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Subject[PATCH] perf, tools: Support srccode output
Date
From: Andi Kleen <ak@linux.intel.com>

When looking at PT or brstackinsn traces with perf script
it can be very useful to see the source code. This adds a simple
facility to print them with perf script, if the information
is available through dwarf

% perf record ...
% perf script -F insn,ip,sym,srccode
...

4004c6 main
5 for (i = 0; i < 10000000; i++)
4004cd main
5 for (i = 0; i < 10000000; i++)
4004c6 main
5 for (i = 0; i < 10000000; i++)
4004cd main
5 for (i = 0; i < 10000000; i++)
4004cd main
5 for (i = 0; i < 10000000; i++)
4004cd main
5 for (i = 0; i < 10000000; i++)
4004cd main
5 for (i = 0; i < 10000000; i++)
4004cd main
5 for (i = 0; i < 10000000; i++)
4004b3 main
6 v++;

% perf record -b ...
% perf script -F insn,ip,sym,srccode,brstackinsn

...
main+22:
0000000000400543 insn: e8 ca ff ff ff # PRED
|18 f1();
f1:
0000000000400512 insn: 55
|10 {
0000000000400513 insn: 48 89 e5
0000000000400516 insn: b8 00 00 00 00
|11 f2();
000000000040051b insn: e8 d6 ff ff ff # PRED
f2:
00000000004004f6 insn: 55
|5 {
00000000004004f7 insn: 48 89 e5
00000000004004fa insn: 8b 05 2c 0b 20 00
|6 c = a / b;
0000000000400500 insn: 8b 0d 2a 0b 20 00
0000000000400506 insn: 99
0000000000400507 insn: f7 f9
0000000000400509 insn: 89 05 29 0b 20 00
000000000040050f insn: 90
|7 }
0000000000400510 insn: 5d
0000000000400511 insn: c3 # PRED
f1+14:
0000000000400520 insn: b8 00 00 00 00
|12 f2();
0000000000400525 insn: e8 cc ff ff ff # PRED
f2:
00000000004004f6 insn: 55
|5 {
00000000004004f7 insn: 48 89 e5
00000000004004fa insn: 8b 05 2c 0b 20 00
|6 c = a / b;

Not supported for callchains currently, would need some
layout changes there.

v2:
Limit number of cached source files
Delete bogus comment.
Directly use the line number / file from the bfd lookup code
Add prefix to source to make it easier to handle for scripts
Avoid redundant listing of lines
Fix include guard in srccode.h
Use a hash table for the source lookup.

v3:
Remove prefix. Remove unwind_inlines.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
tools/perf/Documentation/perf-script.txt | 3 +-
tools/perf/builtin-script.c | 40 ++++++-
tools/perf/util/Build | 1 +
tools/perf/util/evsel_fprintf.c | 1 +
tools/perf/util/map.c | 49 ++++++++
tools/perf/util/map.h | 16 +++
tools/perf/util/srccode.c | 186 +++++++++++++++++++++++++++++++
tools/perf/util/srccode.h | 7 ++
tools/perf/util/srcline.c | 28 +++++
tools/perf/util/srcline.h | 1 +
tools/perf/util/thread.c | 2 +
tools/perf/util/thread.h | 2 +
12 files changed, 334 insertions(+), 2 deletions(-)
create mode 100644 tools/perf/util/srccode.c
create mode 100644 tools/perf/util/srccode.h

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index cb0eda3925e6..a8fdc798e259 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -117,7 +117,8 @@ OPTIONS
Comma separated list of fields to print. Options are:
comm, tid, pid, time, cpu, event, trace, ip, sym, dso, addr, symoff,
srcline, period, iregs, brstack, brstacksym, flags, bpf-output, brstackinsn,
- callindent, insn, insnlen. Field list can be prepended with the type, trace, sw or hw,
+ callindent, insn, insnlen, srccode.
+ Field list can be prepended with the type, trace, sw or hw,
to indicate to which event type the field list applies.
e.g., -F sw:comm,tid,time,ip,sym and -F trace:time,cpu,trace

