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Message-ID: <20140730205521.GU7831@kernel.org>
Date: Wed, 30 Jul 2014 17:55:21 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Minchan Kim <minchan@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Ingo Molnar <mingo@...nel.org>,
Paul Mackerras <paulus@...ba.org>,
Namhyung Kim <namhyung.kim@....com>,
LKML <linux-kernel@...r.kernel.org>,
Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 1/2] perf tools: Ensure --symfs ends with '/'
Em Wed, Jul 30, 2014 at 12:19:32PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Jul 30, 2014 at 08:52:36AM +0900, Namhyung Kim escreveu:
> > I also thought about that way first but changed my mind to the current
> > approach because I don't want to change current behavior.
>
> > I worried about the common case which has empty symfs. By your patch,
> > it makes a pathname absolute even with an empty symfs - I can see most
> > filenames are already absolute paths but I'm not 100% sure it's always
> > the case.
>
> Yeah, after doing some research on the tools/perf/ 'git log' I got your point,
> we can't add the / after symfs usages when it is "", i.e. we need something
> like:
>
> ("%s%s%s, symfs, symfs[0] ? "/" : "", dso_name)
>
> I.e. the equivalent of this:
>
> [acme@zoo linux]$ python
> >>> import os
> >>> symfs = ""
> >>> os.path.join(symfs, "dso_path")
> 'dso_path'
> >>> symfs = "/home/acme/embedded_device_dsos"
> >>> os.path.join(symfs, "dso_path")
> '/home/acme/embedded_device_dsos/dso_path'
> >>>
>
> I'll try and get that in place.
Ok, the patch below should implement it just like above, if Minchan
could please retest, I did just minimal testing, will do more later.
- Arnaldo
---
>From d0240769e7d844ee21c1e8fc5cc57627c666f155 Mon Sep 17 00:00:00 2001
From: Arnaldo Carvalho de Melo <acme@...nel.org>
Date: Tue, 29 Jul 2014 10:21:58 -0300
Subject: [PATCH 1/1] perf symbols: Make sure --symfs usage includes the path
separator
Minchan reported that perf failed to load vmlinux if --symfs argument
doesn't end with '/' character.
Fix it by making sure that the '/' path separator is used when composing
pathnames with a --symfs provided directory name.
Reported-by: Minchan Kim <minchan@...nel.org>
Tested-by: Minchan Kim <minchan@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/n/tip-8n4s6b6zvsez5ktanw006125@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/util/annotate.c | 9 +++------
tools/perf/util/dso.c | 28 +++++++++++++---------------
tools/perf/util/symbol.c | 3 +--
tools/perf/util/symbol.h | 9 +++++++++
tools/perf/util/util.h | 16 ++++++++++++++++
5 files changed, 42 insertions(+), 23 deletions(-)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 809b4c50beae..7745fec01a6b 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -899,10 +899,8 @@ int symbol__annotate(struct symbol *sym, struct map *map, size_t privsize)
struct kcore_extract kce;
bool delete_extract = false;
- if (filename) {
- snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
- symbol_conf.symfs, filename);
- }
+ if (filename)
+ symbol__join_symfs(symfs_filename, filename);
if (filename == NULL) {
if (dso->has_build_id) {
@@ -922,8 +920,7 @@ fallback:
* DSO is the same as when 'perf record' ran.
