[PATCH 2/4] perf symbols: Symplify symbol machinery setup
From: Arnaldo Carvalho de Melo
Date: Tue Nov 24 2009 - 09:06:04 EST
From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
And also express its configuration toggles via a struct.
Now all one has to do is to call symbol__init(NULL) if the defaults are
OK, or pass a struct symbol_conf pointer with the desired configuration.
If a tool uses kernel_maps__find_symbol to look on the kernel and
modules mappings for a symbol but didn't call symbol__init first, that
will generate a one time warning too, alerting the subcommand developer
that symbol__init() must be called.
Cc: FrÃdÃric Weisbecker <fweisbec@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-annotate.c | 20 ++++++++++----------
tools/perf/builtin-kmem.c | 2 +-
tools/perf/builtin-report.c | 15 ++++++++-------
tools/perf/builtin-sched.c | 2 +-
tools/perf/builtin-top.c | 24 +++++++++++++-----------
tools/perf/builtin-trace.c | 2 +-
tools/perf/util/data_map.c | 8 --------
tools/perf/util/data_map.h | 2 --
tools/perf/util/header.c | 6 ------
tools/perf/util/include/asm/bug.h | 22 ++++++++++++++++++++++
tools/perf/util/symbol.c | 31 +++++++++++++++++++++----------
tools/perf/util/symbol.h | 11 ++++++++---
12 files changed, 85 insertions(+), 60 deletions(-)
create mode 100644 tools/perf/util/include/asm/bug.h
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index 6b13a1e..45069a4 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -33,11 +33,9 @@ static int input;
static int full_paths;
static int print_line;
-static bool use_modules;
static unsigned long page_size;
static unsigned long mmap_window = 32;
-const char *vmlinux_name;
struct sym_hist {
u64 sum;
@@ -55,6 +53,11 @@ struct sym_priv {
struct sym_ext *ext;
};
+static struct symbol_conf symbol_conf = {
+ .priv_size = sizeof(struct sym_priv),
+ .try_vmlinux_path = true,
+};
+
static const char *sym_hist_filter;
static int symbol_filter(struct map *map __used, struct symbol *sym)
@@ -638,11 +641,6 @@ static int __cmd_annotate(void)
exit(0);
}
- if (kernel_maps__init(vmlinux_name, true, use_modules) < 0) {
- pr_err("failed to create kernel maps for symbol resolution\b");
- return -1;
- }
-
remap:
buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
MAP_SHARED, input, offset);
@@ -743,8 +741,9 @@ static const struct option options[] = {
"be more verbose (show symbol address, etc)"),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
- OPT_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
- OPT_BOOLEAN('m', "modules", &use_modules,
+ OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
+ OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
"load module symbols - WARNING: use only with -k and LIVE kernel"),
OPT_BOOLEAN('l', "print-line", &print_line,
"print matching source lines (may be slow)"),
@@ -770,7 +769,8 @@ static void setup_sorting(void)
int cmd_annotate(int argc, const char **argv, const char *prefix __used)
{
- symbol__init(sizeof(struct sym_priv));
+ if (symbol__init(&symbol_conf) < 0)
+ return -1;
page_size = getpagesize();
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 256d18f..38b01a9 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -291,7 +291,7 @@ static int read_events(void)
register_idle_thread();
register_perf_file_handler(&file_handler);
- return mmap_dispatch_perf_file(&header, input_name, NULL, false, 0, 0,
+ return mmap_dispatch_perf_file(&header, input_name, 0, 0,
&cwdlen, &cwd);
}
