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Date: Mon, 22 Mar 2010 18:55:18 GMT
From: tip-bot for Masami Hiramatsu <mhiramat@...hat.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, paulus@...ba.org, acme@...hat.com,
hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
efault@....de, fweisbec@...il.com, tglx@...utronix.de,
mhiramat@...hat.com, mingo@...e.hu
Subject: [tip:perf/core] perf probe: Cleanup debuginfo related code
Commit-ID: 4b4da7f76660ea8b5aa45615165c48f62167ffa8
Gitweb: http://git.kernel.org/tip/4b4da7f76660ea8b5aa45615165c48f62167ffa8
Author: Masami Hiramatsu <mhiramat@...hat.com>
AuthorDate: Mon, 22 Mar 2010 13:10:26 -0300
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 22 Mar 2010 18:47:35 +0100
perf probe: Cleanup debuginfo related code
Cleanup debuginfo related code to eliminate fragile code which
pointed by Ingo (Thanks!).
1) Invert logic of NO_DWARF_SUPPORT to DWARF_SUPPORT.
2) For removing assymetric/local variable ifdefs, introduce
more helper functions.
3) Change options order to reduce the number of ifdefs.
Reported-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <1269274229-20442-2-git-send-email-acme@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
tools/perf/Makefile | 3 +-
tools/perf/builtin-probe.c | 28 ++--
tools/perf/util/probe-event.c | 343 +++++++++++++++++++++-------------------
tools/perf/util/probe-finder.h | 4 +-
4 files changed, 200 insertions(+), 178 deletions(-)
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 0abd25e..c991818 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -506,9 +506,8 @@ endif
ifneq ($(shell sh -c "(echo '\#include <dwarf.h>'; echo '\#include <libdw.h>'; echo 'int main(void) { Dwarf *dbg; dbg = dwarf_begin(0, DWARF_C_READ); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/elfutils -ldw -lelf -o $(BITBUCKET) $(ALL_LDFLAGS) $(EXTLIBS) "$(QUIET_STDERR)" && echo y"), y)
msg := $(warning No libdw.h found or old libdw.h found, disables dwarf support. Please install elfutils-devel/elfutils-dev);
- BASIC_CFLAGS += -DNO_DWARF_SUPPORT
else
- BASIC_CFLAGS += -I/usr/include/elfutils
+ BASIC_CFLAGS += -I/usr/include/elfutils -DDWARF_SUPPORT
EXTLIBS += -lelf -ldw
LIB_OBJS += util/probe-finder.o
endif
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index e0dafd9..cf2ffa5 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -109,7 +109,7 @@ static int opt_del_probe_event(const struct option *opt __used,
return 0;
}
-#ifndef NO_DWARF_SUPPORT
+#ifdef DWARF_SUPPORT
static int opt_show_lines(const struct option *opt __used,
const char *str, int unset __used)
{
@@ -126,7 +126,7 @@ static const char * const probe_usage[] = {
"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
"perf probe [<options>] --del '[GROUP:]EVENT' ...",
"perf probe --list",
-#ifndef NO_DWARF_SUPPORT
+#ifdef DWARF_SUPPORT
"perf probe --line 'LINEDESC'",
#endif
NULL
@@ -135,20 +135,16 @@ static const char * const probe_usage[] = {
static const struct option options[] = {
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show parsed arguments, etc)"),
-#ifndef NO_DWARF_SUPPORT
- OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
- "file", "vmlinux pathname"),
-#endif
OPT_BOOLEAN('l', "list", ¶ms.list_events,
"list up current probe events"),
OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
opt_del_probe_event),
OPT_CALLBACK('a', "add", NULL,
-#ifdef NO_DWARF_SUPPORT
- "[EVENT=]FUNC[+OFF|%return] [ARG ...]",
-#else
+#ifdef DWARF_SUPPORT
"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
" [ARG ...]",
+#else
+ "[EVENT=]FUNC[+OFF|%return] [ARG ...]",
#endif
"probe point definition, where\n"
"\t\tGROUP:\tGroup name (optional)\n"
@@ -156,23 +152,25 @@ static const struct option options[] = {
"\t\tFUNC:\tFunction name\n"
"\t\tOFF:\tOffset from function entry (in byte)\n"
"\t\t%return:\tPut the probe at function return\n"
-#ifdef NO_DWARF_SUPPORT
- "\t\tARG:\tProbe argument (only \n"
-#else
+#ifdef DWARF_SUPPORT
"\t\tSRC:\tSource code path\n"
"\t\tRL:\tRelative line number from function entry.\n"
"\t\tAL:\tAbsolute line number in file.\n"
"\t\tPT:\tLazy expression of line code.\n"
"\t\tARG:\tProbe argument (local variable name or\n"
-#endif
"\t\t\tkprobe-tracer argument format.)\n",
+#else
+ "\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
+#endif
opt_add_probe_event),
OPT_BOOLEAN('f', "force", ¶ms.force_add, "forcibly add events"
" with existing name"),
-#ifndef NO_DWARF_SUPPORT
+#ifdef DWARF_SUPPORT
OPT_CALLBACK('L', "line", NULL,
"FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]",
"Show source code lines.", opt_show_lines),
+ OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
#endif
OPT__DRY_RUN(&probe_event_dry_run),
OPT_END()
@@ -211,7 +209,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
return 0;
}
-#ifndef NO_DWARF_SUPPORT
+#ifdef DWARF_SUPPORT
if (params.show_lines) {
if (params.nevents != 0 || params.dellist) {
pr_warning(" Error: Don't use --line with"
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index c6603f3..3fc0be7 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -42,7 +42,8 @@
#include "color.h"
#include "symbol.h"
#include "thread.h"
-#include "parse-events.h" /* For debugfs_path */
+#include "trace-event.h" /* For __unused */
+#include "parse-events.h" /* For debugfs_path */
#include "probe-event.h"
#include "probe-finder.h"
@@ -70,10 +71,11 @@ static int e_snprintf(char *str, size_t size, const char *format, ...)
