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Date: Fri, 11 Dec 2009 14:50:39 -0200
From: Arnaldo Carvalho de Melo <acme@...radead.org>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Frédéric Weisbecker <fweisbec@...il.com>,
Mike Galbraith <efault@....de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>
Subject: [PATCH 4/4] perf symbols: Add support for 'variable' symtabs
From: Arnaldo Carvalho de Melo <acme@...hat.com>
Example:
{
u64 addr = strtoull(sym_filter, NULL, 16);
struct map *map = map_groups__find(kmaps, MAP__VARIABLE, addr);
if (map == NULL)
pr_err("couldn't find map!\n");
else {
struct symbol *sym = map__find_symbol(map, addr, NULL);
if (sym == NULL)
pr_err("couldn't find addr!\n");
else
pr_info("addr %#Lx is in %s global var\n", addr, sym->name);
}
exit(0);
}
Added just after symbol__init() call in 'perf top', then:
{
u64 addr = strtoull(sym_filter, NULL, 16);
struct map *map = map_groups__find(kmaps, MAP__VARIABLE, addr);
if (map == NULL)
pr_err("couldn't find map!\n");
else {
struct symbol *sym = map__find_symbol(map, addr, NULL);
if (sym == NULL)
pr_err("couldn't find addr!\n");
else
pr_info("addr %#Lx is in %s global var\n", addr, sym->name);
}
exit(0);
}
[root@...pio linux-2.6-tip]# grep ' [dD] ' /proc/kallsyms | grep ' sched'
ffffffff817827d8 d sched_nr_latency
ffffffff81782ce0 d sched_domains_mutex
ffffffff8178c070 d schedstr.22423
ffffffff817909a0 d sched_register_mutex
ffffffff81823490 d sched_feat_names
ffffffff81823558 d scheduler_running
ffffffff818235b8 d sched_clock_running
ffffffff818235bc D sched_clock_stable
ffffffff81824f00 d sched_switch_trace
[root@...pio linux-2.6-tip]# perf top -s 0xffffffff817827d9
addr 0xffffffff817827d9 is in sched_nr_latency global var
[root@...pio linux-2.6-tip]# perf top -s ffffffff81782ce0
addr 0xffffffff81782ce0 is in sched_domains_mutex global var
[root@...pio linux-2.6-tip]#
[root@...pio linux-2.6-tip]# perf top -s ffffffff81782ce0 --vmlinux OFF
The file OFF cannot be used, trying to use /proc/kallsyms...addr 0xffffffff81782ce0 is in sched_domains_mutex global var
[root@...pio linux-2.6-tip]# perf top -s ffffffff818235bc --vmlinux OFF
The file OFF cannot be used, trying to use /proc/kallsyms...addr 0xffffffff818235bc is in sched_clock_stable global var
[root@...pio linux-2.6-tip]#
So it works with both /proc/kallsyms and with ELF symtabs, either the one on
the vmlinux explicitely passed via --vmlinux or in one in the vmlinux_path that
matches the buildid for the running kernel or the one found in the buildid
header section in a perf.data file.
Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/util/event.h | 3 +-
tools/perf/util/symbol.c | 66 +++++++++++++++++++++++++++++++++++----------
2 files changed, 53 insertions(+), 16 deletions(-)
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index d9a65d9..5664094 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -103,9 +103,10 @@ void event__print_totals(void);
enum map_type {
MAP__FUNCTION = 0,
+ MAP__VARIABLE,
};
-#define MAP__NR_TYPES (MAP__FUNCTION + 1)
+#define MAP__NR_TYPES (MAP__VARIABLE + 1)
struct map {
union {
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index db8dc97..e63ddb4 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -61,6 +61,8 @@ static bool symbol_type__is_a(char symbol_type, enum map_type map_type)
switch (map_type) {
case MAP__FUNCTION:
return symbol_type == 'T' || symbol_type == 'W';
+ case MAP__VARIABLE:
+ return symbol_type == 'D' || symbol_type == 'd';
default:
return false;
}
@@ -551,6 +553,13 @@ static inline int elf_sym__is_function(const GElf_Sym *sym)
sym->st_shndx != SHN_UNDEF;
}
+static inline bool elf_sym__is_object(const GElf_Sym *sym)
+{
+ return elf_sym__type(sym) == STT_OBJECT &&
+ sym->st_name != 0 &&
+ sym->st_shndx != SHN_UNDEF;
+}
+
static inline int elf_sym__is_label(const GElf_Sym *sym)
{
return elf_sym__type(sym) == STT_NOTYPE &&
@@ -571,6 +580,12 @@ static inline int elf_sec__is_text(const GElf_Shdr *shdr,
return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
}
+static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
+ const Elf_Data *secstrs)
+{
+ return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
+}
+
static inline const char *elf_sym__name(const GElf_Sym *sym,
const Elf_Data *symstrs)
{
@@ -756,6 +771,8 @@ static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
switch (type) {
case MAP__FUNCTION:
return elf_sym__is_function(self);
+ case MAP__VARIABLE:
+ return elf_sym__is_object(self);
default:
return false;
}
@@ -766,6 +783,8 @@ static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type
switch (type) {
case MAP__FUNCTION:
return elf_sec__is_text(self, secstrs);
+ case MAP__VARIABLE:
+ return elf_sec__is_data(self, secstrs);
default:
return false;
}
@@ -1536,42 +1555,59 @@ size_t dsos__fprintf_buildid(FILE *fp)
__dsos__fprintf_buildid(&dsos__user, fp));
}
-static int map_groups__create_kernel_map(struct map_groups *self, const char *vmlinux)
+static struct dso *dsos__create_kernel( const char *vmlinux)
{
- struct map *kmap;
struct dso *kernel = dso__new(vmlinux ?: "[kernel.kallsyms]");
if (kernel == NULL)
- return -1;
-
- kmap = map__new2(0, kernel, MAP__FUNCTION);
- if (kmap == NULL)
- goto out_delete_kernel_dso;
+ return NULL;
- kmap->map_ip = kmap->unmap_ip = identity__map_ip;
kernel->short_name = "[kernel]";
kernel->kernel = 1;
vdso = dso__new("[vdso]");
if (vdso == NULL)
- goto out_delete_kernel_map;
+ goto out_delete_kernel_dso;
dso__set_loaded(vdso, MAP__FUNCTION);
if (sysfs__read_build_id("/sys/kernel/notes", kernel->build_id,
sizeof(kernel->build_id)) == 0)
kernel->has_build_id = true;
- map_groups__insert(self, kmap);
dsos__add(&dsos__kernel, kernel);
dsos__add(&dsos__user, vdso);
- return 0;
+ return kernel;
-out_delete_kernel_map:
- map__delete(kmap);
out_delete_kernel_dso:
dso__delete(kernel);
- return -1;
+ return NULL;
+}
+
+static int map_groups__create_kernel_maps(struct map_groups *self, const char *vmlinux)
+{
+ struct map *functions, *variables;
+ struct dso *kernel = dsos__create_kernel(vmlinux);
+
+ if (kernel == NULL)
+ return -1;
+
+ functions = map__new2(0, kernel, MAP__FUNCTION);
+ if (functions == NULL)
+ return -1;
+
+ variables = map__new2(0, kernel, MAP__VARIABLE);
+ if (variables == NULL) {
+ map__delete(functions);
+ return -1;
+ }
+
+ functions->map_ip = functions->unmap_ip =
+ variables->map_ip = variables->unmap_ip = identity__map_ip;
+ map_groups__insert(self, functions);
+ map_groups__insert(self, variables);
+
+ return 0;
}
static void vmlinux_path__exit(void)
@@ -1640,7 +1676,7 @@ int symbol__init(struct symbol_conf *conf)
if (pconf->try_vmlinux_path && vmlinux_path__init() < 0)
return -1;
- if (map_groups__create_kernel_map(kmaps, pconf->vmlinux_name) < 0) {
+ if (map_groups__create_kernel_maps(kmaps, pconf->vmlinux_name) < 0) {
vmlinux_path__exit();
return -1;
}
--
1.6.2.5
--
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