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index fe474b7..b16f86d 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -38,7 +38,6 @@ static char *dso_list_str, *comm_list_str, *sym_list_str,
static struct strlist *dso_list, *comm_list, *sym_list;
static int force;
-static bool use_modules;
static int full_paths;
static int show_nr_samples;
@@ -52,7 +51,6 @@ static char *pretty_printing_style = default_pretty_printing_style;
static int exclude_other = 1;
static char callchain_default_opt[] = "fractal,0.5";
-const char *vmlinux_name;
static char *cwd;
static int cwdlen;
@@ -61,6 +59,8 @@ static struct perf_header *header;
static u64 sample_type;
+struct symbol_conf symbol_conf;
+
static size_t
callchain__fprintf_left_margin(FILE *fp, int left_margin)
@@ -926,8 +926,7 @@ static int __cmd_report(void)
register_perf_file_handler(&file_handler);
- ret = mmap_dispatch_perf_file(&header, input_name, vmlinux_name,
- !vmlinux_name, force,
+ ret = mmap_dispatch_perf_file(&header, input_name, force,
full_paths, &cwdlen, &cwd);
if (ret)
return ret;
@@ -1024,9 +1023,10 @@ static const struct option options[] = {
"be more verbose (show symbol address, etc)"),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
- OPT_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
+ OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
- OPT_BOOLEAN('m', "modules", &use_modules,
+ OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
"load module symbols - WARNING: use only with -k and LIVE kernel"),
OPT_BOOLEAN('n', "show-nr-samples", &show_nr_samples,
"Show a column with the number of samples"),
@@ -1096,7 +1096,8 @@ static void setup_list(struct strlist **list, const char *list_str,
int cmd_report(int argc, const char **argv, const char *prefix __used)
{
- symbol__init(0);
+ if (symbol__init(&symbol_conf) < 0)
+ return -1;
argc = parse_options(argc, argv, options, report_usage, 0);
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 260f57a..dbf089b 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1718,7 +1718,7 @@ static int read_events(void)
register_idle_thread();
register_perf_file_handler(&file_handler);
- return mmap_dispatch_perf_file(&header, input_name, NULL, false, 0, 0,
+ return mmap_dispatch_perf_file(&header, input_name, 0, 0,
&cwdlen, &cwd);
}
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index b9a321f..a212475 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -79,7 +79,7 @@ static int dump_symtab = 0;
static bool hide_kernel_symbols = false;
static bool hide_user_symbols = false;
static struct winsize winsize;
-const char *vmlinux_name;
+struct symbol_conf symbol_conf;
/*
* Source
@@ -128,7 +128,7 @@ struct sym_entry {
static inline struct symbol *sym_entry__symbol(struct sym_entry *self)
{
- return ((void *)self) + symbol__priv_size;
+ return ((void *)self) + symbol_conf.priv_size;
}
static void get_term_dimensions(struct winsize *ws)
@@ -695,7 +695,7 @@ static void print_mapped_keys(void)
fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);
- if (vmlinux_name) {
+ if (symbol_conf.vmlinux_name) {
fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
fprintf(stdout, "\t[S] stop annotation.\n");
@@ -732,7 +732,7 @@ static int key_mapped(int c)
case 'F':
case 's':
case 'S':
- return vmlinux_name ? 1 : 0;
+ return symbol_conf.vmlinux_name ? 1 : 0;
default:
break;
}
@@ -1261,7 +1261,8 @@ static const struct option options[] = {
"system-wide collection from all CPUs"),
OPT_INTEGER('C', "CPU", &profile_cpu,
"CPU to profile on"),
- OPT_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
+ OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