return ret;
}
+static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
static struct map_groups kmap_groups;
static struct map *kmaps[MAP__NR_TYPES];
-/* Initialize symbol maps for vmlinux */
+/* Initialize symbol maps and path of vmlinux */
static void init_vmlinux(void)
{
symbol_conf.sort_by_name = true;
@@ -89,7 +91,7 @@ static void init_vmlinux(void)
die("Failed to create kernel maps.");
}
-#ifndef NO_DWARF_SUPPORT
+#ifdef DWARF_SUPPORT
static int open_vmlinux(void)
{
if (map__load(kmaps[MAP__FUNCTION], NULL) < 0) {
@@ -99,6 +101,176 @@ static int open_vmlinux(void)
pr_debug("Try to open %s\n", kmaps[MAP__FUNCTION]->dso->long_name);
return open(kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
}
+
+static void convert_to_perf_probe_point(struct kprobe_trace_point *tp,
+ struct perf_probe_point *pp)
+{
+ struct symbol *sym;
+ int fd, ret = 0;
+
+ sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
+ tp->symbol, NULL);
+ if (sym) {
+ fd = open_vmlinux();
+ ret = find_perf_probe_point(fd, sym->start + tp->offset, pp);
+ close(fd);
+ }
+ if (ret <= 0) {
+ pp->function = xstrdup(tp->symbol);
+ pp->offset = tp->offset;
+ }
+ pp->retprobe = tp->retprobe;
+}
+
+/* Try to find perf_probe_event with debuginfo */
+static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
+ struct kprobe_trace_event **tevs)
+{
+ bool need_dwarf = perf_probe_event_need_dwarf(pev);
+ int fd, ntevs;
+
+ fd = open_vmlinux();
+ if (fd < 0) {
+ if (need_dwarf)
+ die("Could not open debuginfo file.");
+
+ pr_debug("Could not open vmlinux. Try to use symbols.\n");
+ return 0;
+ }
+
+ /* Searching trace events corresponding to probe event */
+ ntevs = find_kprobe_trace_events(fd, pev, tevs);
+ close(fd);
+
+ if (ntevs > 0) /* Succeeded to find trace events */
+ return ntevs;
+
+ if (ntevs == 0) /* No error but failed to find probe point. */
+ die("Probe point '%s' not found. - probe not added.",
+ synthesize_perf_probe_point(&pev->point));
+
+ /* Error path */
+ if (need_dwarf) {
+ if (ntevs == -ENOENT)
+ pr_warning("No dwarf info found in the vmlinux - "
+ "please rebuild with CONFIG_DEBUG_INFO=y.\n");
+ die("Could not analyze debuginfo.");
+ }
+ pr_debug("An error occurred in debuginfo analysis."