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index d05aec491cff..2094fd0a9f7c 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -85,6 +85,7 @@ enum perf_output_field {
PERF_OUTPUT_INSN = 1U << 21,
PERF_OUTPUT_INSNLEN = 1U << 22,
PERF_OUTPUT_BRSTACKINSN = 1U << 23,
+ PERF_OUTPUT_SRCCODE = 1U << 24,
};

struct output_option {
@@ -115,6 +116,7 @@ struct output_option {
{.str = "insn", .field = PERF_OUTPUT_INSN},
{.str = "insnlen", .field = PERF_OUTPUT_INSNLEN},
{.str = "brstackinsn", .field = PERF_OUTPUT_BRSTACKINSN},
+ {.str = "srccode", .field = PERF_OUTPUT_SRCCODE},
};

/* default set to maintain compatibility with current format */
@@ -304,7 +306,7 @@ static int perf_evsel__check_attr(struct perf_evsel *evsel,
"to DSO.\n");
return -EINVAL;
}
- if (PRINT_FIELD(SRCLINE) && !PRINT_FIELD(IP)) {
+ if ((PRINT_FIELD(SRCLINE) || PRINT_FIELD(SRCCODE)) && !PRINT_FIELD(IP)) {
pr_err("Display of source line number requested but sample IP is not\n"
"selected. Hence, no address to lookup the source line number.\n");
return -EINVAL;
@@ -633,6 +635,20 @@ static int grab_bb(u8 *buffer, u64 start, u64 end,
return len;
}

+static void print_srccode(struct thread *thread, u8 cpumode, uint64_t addr)
+{
+ struct addr_location al;
+ memset(&al, 0, sizeof(al));
+
+ thread__find_addr_map(thread, cpumode, MAP__FUNCTION, addr, &al);
+ if (!al.map)
+ thread__find_addr_map(thread, cpumode, MAP__VARIABLE,
+ addr, &al);
+ if (al.map && map__fprintf_srccode(al.map, al.addr, stdout,
+ &thread->srccode_state))
+ printf("\n");
+}
+
static void print_jump(uint64_t ip, struct branch_entry *en,
struct perf_insn *x, u8 *inbuf, int len,
int insn)
@@ -723,6 +739,8 @@ static void print_sample_brstackinsn(struct perf_sample *sample,
br->entries[nr - 1].from, &lastsym, attr);
print_jump(br->entries[nr - 1].from, &br->entries[nr - 1],
&x, buffer, len, 0);
+ if (PRINT_FIELD(SRCCODE))
+ print_srccode(thread, x.cpumode, br->entries[nr - 1].from);
}

/* Print all blocks */
@@ -751,12 +769,16 @@ static void print_sample_brstackinsn(struct perf_sample *sample,
print_ip_sym(thread, x.cpumode, x.cpu, ip, &lastsym, attr);
if (ip == end) {
print_jump(ip, &br->entries[i], &x, buffer + off, len - off, insn);
+ if (PRINT_FIELD(SRCCODE))
+ print_srccode(thread, x.cpumode, ip);
break;
} else {
printf("\t%016" PRIx64 "\t%s\n", ip,
dump_insn(&x, ip, buffer + off, len - off, &ilen));
if (ilen == 0)
break;
+ if (PRINT_FIELD(SRCCODE))
+ print_srccode(thread, x.cpumode, ip);
insn++;
}
}
@@ -787,6 +809,8 @@ static void print_sample_brstackinsn(struct perf_sample *sample,

printf("\t%016" PRIx64 "\t%s\n", sample->ip,
dump_insn(&x, sample->ip, buffer, len, NULL));
+ if (PRINT_FIELD(SRCCODE))
+ print_srccode(thread, x.cpumode, sample->ip);
return;
}
for (off = 0; off <= end - start; off += ilen) {
@@ -794,6 +818,8 @@ static void print_sample_brstackinsn(struct perf_sample *sample,
dump_insn(&x, start + off, buffer + off, len - off, &ilen));
if (ilen == 0)
break;
+ if (PRINT_FIELD(SRCCODE))
+ print_srccode(thread, x.cpumode, start + off);
}
}

