perf tools: Check recorded kernel version when finding vmlinux
Currently vmlinux_path__init() only tries to find vmlinux file from
current directory, /boot and some canonical directories with version
number of the running kernel. This can be a problem when reporting old
data recorded on a kernel version not running currently.
We can use --symfs option for this but it's annoying for user to do it
always. As we already have the info in the perf.data file, it can be
changed to use it for the search automatically.
Before:
$ perf report
...
# Samples: 4K of event 'cpu-clock'
# Event count (approx.): 1067250000
#
# Overhead Command Shared Object Symbol
# ........ .......... ................. ..............................
71.87% swapper [kernel.kallsyms] [k] recover_probed_instruction
After:
# Overhead Command Shared Object Symbol
# ........ .......... ................. ....................
71.87% swapper [kernel.kallsyms] [k] native_safe_halt
This requires to change signature of symbol__init() to receive struct
perf_session_env *.
Reported-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1407825645-24586-14-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index c0464dc..d4da692 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -345,7 +345,7 @@
symbol_conf.priv_size = sizeof(struct annotation);
symbol_conf.try_vmlinux_path = true;
- ret = symbol__init();
+ ret = symbol__init(&annotate.session->header.env);
if (ret < 0)
goto out_delete;
diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index d91bfa6..ac5838e 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -329,7 +329,7 @@
return -1;
}
- if (symbol__init() < 0)
+ if (symbol__init(session ? &session->header.env : NULL) < 0)
goto out;
setup_pager();
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index c10cc44..190d0b6 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -1143,7 +1143,7 @@
argc = parse_options(argc, argv, options, diff_usage, 0);
- if (symbol__init() < 0)
+ if (symbol__init(NULL) < 0)
return -1;
if (data_init(argc, argv) < 0)
diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index 18eaefd..3a62b6b 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -462,7 +462,7 @@
if (inject.session == NULL)
return -ENOMEM;
- if (symbol__init() < 0)
+ if (symbol__init(&inject.session->header.env) < 0)
return -1;
ret = __cmd_inject(&inject);
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 349d9b4..2376218 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -692,7 +692,7 @@
usage_with_options(kmem_usage, kmem_options);
if (!strncmp(argv[0], "rec", 3)) {
- symbol__init();
+ symbol__init(NULL);
return __cmd_record(argc, argv);
}
@@ -700,7 +700,7 @@
if (session == NULL)
return -ENOMEM;
- symbol__init();
+ symbol__init(&session->header.env);
if (!strcmp(argv[0], "stat")) {
if (cpu__setup_cpunode_map())
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 7f2b555..14d03ed 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1064,7 +1064,7 @@
return -EINVAL;
}
- symbol__init();
+ symbol__init(&kvm->session->header.env);
if (!perf_session__has_traces(kvm->session, "kvm record"))
return -EINVAL;
@@ -1314,7 +1314,7 @@
kvm->opts.target.uid_str = NULL;
kvm->opts.target.uid = UINT_MAX;
- symbol__init();
+ symbol__init(NULL);
disable_buildid_cache();
use_browser = 0;
diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index d73580b..92790ed 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -865,7 +865,7 @@
return -ENOMEM;
}
- symbol__init();
+ symbol__init(&session->header.env);
if (!perf_session__has_traces(session, "lock record"))
goto out_delete;
diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index 80e57c8..8b4a87f 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -133,7 +133,7 @@
goto out_delete;
}
- if (symbol__init() < 0)
+ if (symbol__init(&session->header.env) < 0)
return -1;
printf("# PID, TID, IP, ADDR, LOCAL WEIGHT, DSRC, SYMBOL\n");
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index ca0251e..4db670d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -908,7 +908,7 @@
usage_with_options(record_usage, record_options);
}
- symbol__init();
+ symbol__init(NULL);
if (symbol_conf.kptr_restrict)
pr_warning(
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 041e93d..b9e0fca 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -798,7 +798,7 @@
}
}
- if (symbol__init() < 0)
+ if (symbol__init(&session->header.env) < 0)
goto error;
if (argc) {
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index dcd9ebf..f5874a2 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1462,7 +1462,7 @@