+ " Try to use symbols.\n");
+ return 0;
+
+}
+
+#define LINEBUF_SIZE 256
+#define NR_ADDITIONAL_LINES 2
+
+static void show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num)
+{
+ char buf[LINEBUF_SIZE];
+ const char *color = PERF_COLOR_BLUE;
+
+ if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
+ goto error;
+ if (!skip) {
+ if (show_num)
+ fprintf(stdout, "%7u %s", l, buf);
+ else
+ color_fprintf(stdout, color, " %s", buf);
+ }
+
+ while (strlen(buf) == LINEBUF_SIZE - 1 &&
+ buf[LINEBUF_SIZE - 2] != '\n') {
+ if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
+ goto error;
+ if (!skip) {
+ if (show_num)
+ fprintf(stdout, "%s", buf);
+ else
+ color_fprintf(stdout, color, "%s", buf);
+ }
+ }
+ return;
+error:
+ if (feof(fp))
+ die("Source file is shorter than expected.");
+ else
+ die("File read error: %s", strerror(errno));
+}
+
+/*
+ * Show line-range always requires debuginfo to find source file and
+ * line number.
+ */
+void show_line_range(struct line_range *lr)
+{
+ unsigned int l = 1;
+ struct line_node *ln;
+ FILE *fp;
+ int fd, ret;
+
+ /* Search a line range */
+ init_vmlinux();
+ fd = open_vmlinux();
+ if (fd < 0)
+ die("Could not open debuginfo file.");
+ ret = find_line_range(fd, lr);
+ if (ret <= 0)
+ die("Source line is not found.\n");
+ close(fd);
+
+ setup_pager();
+
+ if (lr->function)
+ fprintf(stdout, "<%s:%d>\n", lr->function,
+ lr->start - lr->offset);
+ else
+ fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
+
+ fp = fopen(lr->path, "r");
+ if (fp == NULL)
+ die("Failed to open %s: %s", lr->path, strerror(errno));
+ /* Skip to starting line number */
+ while (l < lr->start)
+ show_one_line(fp, l++, true, false);
+
+ list_for_each_entry(ln, &lr->line_list, list) {
+ while (ln->line > l)
+ show_one_line(fp, (l++) - lr->offset, false, false);
+ show_one_line(fp, (l++) - lr->offset, false, true);
+ }
+
+ if (lr->end == INT_MAX)
+ lr->end = l + NR_ADDITIONAL_LINES;
+ while (l < lr->end && !feof(fp))
+ show_one_line(fp, (l++) - lr->offset, false, false);
+
+ fclose(fp);
+}
+
+#else /* !DWARF_SUPPORT */
+
+static void convert_to_perf_probe_point(struct kprobe_trace_point *tp,
+ struct perf_probe_point *pp)
+{
+ pp->function = xstrdup(tp->symbol);
+ pp->offset = tp->offset;
+ pp->retprobe = tp->retprobe;
+}
+
+static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
+ struct kprobe_trace_event **tevs __unused)
+{
+ if (perf_probe_event_need_dwarf(pev))
+ die("Debuginfo-analysis is not supported");
+ return 0;
+}
+
+void show_line_range(struct line_range *lr __unused)
+{
+ die("Debuginfo-analysis is not supported");
+}
+
#endif
void parse_line_range_desc(const char *arg, struct line_range *lr)
@@ -592,32 +764,14 @@ void convert_to_perf_probe_event(struct kprobe_trace_event *tev,
{
char buf[64];
int i;
-#ifndef NO_DWARF_SUPPORT
- struct symbol *sym;
- int fd, ret = 0;
-
- sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
- tev->point.symbol, NULL);
- if (sym) {
- fd = open_vmlinux();
- ret = find_perf_probe_point(fd, sym->start + tev->point.offset,
- &pev->point);
- close(fd);
- }
- if (ret <= 0) {
- pev->point.function = xstrdup(tev->point.symbol);
- pev->point.offset = tev->point.offset;
- }
-#else
- /* Convert trace_point to probe_point */
- pev->point.function = xstrdup(tev->point.symbol);
- pev->point.offset = tev->point.offset;
-#endif
- pev->point.retprobe = tev->point.retprobe;
+ /* Convert event/group name */
pev->event = xstrdup(tev->event);
pev->group = xstrdup(tev->group);
+ /* Convert trace_point to probe_point */
+ convert_to_perf_probe_point(&tev->point, &pev->point);
+
/* Convert trace_arg to probe_arg */
pev->nargs = tev->nargs;
pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs);
@@ -944,52 +1098,13 @@ static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
struct kprobe_trace_event **tevs)
{
struct symbol *sym;
- bool need_dwarf;
-#ifndef NO_DWARF_SUPPORT
- int fd;
-#endif
int ntevs = 0, i;
struct kprobe_trace_event *tev;
- need_dwarf = perf_probe_event_need_dwarf(pev);
-
- if (need_dwarf)
-#ifdef NO_DWARF_SUPPORT
- die("Debuginfo-analysis is not supported");
-#else /* !NO_DWARF_SUPPORT */
- pr_debug("Some probes require debuginfo.\n");
-
- fd = open_vmlinux();
- if (fd < 0) {
- if (need_dwarf)
- die("Could not open debuginfo file.");
-
- pr_debug("Could not open vmlinux/module file."
