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Message-ID: <20140129091506.22141.98800.stgit@kbuild-fedora.yrl.intra.hitachi.co.jp>
Date: Wed, 29 Jan 2014 09:15:06 +0000
From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
Oleg Nesterov <oleg@...hat.com>,
Ingo Molnar <mingo@...hat.com>,
"David A. Long" <dave.long@...aro.org>,
yrl.pp-manager.tt@...achi.com, Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH -tip v2 7/8] perf-probe: Show source-level or symbol-level
info for uprobes
Show source-level or symbol-level information for uprobe events.
Without this change;
# ./perf probe -l
probe_perf:dso__load_vmlinux (on 0x000000000006d110 in /kbuild/ksrc/linux-3/tools/perf/perf)
With this change;
# ./perf probe -l
probe_perf:dso__load_vmlinux (on dso__load_vmlinux@...l/symbol.c in /kbuild/ksrc/linux-3/tools/perf/perf)
Changes from v1:
- Rewrite the code based on new series.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
---
tools/perf/util/probe-event.c | 241 ++++++++++++++++++++++++++---------------
1 file changed, 150 insertions(+), 91 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 8db172a..1d6ced1 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -222,38 +222,6 @@ out:
return ret;
}
-static int convert_to_perf_probe_point(struct probe_trace_point *tp,
- struct perf_probe_point *pp)
-{
- struct symbol *sym;
- struct map *map;
- u64 addr;
-
- /* _stext based probe point is solved to absolute address */
- if (tp->symbol && strcmp(tp->symbol, "_stext") == 0) {
- sym = __find_kernel_function_by_name(tp->symbol, &map);
- if (!sym)
- goto failed;
- addr = map->unmap_ip(map, sym->start + tp->offset);
- sym = __find_kernel_function(addr, &map);
- if (!sym)
- goto failed;
- pp->function = strdup(sym->name);
- pp->offset = addr - map->unmap_ip(map, sym->start);
- } else {
-failed:
- pp->function = strdup(tp->symbol);
- pp->offset = tp->offset;
- }
-
- if (pp->function == NULL)
- return -ENOMEM;
-
- pp->retprobe = tp->retprobe;
-
- return 0;
-}
-
#ifdef HAVE_DWARF_SUPPORT
/* Open new debuginfo of given module */
static struct debuginfo *open_debuginfo(const char *module)
@@ -275,48 +243,6 @@ static struct debuginfo *open_debuginfo(const char *module)
return debuginfo__new(path);
}
-/*
- * Convert trace point to probe point with debuginfo
- * Currently only handles kprobes.
- */
-static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
- struct perf_probe_point *pp)
-{
- struct symbol *sym;
- struct map *map;
- u64 addr;
- int ret = -ENOENT;
- struct debuginfo *dinfo;
-
- sym = __find_kernel_function_by_name(tp->symbol, &map);
- if (sym) {
- addr = map->unmap_ip(map, sym->start + tp->offset);
- pr_debug("try to find %s+%ld@%" PRIx64 "\n", tp->symbol,
- tp->offset, addr);
-
- dinfo = debuginfo__new_online_kernel(addr);
- if (!dinfo) /* For kaslr kernel */
- dinfo = open_debuginfo(tp->module);
- if (dinfo) {
- ret = debuginfo__find_probe_point(dinfo,
- (unsigned long)addr, pp);
- debuginfo__delete(dinfo);
- } else {
- pr_debug("Failed to open debuginfo at 0x%" PRIx64 "\n",
- addr);
- ret = -ENOENT;
- }
- }
- if (ret <= 0) {
- pr_debug("Failed to find corresponding probes from "
- "debuginfo. Use kprobe event information.\n");
- return convert_to_perf_probe_point(tp, pp);
- }
- pp->retprobe = tp->retprobe;
-
- return 0;
-}
-
static int get_text_start_address(const char *exec, unsigned long *address)
{
Elf *elf;
@@ -345,6 +271,62 @@ out:
return ret;
}
+/*
+ * Convert trace point to probe point with debuginfo
+ */
+static int find_perf_probe_point_from_dwarf(struct probe_trace_point *tp,
+ struct perf_probe_point *pp,
+ bool is_kprobe)
+{
+ struct symbol *sym;
+ struct map *map;
+ int ret = -ENOENT;
+ struct debuginfo *dinfo = NULL;
+ unsigned long stext = 0;
+ u64 addr = tp->address;
+
+ /* convert the address to dwarf address */
+ if (!is_kprobe) {
+ if (!addr) {
+ ret = -EINVAL;
+ goto error;
+ }
+ ret = get_text_start_address(tp->module, &stext);
+ if (ret < 0)
+ goto error;
+ addr += stext;
+ } else {
+ sym = __find_kernel_function_by_name(tp->symbol, &map);
+ if (!sym)
+ goto error;
+ addr = map->unmap_ip(map, sym->start + tp->offset);
+ }
+
+ pr_debug("try to find information at %" PRIx64 " in %s\n", addr,
+ tp->module ? : "kernel");
