11:07:58 2018 -0300

perf callchain: Fix attr.sample_max_stack setting

When setting the "dwarf" unwinder for a specific event and not
specifying the max-stack, the attr.sample_max_stack ended up using an
uninitialized callchain_param.max_stack, fix it by using designated
initializers for that callchain_param variable, zeroing all non
explicitely initialized struct members.

Here is what happened:

# perf trace -vv --no-syscalls --max-stack 4 -e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1
callchain: type DWARF
callchain: stack dump size 8192
perf_event_attr:
type 2
size 112
config 0x730
{ sample_period, sample_freq } 1
sample_type IP|TID|TIME|ADDR|CALLCHAIN|CPU|PERIOD|RAW|REGS_USER|STACK_USER|DATA_SRC
exclude_callchain_user 1
{ wakeup_events, wakeup_watermark } 1
sample_regs_user 0xff0fff
sample_stack_user 8192
sample_max_stack 50656
sys_perf_event_open failed, error -75
Value too large for defined data type
# perf trace -vv --no-syscalls --max-stack 4 -e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1
callchain: type DWARF
callchain: stack dump size 8192
perf_event_attr:
type 2
size 112
config 0x730
sample_type IP|TID|TIME|ADDR|CALLCHAIN|CPU|PERIOD|RAW|REGS_USER|STACK_USER|DATA_SRC
exclude_callchain_user 1
sample_regs_user 0xff0fff
sample_stack_user 8192
sample_max_stack 30448
sys_perf_event_open failed, error -75
Value too large for defined data type
#

Now the attr.sample_max_stack is set to zero and the above works as
expected:

# perf trace --no-syscalls --max-stack 4 -e probe_libc:inet_pton/call-graph=dwarf/ ping -6 -c 1 ::1
PING ::1(::1) 56 data bytes
64 bytes from ::1: icmp_seq=1 ttl=64 time=0.072 ms

--- ::1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.072/0.072/0.072/0.000 ms
0.000 probe_libc:inet_pton:(7feb7a998350))
__inet_pton (inlined)
gaih_inet.constprop.7 (/usr/lib64/libc-2.26.so)
__GI_getaddrinfo (inlined)
[0xffffaa39b6108f3f] (/usr/bin/ping)
#

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hendrick Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Richter <tmricht@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-qmqnot8y3zff5wh8kb7rkl4d@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index efa2e629a669..8f971a2301d1 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -731,14 +731,14 @@ static void apply_config_terms(struct perf_evsel *evsel,
struct perf_evsel_config_term *term;
struct list_head *config_terms = &evsel->config_terms;
struct perf_event_attr *attr = &evsel->attr;
- struct callchain_param param;
+ /* callgraph default */
+ struct callchain_param param = {
+ .record_mode = callchain_param.record_mode,
+ };
u32 dump_size = 0;
int max_stack = 0;
const char *callgraph_buf = NULL;

- /* callgraph default */
- param.record_mode = callchain_param.record_mode;
-
list_for_each_entry(term, config_terms, list) {
switch (term->type) {
case PERF_EVSEL__CONFIG_TERM_PERIOD:
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