Commit-ID: fbe2af45f6bd27ee69fd775303c936c3af4a4807
Gitweb: http://git.kernel.org/tip/fbe2af45f6bd27ee69fd775303c936c3af4a4807
Author: Adrian Hunter <adrian.hunter@xxxxxxxxx>
AuthorDate: Fri, 15 Aug 2014 22:08:39 +0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 22 Aug 2014 13:12:12 -0300
perf tools: Add machine__kernel_ip()
Add a function to determine if an address is in the kernel. This is
based on the kernel function kernel_ip().
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1408129739-17368-5-git-send-email-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/event.c | 6 +++---
tools/perf/util/machine.c | 23 +++++++++++++++++++++++
tools/perf/util/machine.h | 17 +++++++++++++++++
3 files changed, 43 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 1398c83..ed55819 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -784,9 +784,9 @@ try_again:
* "[vdso]" dso, but for now lets use the old trick of looking
* in the whole kernel symbol list.
*/
- if ((long long)al->addr < 0 &&
- cpumode == PERF_RECORD_MISC_USER &&
- machine && mg != &machine->kmaps) {
+ if (cpumode == PERF_RECORD_MISC_USER && machine &&
+ mg != &machine->kmaps &&
+ machine__kernel_ip(machine, al->addr)) {
mg = &machine->kmaps;
load_map = true;
goto try_again;
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 37f8dc5..e00daf0 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -32,6 +32,7 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
machine->symbol_filter = NULL;
machine->id_hdr_size = 0;
machine->comm_exec = false;
+ machine->kernel_start = 0;
machine->root_dir = strdup(root_dir);
if (machine->root_dir == NULL)
@@ -1559,3 +1560,25 @@ int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
return 0;
}
+
+int machine__get_kernel_start(struct machine *machine)
+{
+ struct map *map = machine__kernel_map(machine, MAP__FUNCTION);
+ int err = 0;
+
+ /*
+ * The only addresses above 2^63 are kernel addresses of a 64-bit
+ * kernel. Note that addresses are unsigned so that on a 32-bit system
+ * all addresses including kernel addresses are less than 2^32. In
+ * that case (32-bit system), if the kernel mapping is unknown, all
+ * addresses will be assumed to be in user space - see
+ * machine__kernel_ip().
+ */
+ machine->kernel_start = 1ULL << 63;
+ if (map) {
+ err = map__load(map, machine->symbol_filter);
+ if (map->start)
+ machine->kernel_start = map->start;
+ }
+ return err;
+}
diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index 61216e0..6a6bcc1 100644
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -36,6 +36,7 @@ struct machine {
struct list_head kernel_dsos;
struct map_groups kmaps;
struct map *vmlinux_maps[MAP__NR_TYPES];
+ u64 kernel_start;
symbol_filter_t symbol_filter;
pid_t *current_tid;
};
@@ -46,6 +47,22 @@ struct map *machine__kernel_map(struct machine *machine, enum map_type type)
return machine->vmlinux_maps[type];
}
+int machine__get_kernel_start(struct machine *machine);
+
+static inline u64 machine__kernel_start(struct machine *machine)
+{
+ if (!machine->kernel_start)
+ machine__get_kernel_start(machine);
+ return machine->kernel_start;
+}
+
+static inline bool machine__kernel_ip(struct machine *machine, u64 ip)
+{
+ u64 kernel_start = machine__kernel_start(machine);
+
+ return ip >= kernel_start;
+}
+
struct thread *machine__find_thread(struct machine *machine, pid_t pid,
pid_t tid);
struct comm *machine__thread_exec_comm(struct machine *machine,
--
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