- " Try to use symbols.\n");
- goto end_dwarf;
- }
-
- /* Searching probe points */
- ntevs = find_kprobe_trace_events(fd, pev, tevs);
-
- if (ntevs > 0) /* Found */
- goto found;
-
- if (ntevs == 0) /* No error but failed to find probe point. */
- die("Probe point '%s' not found. - probe not added.",
- synthesize_perf_probe_point(&pev->point));
-
- /* Error path */
- if (need_dwarf) {
- if (ntevs == -ENOENT)
- pr_warning("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO=y.\n");
- die("Could not analyze debuginfo.");
- }
- pr_debug("An error occurred in debuginfo analysis."
- " Try to use symbols.\n");
-
-end_dwarf:
-#endif /* !NO_DWARF_SUPPORT */
+ /* Convert perf_probe_event with debuginfo */
+ ntevs = try_to_find_kprobe_trace_events(pev, tevs);
+ if (ntevs > 0)
+ return ntevs;
/* Allocate trace event buffer */
ntevs = 1;
@@ -1012,10 +1127,7 @@ end_dwarf:
if (!sym)
die("Kernel symbol \'%s\' not found - probe not added.",
tev->point.symbol);
-#ifndef NO_DWARF_SUPPORT
-found:
- close(fd);
-#endif
+
return ntevs;
}
@@ -1133,90 +1245,3 @@ void del_perf_probe_events(struct strlist *dellist)
close(fd);
}
-#define LINEBUF_SIZE 256
-#define NR_ADDITIONAL_LINES 2
-
-static void show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num)
-{
- char buf[LINEBUF_SIZE];
- const char *color = PERF_COLOR_BLUE;
-
- if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
- goto error;
- if (!skip) {
- if (show_num)
- fprintf(stdout, "%7u %s", l, buf);
- else
- color_fprintf(stdout, color, " %s", buf);
- }
-
- while (strlen(buf) == LINEBUF_SIZE - 1 &&
- buf[LINEBUF_SIZE - 2] != '\n') {
- if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
- goto error;
- if (!skip) {
- if (show_num)
- fprintf(stdout, "%s", buf);
- else
- color_fprintf(stdout, color, "%s", buf);
- }
- }
- return;
-error:
- if (feof(fp))
- die("Source file is shorter than expected.");
- else
- die("File read error: %s", strerror(errno));
-}
-
-void show_line_range(struct line_range *lr)
-{
- unsigned int l = 1;
- struct line_node *ln;
- FILE *fp;
-#ifndef NO_DWARF_SUPPORT
- int fd, ret;
-#endif
-
- /* Search a line range */
- init_vmlinux();
-#ifndef NO_DWARF_SUPPORT
- fd = open_vmlinux();
- if (fd < 0)
- die("Could not open debuginfo file.");
- ret = find_line_range(fd, lr);
- if (ret <= 0)
- die("Source line is not found.\n");
- close(fd);
-#endif
-
- setup_pager();
-
- if (lr->function)
- fprintf(stdout, "<%s:%d>\n", lr->function,
- lr->start - lr->offset);
- else
- fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
-
- fp = fopen(lr->path, "r");
- if (fp == NULL)
- die("Failed to open %s: %s", lr->path, strerror(errno));
- /* Skip to starting line number */
- while (l < lr->start)
- show_one_line(fp, l++, true, false);
-
- list_for_each_entry(ln, &lr->line_list, list) {
- while (ln->line > l)
- show_one_line(fp, (l++) - lr->offset, false, false);
- show_one_line(fp, (l++) - lr->offset, false, true);
- }
-
- if (lr->end == INT_MAX)
- lr->end = l + NR_ADDITIONAL_LINES;
- while (l < lr->end && !feof(fp))
- show_one_line(fp, (l++) - lr->offset, false, false);
-
- fclose(fp);
-}
-
-
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 2f2307d..3564f22 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -15,7 +15,7 @@ static inline int is_c_varname(const char *name)
return isalpha(name[0]) || name[0] == '_';
}
-#ifndef NO_DWARF_SUPPORT
+#ifdef DWARF_SUPPORT
/* Find kprobe_trace_events specified by perf_probe_event from debuginfo */
extern int find_kprobe_trace_events(int fd, struct perf_probe_event *pev,
struct kprobe_trace_event **tevs);
@@ -57,6 +57,6 @@ struct line_finder {
int found;
};
-#endif /* NO_DWARF_SUPPORT */
+#endif /* DWARF_SUPPORT */
#endif /*_PROBE_FINDER_H */
--
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