OPT_BOOLEAN('K', "hide_kernel_symbols", &hide_kernel_symbols,
"hide kernel symbols"),
OPT_INTEGER('m', "mmap-pages", &mmap_pages,
@@ -1295,7 +1296,7 @@ static const struct option options[] = {
int cmd_top(int argc, const char **argv, const char *prefix __used)
{
- int counter, err;
+ int counter;
page_size = sysconf(_SC_PAGE_SIZE);
@@ -1313,15 +1314,16 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
if (!nr_counters)
nr_counters = 1;
- symbol__init(sizeof(struct sym_entry) +
- (nr_counters + 1) * sizeof(unsigned long));
+ symbol_conf.priv_size = (sizeof(struct sym_entry) +
+ (nr_counters + 1) * sizeof(unsigned long));
+ if (symbol_conf.vmlinux_name == NULL)
+ symbol_conf.try_vmlinux_path = true;
+ if (symbol__init(&symbol_conf) < 0)
+ return -1;
if (delay_secs < 1)
delay_secs = 1;
- err = kernel_maps__init(vmlinux_name, !vmlinux_name, true);
- if (err < 0)
- return err;
parse_source(sym_filter_entry);
/*
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index b71198e..75972fd 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -131,7 +131,7 @@ static int __cmd_trace(void)
register_idle_thread();
register_perf_file_handler(&file_handler);
- return mmap_dispatch_perf_file(&header, input_name, NULL, false,
+ return mmap_dispatch_perf_file(&header, input_name,
0, 0, &cwdlen, &cwd);
}
diff --git a/tools/perf/util/data_map.c b/tools/perf/util/data_map.c
index f318d19..b238462 100644
--- a/tools/perf/util/data_map.c
+++ b/tools/perf/util/data_map.c
@@ -101,8 +101,6 @@ out:
int mmap_dispatch_perf_file(struct perf_header **pheader,
const char *input_name,
- const char *vmlinux_name,
- bool try_vmlinux_path,
int force,
int full_paths,
int *cwdlen,
@@ -172,12 +170,6 @@ int mmap_dispatch_perf_file(struct perf_header **pheader,
curr_handler->sample_type_check(sample_type) < 0)
goto out_delete;
- err = -ENOMEM;
- if (kernel_maps__init(vmlinux_name, try_vmlinux_path, true) < 0) {
- pr_err("failed to setup the kernel maps to resolve symbols\n");
- goto out_delete;
- }
-
if (!full_paths) {
if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
pr_err("failed to get the current directory\n");
diff --git a/tools/perf/util/data_map.h b/tools/perf/util/data_map.h
index 3f0d21b..ae036ec 100644
--- a/tools/perf/util/data_map.h
+++ b/tools/perf/util/data_map.h
@@ -23,8 +23,6 @@ struct perf_file_handler {
void register_perf_file_handler(struct perf_file_handler *handler);
int mmap_dispatch_perf_file(struct perf_header **pheader,
const char *input_name,
- const char *vmlinux_name,
- bool try_vmlinux_path,
int force,
int full_paths,
int *cwdlen,
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 1332f8e..271a160 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -253,12 +253,6 @@ static int perf_header__adds_write(struct perf_header *self, int fd)
buildid_sec = &feat_sec[idx++];
- /*
- * Read the kernel buildid nad the list of loaded modules with
- * its build_ids:
- */
- kernel_maps__init(NULL, false, true);
-
/* Write build-ids */
buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
err = dsos__write_buildid_table(fd);
diff --git a/tools/perf/util/include/asm/bug.h b/tools/perf/util/include/asm/bug.h
new file mode 100644
index 0000000..7fcc681
--- /dev/null
+++ b/tools/perf/util/include/asm/bug.h
@@ -0,0 +1,22 @@
+#ifndef _PERF_ASM_GENERIC_BUG_H
+#define _PERF_ASM_GENERIC_BUG_H
+
+#define __WARN_printf(arg...) do { fprintf(stderr, arg); } while (0)
+
+#define WARN(condition, format...) ({ \
+ int __ret_warn_on = !!(condition); \
+ if (unlikely(__ret_warn_on)) \