*/
filename = (char *)dso->long_name;
- snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
- symbol_conf.symfs, filename);
+ symbol__join_symfs(symfs_filename, filename);
free_filename = false;
}
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 90d02c661dd4..bdafd306fb52 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -37,6 +37,7 @@ int dso__read_binary_type_filename(const struct dso *dso,
{
char build_id_hex[BUILD_ID_SIZE * 2 + 1];
int ret = 0;
+ size_t len;
switch (type) {
case DSO_BINARY_TYPE__DEBUGLINK: {
@@ -60,26 +61,25 @@ int dso__read_binary_type_filename(const struct dso *dso,
break;
case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
- snprintf(filename, size, "%s/usr/lib/debug%s.debug",
- symbol_conf.symfs, dso->long_name);
+ len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
+ snprintf(filename + len, size - len, "%s.debug", dso->long_name);
break;
case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
- snprintf(filename, size, "%s/usr/lib/debug%s",
- symbol_conf.symfs, dso->long_name);
+ len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
+ snprintf(filename + len, size - len, "%s", dso->long_name);
break;
case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
{
const char *last_slash;
- size_t len;
size_t dir_size;
last_slash = dso->long_name + dso->long_name_len;
while (last_slash != dso->long_name && *last_slash != '/')
last_slash--;
- len = scnprintf(filename, size, "%s", symbol_conf.symfs);
+ len = __symbol__join_symfs(filename, size, "");
dir_size = last_slash - dso->long_name + 2;
if (dir_size > (size - len)) {
ret = -1;
@@ -100,26 +100,24 @@ int dso__read_binary_type_filename(const struct dso *dso,
build_id__sprintf(dso->build_id,
sizeof(dso->build_id),
build_id_hex);
- snprintf(filename, size,
- "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
- symbol_conf.symfs, build_id_hex, build_id_hex + 2);
+ len = __symbol__join_symfs(filename, size, "/usr/lib/debug/.build-id/");
+ snprintf(filename + len, size - len, "%.2s/%s.debug",
+ build_id_hex, build_id_hex + 2);
break;
case DSO_BINARY_TYPE__VMLINUX:
case DSO_BINARY_TYPE__GUEST_VMLINUX:
case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
- snprintf(filename, size, "%s%s",
- symbol_conf.symfs, dso->long_name);
+ __symbol__join_symfs(filename, size, dso->long_name);
break;
case DSO_BINARY_TYPE__GUEST_KMODULE:
- snprintf(filename, size, "%s%s%s", symbol_conf.symfs,
- root_dir, dso->long_name);
+ path__join3(filename, size, symbol_conf.symfs,
+ root_dir, dso->long_name);
break;
case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
- snprintf(filename, size, "%s%s", symbol_conf.symfs,
- dso->long_name);
+ __symbol__join_symfs(filename, size, dso->long_name);
break;
case DSO_BINARY_TYPE__KCORE:
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index eb06746b06b2..f134ec138934 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1468,8 +1468,7 @@ int dso__load_vmlinux(struct dso *dso, struct map *map,
if (vmlinux[0] == '/')
snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
else
- snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
- symbol_conf.symfs, vmlinux);
+ symbol__join_symfs(symfs_vmlinux, vmlinux);
if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index e7295e93cff9..196b29104276 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -13,6 +13,7 @@
#include <libgen.h>
#include "build-id.h"
#include "event.h"
+#include "util.h"
#ifdef HAVE_LIBELF_SUPPORT
#include <libelf.h>
@@ -143,6 +144,14 @@ struct symbol_conf {
};
extern struct symbol_conf symbol_conf;
+
+static inline int __symbol__join_symfs(char *bf, size_t size, const char *path)
+{
+ return path__join(bf, size, symbol_conf.symfs, path);
+}
+
+#define symbol__join_symfs(bf, path) __symbol__join_symfs(bf, sizeof(bf), path)
+
extern int vmlinux_path__nr_entries;
extern char **vmlinux_path;
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 66864364ccb4..38af77550c75 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -68,6 +68,7 @@
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <inttypes.h>
+#include <linux/kernel.h>
#include <linux/magic.h>
#include <linux/types.h>
#include <sys/ttydefaults.h>
@@ -317,6 +318,21 @@ unsigned long parse_tag_value(const char *str, struct parse_tag *tags);
#define SRCLINE_UNKNOWN ((char *) "??:0")
+static inline int path__join(char *bf, size_t size,
+ const char *path1, const char *path2)
+{
+ return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
+}
+
+static inline int path__join3(char *bf, size_t size,
+ const char *path1, const char *path2,
+ const char *path3)
+{
+ return scnprintf(bf, size, "%s%s%s%s%s",
+ path1, path1[0] ? "/" : "",
+ path2, path2[0] ? "/" : "", path3);
+}
+
struct dso;
char *get_srcline(struct dso *dso, unsigned long addr);
--
1.8.5.rc2
--
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