[PATCH v2] perf: Support for Openembedded/Yocto -dbg packages

From: Ricardo Ribalda Delgado
Date: Wed Sep 18 2013 - 05:46:25 EST


On OpenEmbedded the symbol files are located under a .debug folder on
the same folder as the binary file.

This patch adds support for such files.

Without this patch on perf top you can see:

no symbols found in /usr/lib/gstreamer-1.0/libtheoraenc.so.1.1.2, maybe install
a debug package?

84.56% libtheoraenc.so.1.1.2 [.] 0x000000000000b346

With this patch symbols are shown:

19.06% libtheoraenc.so.1.1.2 [.] oc_int_frag_satd_thresh_mmxext
9.76% libtheoraenc.so.1.1.2 [.] oc_analyze_mb_mode_luma
5.58% libtheoraenc.so.1.1.2 [.] oc_qii_state_advance
4.84% libtheoraenc.so.1.1.2 [.] oc_enc_tokenize_ac
...

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
---

v2: Changes proposed by Ingo Molnar

-Improve changeset
-Improve multi-snprintf readability
-Code Style

tools/perf/util/dso.c | 42 +++++++++++++++++++++++++++++-------------
tools/perf/util/dso.h | 1 +
tools/perf/util/symbol.c | 1 +
3 files changed, 31 insertions(+), 13 deletions(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index e3c1ff8..43481e5 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -7,19 +7,20 @@
char dso__symtab_origin(const struct dso *dso)
{
static const char origin[] = {
- [DSO_BINARY_TYPE__KALLSYMS] = 'k',
- [DSO_BINARY_TYPE__VMLINUX] = 'v',
- [DSO_BINARY_TYPE__JAVA_JIT] = 'j',
- [DSO_BINARY_TYPE__DEBUGLINK] = 'l',
- [DSO_BINARY_TYPE__BUILD_ID_CACHE] = 'B',
- [DSO_BINARY_TYPE__FEDORA_DEBUGINFO] = 'f',
- [DSO_BINARY_TYPE__UBUNTU_DEBUGINFO] = 'u',
- [DSO_BINARY_TYPE__BUILDID_DEBUGINFO] = 'b',
- [DSO_BINARY_TYPE__SYSTEM_PATH_DSO] = 'd',
- [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE] = 'K',
- [DSO_BINARY_TYPE__GUEST_KALLSYMS] = 'g',
- [DSO_BINARY_TYPE__GUEST_KMODULE] = 'G',
- [DSO_BINARY_TYPE__GUEST_VMLINUX] = 'V',
+ [DSO_BINARY_TYPE__KALLSYMS] = 'k',
+ [DSO_BINARY_TYPE__VMLINUX] = 'v',
+ [DSO_BINARY_TYPE__JAVA_JIT] = 'j',
+ [DSO_BINARY_TYPE__DEBUGLINK] = 'l',
+ [DSO_BINARY_TYPE__BUILD_ID_CACHE] = 'B',
+ [DSO_BINARY_TYPE__FEDORA_DEBUGINFO] = 'f',
+ [DSO_BINARY_TYPE__UBUNTU_DEBUGINFO] = 'u',
+ [DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO] = 'o',
+ [DSO_BINARY_TYPE__BUILDID_DEBUGINFO] = 'b',
+ [DSO_BINARY_TYPE__SYSTEM_PATH_DSO] = 'd',
+ [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE] = 'K',
+ [DSO_BINARY_TYPE__GUEST_KALLSYMS] = 'g',
+ [DSO_BINARY_TYPE__GUEST_KMODULE] = 'G',
+ [DSO_BINARY_TYPE__GUEST_VMLINUX] = 'V',
};

if (dso == NULL || dso->symtab_type == DSO_BINARY_TYPE__NOT_FOUND)
@@ -64,6 +65,21 @@ int dso__binary_type_file(struct dso *dso, enum dso_binary_type type,
symbol_conf.symfs, dso->long_name);
break;

+ case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:{
+ char *last_slash;
+
+ last_slash = dso->long_name + dso->long_name_len;
+ while (last_slash != dso->long_name && *last_slash != '/')
+ last_slash--;
+
+ size -= snprintf(file, MIN(size, strlen(symbol_conf.symfs) +
+ (last_slash - dso->long_name) + 2), "%s%s",
+ symbol_conf.symfs, dso->long_name);
+ snprintf(file + strlen(file), size, ".debug%s",
+ last_slash);
+ break;
+ }
+
case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
if (!dso->has_build_id) {
ret = -1;
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index b793053..dbd9241 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -23,6 +23,7 @@ enum dso_binary_type {
DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
DSO_BINARY_TYPE__KCORE,
DSO_BINARY_TYPE__GUEST_KCORE,
+ DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
DSO_BINARY_TYPE__NOT_FOUND,
};

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 7eb0362..cd1dcc4 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -51,6 +51,7 @@ static enum dso_binary_type binary_type_symtab[] = {
DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
DSO_BINARY_TYPE__GUEST_KMODULE,
DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
+ DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
DSO_BINARY_TYPE__NOT_FOUND,
};

--
1.8.4.rc3

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