+ __WARN_printf(format); \
+ unlikely(__ret_warn_on); \
+})
+
+#define WARN_ONCE(condition, format...) ({ \
+ static int __warned; \
+ int __ret_warn_once = !!(condition); \
+ \
+ if (unlikely(__ret_warn_once)) \
+ if (WARN(!__warned, format)) \
+ __warned = 1; \
+ unlikely(__ret_warn_once); \
+})
+#endif
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 44d81d5..c4ca974 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -6,6 +6,7 @@
#include "debug.h"
+#include <asm/bug.h>
#include <libelf.h>
#include <gelf.h>
#include <elf.h>
@@ -37,6 +38,11 @@ unsigned int symbol__priv_size;
static int vmlinux_path__nr_entries;
static char **vmlinux_path;
+static struct symbol_conf symbol_conf__defaults = {
+ .use_modules = true,
+ .try_vmlinux_path = true,
+};
+
static struct rb_root kernel_maps;
static void dso__fixup_sym_end(struct dso *self)
@@ -1166,7 +1172,9 @@ struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp,
if (map) {
ip = map->map_ip(map, ip);
return map__find_symbol(map, ip, filter);
- }
+ } else
+ WARN_ONCE(RB_EMPTY_ROOT(&kernel_maps),
+ "Empty kernel_maps, was symbol__init() called?\n");
return NULL;
}
@@ -1485,9 +1493,9 @@ size_t dsos__fprintf_buildid(FILE *fp)
return ret;
}
-static int kernel_maps__create_kernel_map(const char *vmlinux_name)
+static int kernel_maps__create_kernel_map(const struct symbol_conf *conf)
{
- struct dso *kernel = dso__new(vmlinux_name ?: "[kernel.kallsyms]");
+ struct dso *kernel = dso__new(conf->vmlinux_name ?: "[kernel.kallsyms]");
if (kernel == NULL)
return -1;
@@ -1577,18 +1585,21 @@ out_fail:
return -1;
}
-int kernel_maps__init(const char *vmlinux_name, bool try_vmlinux_path,
- bool use_modules)
+static int kernel_maps__init(const struct symbol_conf *conf)
{
- if (try_vmlinux_path && vmlinux_path__init() < 0)
+ const struct symbol_conf *pconf = conf ?: &symbol_conf__defaults;
+
+ symbol__priv_size = pconf->priv_size;
+
+ if (pconf->try_vmlinux_path && vmlinux_path__init() < 0)
return -1;
- if (kernel_maps__create_kernel_map(vmlinux_name) < 0) {
+ if (kernel_maps__create_kernel_map(pconf) < 0) {
vmlinux_path__exit();
return -1;
}
- if (use_modules && kernel_maps__create_module_maps() < 0)
+ if (pconf->use_modules && kernel_maps__create_module_maps() < 0)
pr_debug("Failed to load list of modules in use, "
"continuing...\n");
/*
@@ -1598,8 +1609,8 @@ int kernel_maps__init(const char *vmlinux_name, bool try_vmlinux_path,
return 0;
}
-void symbol__init(unsigned int priv_size)
+int symbol__init(struct symbol_conf *conf)
{
elf_version(EV_CURRENT);
- symbol__priv_size = priv_size;
+ return kernel_maps__init(conf);
}
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 8c4d026..5538691 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -49,6 +49,13 @@ struct symbol {
char name[0];
};
+struct symbol_conf {
+ unsigned short priv_size;
+ bool try_vmlinux_path,
+ use_modules;
+ const char *vmlinux_name;
+};
+
extern unsigned int symbol__priv_size;
static inline void *symbol__priv(struct symbol *self)
@@ -93,11 +100,9 @@ int sysfs__read_build_id(const char *filename, void *bf, size_t size);
bool dsos__read_build_ids(void);
int build_id__sprintf(u8 *self, int len, char *bf);
-int kernel_maps__init(const char *vmlinux_name, bool try_vmlinux_path,
- bool use_modules);
size_t kernel_maps__fprintf(FILE *fp);
-void symbol__init(unsigned int priv_size);
+int symbol__init(struct symbol_conf *conf);
extern struct list_head dsos;
extern struct map *kernel_map;
--
1.6.2.5
--
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