+
+ if (is_kprobe)
+ dinfo = debuginfo__new_online_kernel(addr);
+ if (!dinfo) /* For kaslr kernel and uprobes */
+ dinfo = open_debuginfo(tp->module);
+
+ if (dinfo) {
+ ret = debuginfo__find_probe_point(dinfo, (unsigned long)addr, pp);
+ debuginfo__delete(dinfo);
+ } else {
+ pr_debug("Failed to open debuginfo at 0x%" PRIx64 "\n", addr);
+ ret = -ENOENT;
+ }
+
+ if (ret > 0) {
+ pp->retprobe = tp->retprobe;
+ return 0;
+ }
+error:
+ pr_debug("Failed to find corresponding probes from debuginfo.\n");
+ return ret ? : -ENOENT;
+}
+
static int add_exec_to_probe_trace_events(struct probe_trace_event *tevs,
int ntevs, const char *exec)
{
@@ -798,10 +780,12 @@ out:
#else /* !HAVE_DWARF_SUPPORT */
-static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
- struct perf_probe_point *pp)
+static int
+find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
+ struct perf_probe_point *pp __maybe_unused,
+ bool is_kprobe __maybe_unused)
{
- return convert_to_perf_probe_point(tp, pp);
+ return -ENOSYS;
}
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
@@ -1328,16 +1312,21 @@ static int parse_probe_trace_command(const char *cmd,
} else
p = argv[1];
fmt1_str = strtok_r(p, "+", &fmt);
- tp->symbol = strdup(fmt1_str);
- if (tp->symbol == NULL) {
- ret = -ENOMEM;
- goto out;
+ if (fmt1_str[0] == '0') /* only the address started with 0x */
+ tp->address = strtoul(fmt1_str, NULL, 0);
+ else {
+ /* Only the symbol-based probe has offset */
+ tp->symbol = strdup(fmt1_str);
+ if (tp->symbol == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ fmt2_str = strtok_r(NULL, "", &fmt);
+ if (fmt2_str == NULL)
+ tp->offset = 0;
+ else
+ tp->offset = strtoul(fmt2_str, NULL, 10);
}
- fmt2_str = strtok_r(NULL, "", &fmt);
- if (fmt2_str == NULL)
- tp->offset = 0;
- else
- tp->offset = strtoul(fmt2_str, NULL, 10);
tev->nargs = argc - 2;
tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
@@ -1608,6 +1597,80 @@ error:
return NULL;
}
+static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
+ struct perf_probe_point *pp,
+ bool is_kprobe)
+{
+ struct symbol *sym = NULL;
+ struct map *map;
+ u64 addr;
+ int ret = -ENOENT;
+
+ /* _stext based probe point is solved to absolute address */
+ if (tp->symbol && strcmp(tp->symbol, "_stext") == 0) {
+ sym = __find_kernel_function_by_name(tp->symbol, &map);
+ if (!sym)
+ goto out;
+ addr = map->unmap_ip(map, sym->start + tp->offset);
+ sym = __find_kernel_function(addr, &map);
+ } else if (!is_kprobe) {
+ map = dso__new_map(tp->module);
+ if (!map)
+ goto out;
+ addr = tp->address;
+ sym = map__find_symbol(map, addr, NULL);
+ }
+ if (!sym)
+ goto out;
+
+ pp->retprobe = tp->retprobe;
+ pp->offset = addr - map->unmap_ip(map, sym->start);
+ pp->function = strdup(sym->name);
+ ret = pp->function ? 0 : -ENOMEM;
+
+out:
+ if (map && !is_kprobe) {
+ dso__delete(map->dso);
+ map__delete(map);
+ }
+
+ return ret;
+}
+
+static int convert_to_perf_probe_point(struct probe_trace_point *tp,
+ struct perf_probe_point *pp,
+ bool is_kprobe)
+{
+ char buf[128];
+ int ret;
+
+ ret = find_perf_probe_point_from_dwarf(tp, pp, is_kprobe);
+ if (!ret)
+ return 0;
+ ret = find_perf_probe_point_from_map(tp, pp, is_kprobe);
+ if (!ret)
+ return 0;
+
+ pr_debug("Failed to find probe point from both of dwarf and map.\n");
+
+ if (tp->symbol) {
+ pp->function = strdup(tp->symbol);
+ pp->offset = tp->offset;
+ } else if (!tp->module && !is_kprobe) {
+ ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
+ if (ret < 0)
+ return ret;
+ pp->function = strdup(buf);
+ pp->offset = 0;
+ }
+ if (pp->function == NULL)
+ return -ENOMEM;
+
+ pp->retprobe = tp->retprobe;
+
+ return 0;
+}
+
static int convert_to_perf_probe_event(struct probe_trace_event *tev,
struct perf_probe_event *pev, bool is_kprobe)
{
@@ -1621,11 +1684,7 @@ static int convert_to_perf_probe_event(struct probe_trace_event *tev,
return -ENOMEM;
/* Convert trace_point to probe_point */
- if (is_kprobe)
- ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point);
- else
- ret = convert_to_perf_probe_point(&tev->point, &pev->point);
-
+ ret = convert_to_perf_probe_point(&tev->point, &pev->point, is_kprobe);
if (ret < 0)
return ret;
--
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