@@ -947,6 +973,12 @@ static void print_sample_bts(struct perf_sample *sample,
print_insn(sample, attr, thread, machine);

printf("\n");
+
+ if (PRINT_FIELD(SRCCODE)) {
+ if (map__fprintf_srccode(al->map, al->addr, stdout,
+ &thread->srccode_state))
+ printf("\n");
+ }
}

static struct {
@@ -1195,6 +1227,12 @@ static void process_event(struct perf_script *script,
print_sample_bpf_output(sample);
print_insn(sample, attr, thread, machine);
printf("\n");
+
+ if (PRINT_FIELD(SRCCODE)) {
+ if (map__fprintf_srccode(al->map, al->addr, stdout,
+ &thread->srccode_state))
+ printf("\n");
+ }
}

static struct scripting_ops *scripting_ops;
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 069583bdc670..c8b171a464ef 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -72,6 +72,7 @@ libperf-y += stat.o
libperf-y += stat-shadow.o
libperf-y += record.o
libperf-y += srcline.o
+libperf-y += srccode.o
libperf-y += data.o
libperf-y += tsc.o
libperf-y += cloexec.o
diff --git a/tools/perf/util/evsel_fprintf.c b/tools/perf/util/evsel_fprintf.c
index e415aee6a245..e9bcd90c9cb5 100644
--- a/tools/perf/util/evsel_fprintf.c
+++ b/tools/perf/util/evsel_fprintf.c
@@ -168,6 +168,7 @@ int sample__fprintf_callchain(struct perf_sample *sample, int left_alignment,
if (!print_oneline)
printed += fprintf(fp, "\n");

+ /* Add srccode here too? */
if (symbol_conf.bt_stop_list &&
node->sym &&
strlist__has_entry(symbol_conf.bt_stop_list,
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index ebfa5d92358a..4a7419f8a49e 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -17,6 +17,7 @@
#include <linux/string.h>
#include "srcline.h"
#include "unwind.h"
+#include "srccode.h"

static void __maps__insert(struct maps *maps, struct map *map);

@@ -414,6 +415,54 @@ int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
return ret;
}

+int map__fprintf_srccode(struct map *map, u64 addr,
+ FILE *fp,
+ struct srccode_state *state)
+{
+ char *srcfile;
+ int ret = 0;
+ unsigned line;
+ int len;
+ char *srccode;
+
+ if (!map || !map->dso)
+ return 0;
+ srcfile = get_srcline_split(map->dso,
+ map__rip_2objdump(map, addr),
+ &line);
+ if (!srcfile)
+ return 0;
+
+ /* Avoid redundant printing */
+ if (state &&
+ state->srcfile &&
+ !strcmp(state->srcfile, srcfile) &&
+ state->line == line) {
+ free(srcfile);
+ return 0;
+ }
+
+ srccode = find_sourceline(srcfile, line, &len);
+ if (!srccode)
+ goto out_free_line;
+
+ ret = fprintf(fp, "|%-8d %.*s", line, len, srccode);
+ state->srcfile = srcfile;
+ state->line = line;
+ return ret;
+
+out_free_line:
+ free(srcfile);
+ return ret;
+}
+
+
+void srccode_state_free(struct srccode_state *state)
+{
+ zfree(&state->srcfile);
+ state->line = 0;
+}
+
/**
* map__rip_2objdump - convert symbol start address to objdump address.
* @map: memory map
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index c8a5a644c0a9..3506acf8810e 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -170,6 +170,22 @@ size_t map__fprintf_dsoname(struct map *map, FILE *fp);
int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
FILE *fp);

