@@ -1652,3 +1652,10 @@ int dso__strerror_load(struct dso *dso, char *buf, size_t buflen)
scnprintf(buf, buflen, "%s", dso_load__error_str[idx]);
return 0;
}
+
+bool is_perf_pid_map_name(const char *dso_name)
+{
+ int tid;
+
+ return sscanf(dso_name, "/tmp/perf-%d.map", &tid) == 1;
+}
@@ -809,4 +809,7 @@ void reset_fd_limit(void);
u64 dso__find_global_type(struct dso *dso, u64 addr);
u64 dso__findnew_global_type(struct dso *dso, u64 addr, u64 offset);
+/* Check if dso name is of format "/tmp/perf-%d.map" */
+bool is_perf_pid_map_name(const char *dso_name);
+
#endif /* __PERF_DSO */
@@ -1799,7 +1799,8 @@ int dso__load(struct dso *dso, struct map *map)
const char *map_path = dso__long_name(dso);
mutex_lock(dso__lock(dso));
- perfmap = strncmp(dso__name(dso), "/tmp/perf-", 10) == 0;
+ perfmap = is_perf_pid_map_name(map_path);
+
if (perfmap) {
if (dso__nsinfo(dso) &&
(dso__find_perf_map(newmapname, sizeof(newmapname),
Perf test for perf probe of function from different CU fails as below: ./perf test -vv "test perf probe of function from different CU" 116: test perf probe of function from different CU: --- start --- test child forked, pid 2679 Failed to find symbol foo in /tmp/perf-uprobe-different-cu-sh.Msa7iy89bx/testfile Error: Failed to add events. --- Cleaning up --- "foo" does not hit any event. Error: Failed to delete events. ---- end(-1) ---- 116: test perf probe of function from different CU : FAILED! The test does below to probe function "foo" : # gcc -g -Og -flto -c /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-foo.c -o /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-foo.o # gcc -g -Og -c /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-main.c -o /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-main.o # gcc -g -Og -o /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-foo.o /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-main.o # ./perf probe -x /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile foo Failed to find symbol foo in /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile Error: Failed to add events. Perf probe fails to find symbol foo in the executable placed in /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7 Simple reproduce: # mktemp -d /tmp/perf-checkXXXXXXXXXX /tmp/perf-checkcWpuLRQI8j # gcc -g -o test test.c # cp test /tmp/perf-checkcWpuLRQI8j/ # nm /tmp/perf-checkcWpuLRQI8j/test | grep foo 00000000100006bc T foo # ./perf probe -x /tmp/perf-checkcWpuLRQI8j/test foo Failed to find symbol foo in /tmp/perf-checkcWpuLRQI8j/test Error: Failed to add events. But it works with any files like /tmp/perf/test. Only for patterns with "/tmp/perf-", this fails. Further debugging, commit 80d496be89ed ("perf report: Add support for profiling JIT generated code") added support for profiling JIT generated code. This patch handles dso's of form "/tmp/perf-$PID.map" . The check used "if (strncmp(self->name, "/tmp/perf-", 10) == 0)" to match "/tmp/perf-$PID.map". With this commit, any dso in /tmp/perf- folder will be considered separately for processing (not only JIT created map files ). Fix this by changing the string pattern to check for "/tmp/perf-%d.map". Add a helper function is_perf_pid_map_name to do this check. With the fix, # ./perf test "test perf probe of function from different CU" 117: test perf probe of function from different CU : Ok Signed-off-by: Athira Rajeev<atrajeev@linux.vnet.ibm.com> --- Changelog: v2 -> v2: Addressed review comments from Adrian. Added helper function is_perf_pid_map_name to check dso name of form "/tmp/perf-%d.map". Used sscanf instead of regex comparison. tools/perf/util/dso.c | 7 +++++++ tools/perf/util/dso.h | 3 +++ tools/perf/util/symbol.c | 3 ++- 3 files changed, 12 insertions(+), 1 deletion(-)