return -1;
}
- symbol__init();
+ symbol__init(&session->header.env);
if (perf_session__set_tracepoints_handlers(session, handlers))
goto out_delete;
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 9ca7a2d..37d2b60 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1732,7 +1732,7 @@
goto out_delete;
}
- if (symbol__init() < 0)
+ if (symbol__init(&session->header.env) < 0)
goto out_delete;
script.session = session;
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index df3b1c5..48eea6c 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -1607,7 +1607,7 @@
if (session == NULL)
return -ENOMEM;
- symbol__init();
+ symbol__init(&session->header.env);
(void)perf_header__process_sections(&session->header,
perf_data_file__fd(session->file),
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 0ab3ea7..4b0e15c 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1234,7 +1234,7 @@
symbol_conf.priv_size = sizeof(struct annotation);
symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
- if (symbol__init() < 0)
+ if (symbol__init(NULL) < 0)
return -1;
sort__setup_elide(stdout);
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 8a83bd8..d080b9c 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1411,7 +1411,7 @@
static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
{
- int err = symbol__init();
+ int err = symbol__init(NULL);
if (err)
return err;
@@ -2245,7 +2245,7 @@
if (session == NULL)
return -ENOMEM;
- if (symbol__init() < 0)
+ if (symbol__init(&session->header.env) < 0)
goto out;
trace->host = &session->machines.host;
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 6f8b01b..c6796d2 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -297,7 +297,7 @@
symbol_conf.sort_by_name = true;
symbol_conf.try_vmlinux_path = true;
- if (symbol__init() < 0)
+ if (symbol__init(NULL) < 0)
return -1;
if (skip != NULL)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 443225c..784ea42 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -79,7 +79,7 @@
int ret;
symbol_conf.sort_by_name = true;
- ret = symbol__init();
+ ret = symbol__init(NULL);
if (ret < 0) {
pr_debug("Failed to init symbol map.\n");
goto out;
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 009a9d0..ac098a3 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -15,6 +15,7 @@
#include "machine.h"
#include "symbol.h"
#include "strlist.h"
+#include "header.h"
#include <elf.h>
#include <limits.h>
@@ -1749,10 +1750,11 @@
zfree(&vmlinux_path);
}
-static int vmlinux_path__init(void)
+static int vmlinux_path__init(struct perf_session_env *env)
{
struct utsname uts;
char bf[PATH_MAX];
+ char *kernel_version;
vmlinux_path = malloc(sizeof(char *) * 5);
if (vmlinux_path == NULL)
@@ -1767,25 +1769,31 @@
goto out_fail;
++vmlinux_path__nr_entries;
- /* only try running kernel version if no symfs was given */
+ /* only try kernel version if no symfs was given */
if (symbol_conf.symfs[0] != 0)
return 0;
- if (uname(&uts) < 0)
- goto out_fail;
+ if (env) {
+ kernel_version = env->os_release;
+ } else {
+ if (uname(&uts) < 0)
+ goto out_fail;
- snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
+ kernel_version = uts.release;
+ }
+
+ snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", kernel_version);
vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
goto out_fail;
++vmlinux_path__nr_entries;
- snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
+ snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", kernel_version);
vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
goto out_fail;
++vmlinux_path__nr_entries;
snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
- uts.release);
+ kernel_version);
vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
goto out_fail;
@@ -1831,7 +1839,7 @@
return value;
}
-int symbol__init(void)
+int symbol__init(struct perf_session_env *env)
{
const char *symfs;
@@ -1846,7 +1854,7 @@
symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
sizeof(struct symbol));
- if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
+ if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
return -1;
if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 196b291..b95e3a3 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -262,7 +262,8 @@
int filename__read_debuglink(const char *filename, char *debuglink,
size_t size);
-int symbol__init(void);
+struct perf_session_env;
+int symbol__init(struct perf_session_env *env);
void symbol__exit(void);
void symbol__elf_init(void);
struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name);