+struct srccode_state {
+ char *srcfile;
+ unsigned line;
+};
+
+static inline void srccode_state_init(struct srccode_state *state)
+{
+ state->srcfile = NULL;
+ state->line = 0;
+}
+
+void srccode_state_free(struct srccode_state *state);
+
+int map__fprintf_srccode(struct map *map, u64 addr,
+ FILE *fp, struct srccode_state *state);
+
int map__load(struct map *map);
struct symbol *map__find_symbol(struct map *map, u64 addr);
struct symbol *map__find_symbol_by_name(struct map *map, const char *name);
diff --git a/tools/perf/util/srccode.c b/tools/perf/util/srccode.c
new file mode 100644
index 000000000000..c22f6a3aa6ba
--- /dev/null
+++ b/tools/perf/util/srccode.c
@@ -0,0 +1,186 @@
+/*
+ * Manage printing of source lines
+ * Copyright (c) 2017, Intel Corporation.
+ * Author: Andi Kleen
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#include "linux/list.h"
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+#include <unistd.h>
+#include <assert.h>
+#include <string.h>
+#include "srccode.h"
+#include "debug.h"
+#include "util.h"
+
+#define MAXSRCCACHE (32*1024*1024)
+#define MAXSRCFILES 64
+#define SRC_HTAB_SZ 64
+
+struct srcfile {
+ struct hlist_node hash_nd;
+ struct list_head nd;
+ char *fn;
+ char **lines;
+ char *map;
+ unsigned numlines;
+ size_t maplen;
+};
+
+static struct hlist_head srcfile_htab[SRC_HTAB_SZ];
+static LIST_HEAD(srcfile_list);
+static long map_total_sz;
+static int num_srcfiles;
+
+static unsigned shash(unsigned char *s)
+{
+ unsigned h = 0;
+ while (*s)
+ h = 65599 * h + *s++;
+ return h ^ (h >> 16);
+}
+
+static int countlines(char *map, int maplen)
+{
+ int numl;
+ char *end = map + maplen;
+ char *p = map;
+
+ if (maplen == 0)
+ return 0;
+ numl = 0;
+ while (p < end && (p = memchr(p, '\n', end - p)) != NULL) {
+ numl++;
+ p++;
+ }
+ if (p < end)
+ numl++;
+ return numl;
+}
+
+static void fill_lines(char **lines, int maxline, char *map, int maplen)
+{
+ int l;
+ char *end = map + maplen;
+ char *p = map;
+
+ if (maplen == 0 || maxline == 0)
+ return;
+ l = 0;
+ lines[l++] = map;
+ while (p < end && (p = memchr(p, '\n', end - p)) != NULL) {
+ if (l >= maxline)
+ return;
+ lines[l++] = ++p;
+ }
+ if (p < end)
+ lines[l] = p;
+}
+
+static void free_srcfile(struct srcfile *sf)
+{
+ list_del(&sf->nd);
+ hlist_del(&sf->hash_nd);
+ map_total_sz -= sf->maplen;
+ munmap(sf->map, sf->maplen);
+ free(sf->lines);
+ free(sf->fn);
+ free(sf);
+ num_srcfiles--;
+}
+
+static struct srcfile *find_srcfile(char *fn)
+{
+ struct stat st;
+ struct srcfile *h;
+ int fd;
+ unsigned long sz;
+ unsigned hval = shash((unsigned char *)fn) % SRC_HTAB_SZ;
+
+ hlist_for_each_entry (h, &srcfile_htab[hval], hash_nd) {
+ if (!strcmp(fn, h->fn)) {
+ /* Move to front */
+ list_del(&h->nd);
+ list_add(&h->nd, &srcfile_list);
+ return h;
+ }
+ }
+
+ /* Only prune if there is more than one entry */
+ while ((num_srcfiles > MAXSRCFILES || map_total_sz > MAXSRCCACHE) &&
+ srcfile_list.next != &srcfile_list) {
+ assert(!list_empty(&srcfile_list));
+ h = list_entry(srcfile_list.prev, struct srcfile, nd);
+ free_srcfile(h);
+ }
+
+ fd = open(fn, O_RDONLY);
+ if (fd < 0 || fstat(fd, &st) < 0) {
+ pr_debug("cannot open source file %s\n", fn);
+ return NULL;
+ }
+
+ h = malloc(sizeof(struct srcfile));
+ if (!h)
+ return NULL;
+
+ h->fn = strdup(fn);
+ if (!h->fn)
+ goto out_h;
+
+ h->maplen = st.st_size;
+ sz = (h->maplen + page_size - 1) & ~(page_size - 1);
+ h->map = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
+ close(fd);
+ if (h->map == (char *)-1) {
+ pr_debug("cannot mmap source file %s\n", fn);
+ goto out_fn;
+ }
+ h->numlines = countlines(h->map, h->maplen);
+ h->lines = calloc(h->numlines, sizeof(char *));
+ if (!h->lines)
+ goto out_map;
+ fill_lines(h->lines, h->numlines, h->map, h->maplen);
+ list_add(&h->nd, &srcfile_list);
+ hlist_add_head(&h->hash_nd, &srcfile_htab[hval]);
+ map_total_sz += h->maplen;
+ num_srcfiles++;
+ return h;
+
+out_map:
+ munmap(h->map, sz);
+out_fn:
+ free(h->fn);
+out_h:
+ free(h);
+ return NULL;
+}
+
+/* Result is not 0 terminated */
+char *find_sourceline(char *fn, unsigned line, int *lenp)
+{
+ char *l, *p;
+ struct srcfile *sf = find_srcfile(fn);
+ if (!sf)
+ return NULL;
+ line--;
+ if (line >= sf->numlines)
+ return NULL;
+ l = sf->lines[line];
+ if (!l)
+ return NULL;
+ p = memchr(l, '\n', sf->map + sf->maplen - l);
+ *lenp = p - l;
+ return l;
+}
diff --git a/tools/perf/util/srccode.h b/tools/perf/util/srccode.h
new file mode 100644
index 000000000000..e500a746d5f1
--- /dev/null
+++ b/tools/perf/util/srccode.h
@@ -0,0 +1,7 @@
+#ifndef SRCCODE_H
+#define SRCCODE_H 1
+
+/* Result is not 0 terminated */
+char *find_sourceline(char *fn, unsigned line, int *lenp);
+
+#endif
diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
index df051a52393c..77a76bb7d121 100644
--- a/tools/perf/util/srcline.c
+++ b/tools/perf/util/srcline.c
@@ -479,6 +479,34 @@ char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
return srcline;
}

