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authorMasami Hiramatsu <mhiramat@kernel.org>2017-01-04 12:30:19 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-01-04 11:44:22 -0300
commit8a937a25a7e3c19d5fb3f9d92f605cf5fda219d8 (patch)
treee8537a420e2528491ed1f8d454d71e8781c57072
parenteebc509b20881b92d62e317b2c073e57c5f200f0 (diff)
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perf probe: Fix to probe on gcc generated symbols for offline kernel
Fix perf-probe to show probe definition on gcc generated symbols for offline kernel (including cross-arch kernel image). gcc sometimes optimizes functions and generate new symbols with suffixes such as ".constprop.N" or ".isra.N" etc. Since those symbol names are not recorded in DWARF, we have to find correct generated symbols from offline ELF binary to probe on it (kallsyms doesn't correct it). For online kernel or uprobes we don't need it because those are rebased on _text, or a section relative address. E.g. Without this: $ perf probe -k build-arm/vmlinux -F __slab_alloc* __slab_alloc.constprop.9 $ perf probe -k build-arm/vmlinux -D __slab_alloc p:probe/__slab_alloc __slab_alloc+0 If you put above definition on target machine, it should fail because there is no __slab_alloc in kallsyms. With this fix, perf probe shows correct probe definition on __slab_alloc.constprop.9: $ perf probe -k build-arm/vmlinux -D __slab_alloc p:probe/__slab_alloc __slab_alloc.constprop.9+0 Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/148350060434.19001.11864836288580083501.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/util/probe-event.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 542e647..4a57c8a 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -610,6 +610,51 @@ error:
return ret ? : -ENOENT;
}
+/*
+ * Rename DWARF symbols to ELF symbols -- gcc sometimes optimizes functions
+ * and generate new symbols with suffixes such as .constprop.N or .isra.N
+ * etc. Since those symbols are not recorded in DWARF, we have to find
+ * correct generated symbols from offline ELF binary.
+ * For online kernel or uprobes we don't need this because those are
+ * rebased on _text, or already a section relative address.
+ */
+static int
+post_process_offline_probe_trace_events(struct probe_trace_event *tevs,
+ int ntevs, const char *pathname)
+{
+ struct symbol *sym;
+ struct map *map;
+ unsigned long stext = 0;
+ u64 addr;
+ int i;
+
+ /* Prepare a map for offline binary */
+ map = dso__new_map(pathname);
+ if (!map || get_text_start_address(pathname, &stext) < 0) {
+ pr_warning("Failed to get ELF symbols for %s\n", pathname);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ntevs; i++) {
+ addr = tevs[i].point.address + tevs[i].point.offset - stext;
+ sym = map__find_symbol(map, addr);
+ if (!sym)
+ continue;
+ if (!strcmp(sym->name, tevs[i].point.symbol))
+ continue;
+ /* If we have no realname, use symbol for it */
+ if (!tevs[i].point.realname)
+ tevs[i].point.realname = tevs[i].point.symbol;
+ else
+ free(tevs[i].point.symbol);
+ tevs[i].point.symbol = strdup(sym->name);
+ tevs[i].point.offset = addr - sym->start;
+ }
+ map__put(map);
+
+ return 0;
+}
+
static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
int ntevs, const char *exec)
{
@@ -671,7 +716,8 @@ post_process_kernel_probe_trace_events(struct probe_trace_event *tevs,
/* Skip post process if the target is an offline kernel */
if (symbol_conf.ignore_vmlinux_buildid)
- return 0;
+ return post_process_offline_probe_trace_events(tevs, ntevs,
+ symbol_conf.vmlinux_name);
reloc_sym = kernel_get_ref_reloc_sym();
if (!reloc_sym) {
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