I'm using the following code to create the events in C++. Everything
is working, but valgrind is reporting memory leak on line 08.
I suppose that the library is allocating some memory on arg structure
that needs to be freed. What should I free?
string name;
bool started;
pfm_perf_encode_arg_t arg;
perf_event_attr hw;
int fd;
01 int ret;
02 memset(&arg, 0, sizeof(arg));
03 memset(&hw, 0, sizeof(hw));
04 arg.attr = &hw;
05
06 started = false;
07 prevValue = value = 0;
08 ret = pfm_get_os_event_encoding(name.c_str(),
PFM_PLM0|PFM_PLM3|PFM_PLMH, PFM_OS_PERF_EVENT_EXT, &arg);
09 if (ret != PFM_SUCCESS) {
10 stringstream msgStr;
11 msgStr << "event " << name << ": " << pfm_strerror(ret) << endl;
12 throw msgStr.str();
13 }
14
15 // ABI compatibility
16 hw.size = sizeof(struct perf_event_attr);
17
18 // Setup steps
19 fd = -1;
20 hw.disabled = 1;
21 hw.read_format = PERF_FORMAT_SCALE;
22 fd = perf_event_open(&hw, -1, cpu, -1, 0);
23 if (fd == - 1) {
24 stringstream msgStr;
25 msgStr << "cannot attach event to CPU" << cpu << " " << name << endl;
26 throw msgStr.str();
27 }
Here is the valgind output:
==3482== 576 bytes in 2 blocks are definitely lost in loss record 1 of 1
==3482== at 0x4025230: malloc (vg_replace_malloc.c:236)
==3482== by 0x407BB3E: pfmlib_build_event_pattrs (pfmlib_common.c:794)
==3482== by 0x407C0BB: pfmlib_parse_event (pfmlib_common.c:972)
==3482== by 0x407FA72: pfmlib_perf_event_encode (pfmlib_perf_event.c:90)
==3482== by 0x407C34C: pfm_get_os_event_encoding (pfmlib_common.c:1108)
==3482== by 0x804E5BA: Event::Event(int, std::string const&) (Event.cpp:64)
...
==3482== LEAK SUMMARY:
==3482== definitely lost: 576 bytes in 2 blocks
==3482== indirectly lost: 0 bytes in 0 blocks
==3482== possibly lost: 0 bytes in 0 blocks
==3482== still reachable: 0 bytes in 0 blocks
==3482== suppressed: 0 bytes in 0 blocks
Thank you
--
Leonardo
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