+/* Returns filename and fills in line number in line */
+char *get_srcline_split(struct dso *dso, u64 addr, unsigned *line)
+{
+ char *file = NULL;
+ const char *dso_name;
+
+ if (!dso->has_srcline)
+ goto out;
+
+ dso_name = dso__name(dso);
+ if (dso_name == NULL)
+ goto out;
+
+ if (!addr2line(dso_name, addr, &file, line, dso, true, NULL))
+ goto out;
+
+ dso->a2l_fails = 0;
+ return file;
+
+out:
+ if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
+ dso->has_srcline = 0;
+ dso__free_a2l(dso);
+ }
+
+ return NULL;
+}
+
void free_srcline(char *srcline)
{
if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0)
diff --git a/tools/perf/util/srcline.h b/tools/perf/util/srcline.h
index 7b52ba88676e..b518ff3f82ca 100644
--- a/tools/perf/util/srcline.h
+++ b/tools/perf/util/srcline.h
@@ -13,6 +13,7 @@ char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
bool show_sym, bool show_addr, bool unwind_inlines);
void free_srcline(char *srcline);
+char *get_srcline_split(struct dso *dso, u64 addr, unsigned *line);

#define SRCLINE_UNKNOWN ((char *) "??:0")

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 378c418ca0c1..404cabf252b0 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -59,6 +59,7 @@ struct thread *thread__new(pid_t pid, pid_t tid)
list_add(&comm->list, &thread->comm_list);
refcount_set(&thread->refcnt, 1);
RB_CLEAR_NODE(&thread->rb_node);
+ srccode_state_init(&thread->srccode_state);
}

return thread;
@@ -91,6 +92,7 @@ void thread__delete(struct thread *thread)
comm__free(comm);
}
unwind__finish_access(thread);
+ srccode_state_free(&thread->srccode_state);

free(thread);
}
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 4eb849e9098f..791c6d08508e 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -7,6 +7,7 @@
#include <unistd.h>
#include <sys/types.h>
#include "symbol.h"
+#include "map.h"
#include <strlist.h>
#include <intlist.h>

@@ -34,6 +35,7 @@ struct thread {

void *priv;
struct thread_stack *ts;
+ struct srccode_state srccode_state;
#ifdef HAVE_LIBUNWIND_SUPPORT
void *addr_space;
struct unwind_libunwind_ops *unwind_libunwind_ops;
--
2.9.3
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