mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
perf tests: Add test for reading object code
Using the information in mmap events, perf tools can read object code associated with sampled addresses. A test is added that compares bytes read by perf with the same bytes read using objdump. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1375875537-4509-2-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
parent
3445432b7b
commit
b55ae0a976
4 changed files with 515 additions and 0 deletions
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@ -392,6 +392,7 @@ LIB_OBJS += $(OUTPUT)tests/sw-clock.o
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ifeq ($(ARCH),x86)
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LIB_OBJS += $(OUTPUT)tests/perf-time-to-tsc.o
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endif
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LIB_OBJS += $(OUTPUT)tests/code-reading.o
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BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o
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BUILTIN_OBJS += $(OUTPUT)builtin-bench.o
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@ -99,6 +99,10 @@ static struct test {
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.func = test__perf_time_to_tsc,
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},
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#endif
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{
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.desc = "Test object code reading",
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.func = test__code_reading,
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},
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{
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.func = NULL,
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},
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509
tools/perf/tests/code-reading.c
Normal file
509
tools/perf/tests/code-reading.c
Normal file
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@ -0,0 +1,509 @@
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#include <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <inttypes.h>
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#include <ctype.h>
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#include <string.h>
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#include "parse-events.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "machine.h"
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#include "event.h"
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#include "thread.h"
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#include "tests.h"
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#define BUFSZ 1024
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#define READLEN 128
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static unsigned int hex(char c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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return c - 'A' + 10;
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}
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static void read_objdump_line(const char *line, size_t line_len, void **buf,
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size_t *len)
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{
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const char *p;
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size_t i;
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/* Skip to a colon */
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p = strchr(line, ':');
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if (!p)
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return;
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i = p + 1 - line;
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/* Read bytes */
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while (*len) {
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char c1, c2;
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/* Skip spaces */
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for (; i < line_len; i++) {
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if (!isspace(line[i]))
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break;
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}
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/* Get 2 hex digits */
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if (i >= line_len || !isxdigit(line[i]))
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break;
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c1 = line[i++];
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if (i >= line_len || !isxdigit(line[i]))
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break;
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c2 = line[i++];
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/* Followed by a space */
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if (i < line_len && line[i] && !isspace(line[i]))
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break;
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/* Store byte */
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*(unsigned char *)*buf = (hex(c1) << 4) | hex(c2);
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*buf += 1;
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*len -= 1;
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}
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}
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static int read_objdump_output(FILE *f, void **buf, size_t *len)
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{
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char *line = NULL;
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size_t line_len;
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ssize_t ret;
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int err = 0;
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while (1) {
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ret = getline(&line, &line_len, f);
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if (feof(f))
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break;
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if (ret < 0) {
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pr_debug("getline failed\n");
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err = -1;
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break;
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}
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read_objdump_line(line, ret, buf, len);
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}
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free(line);
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return err;
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}
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static int read_via_objdump(const char *filename, u64 addr, void *buf,
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size_t len)
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{
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char cmd[PATH_MAX * 2];
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const char *fmt;
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FILE *f;
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int ret;
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fmt = "%s -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
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ret = snprintf(cmd, sizeof(cmd), fmt, "objdump", addr, addr + len,
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filename);
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if (ret <= 0 || (size_t)ret >= sizeof(cmd))
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return -1;
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pr_debug("Objdump command is: %s\n", cmd);
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f = popen(cmd, "r");
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if (!f) {
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pr_debug("popen failed\n");
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return -1;
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}
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ret = read_objdump_output(f, &buf, &len);
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if (len) {
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pr_debug("objdump read too few bytes\n");
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if (!ret)
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ret = len;
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}
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pclose(f);
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return ret;
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}
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static int read_object_code(u64 addr, size_t len, u8 cpumode,
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struct thread *thread, struct machine *machine)
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{
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struct addr_location al;
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unsigned char buf1[BUFSZ];
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unsigned char buf2[BUFSZ];
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size_t ret_len;
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u64 objdump_addr;
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int ret;
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pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
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thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION, addr,
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&al);
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if (!al.map || !al.map->dso) {
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pr_debug("thread__find_addr_map failed\n");
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return -1;
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}
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pr_debug("File is: %s\n", al.map->dso->long_name);
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if (al.map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
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pr_debug("Unexpected kernel address - skipping\n");
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return 0;
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}
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pr_debug("On file address is: %#"PRIx64"\n", al.addr);
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if (len > BUFSZ)
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len = BUFSZ;
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/* Do not go off the map */
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if (addr + len > al.map->end)
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len = al.map->end - addr;
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/* Read the object code using perf */
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ret_len = dso__data_read_offset(al.map->dso, machine, al.addr, buf1,
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len);
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if (ret_len != len) {
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pr_debug("dso__data_read_offset failed\n");
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return -1;
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}
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/*
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* Converting addresses for use by objdump requires more information.
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* map__load() does that. See map__rip_2objdump() for details.
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*/
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if (map__load(al.map, NULL))
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return -1;
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/* Read the object code using objdump */
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objdump_addr = map__rip_2objdump(al.map, al.addr);
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ret = read_via_objdump(al.map->dso->long_name, objdump_addr, buf2, len);
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if (ret > 0) {
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/*
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* The kernel maps are inaccurate - assume objdump is right in
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* that case.
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*/
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if (cpumode == PERF_RECORD_MISC_KERNEL ||
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cpumode == PERF_RECORD_MISC_GUEST_KERNEL) {
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len -= ret;
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if (len)
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pr_debug("Reducing len to %zu\n", len);
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else
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return -1;
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}
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}
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if (ret < 0) {
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pr_debug("read_via_objdump failed\n");
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return -1;
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}
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/* The results should be identical */
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if (memcmp(buf1, buf2, len)) {
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pr_debug("Bytes read differ from those read by objdump\n");
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return -1;
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}
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pr_debug("Bytes read match those read by objdump\n");
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return 0;
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}
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static int process_sample_event(struct machine *machine,
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struct perf_evlist *evlist,
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union perf_event *event)
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{
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struct perf_sample sample;
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struct thread *thread;
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u8 cpumode;
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if (perf_evlist__parse_sample(evlist, event, &sample)) {
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pr_debug("perf_evlist__parse_sample failed\n");
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return -1;
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}
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thread = machine__findnew_thread(machine, sample.pid);
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if (!thread) {
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pr_debug("machine__findnew_thread failed\n");
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return -1;
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}
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cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
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return read_object_code(sample.ip, READLEN, cpumode, thread, machine);
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}
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static int process_event(struct machine *machine, struct perf_evlist *evlist,
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union perf_event *event)
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{
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if (event->header.type == PERF_RECORD_SAMPLE)
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return process_sample_event(machine, evlist, event);
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if (event->header.type < PERF_RECORD_MAX)
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return machine__process_event(machine, event);
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return 0;
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}
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static int process_events(struct machine *machine, struct perf_evlist *evlist)
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{
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union perf_event *event;
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int i, ret;
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for (i = 0; i < evlist->nr_mmaps; i++) {
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while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
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ret = process_event(machine, evlist, event);
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if (ret < 0)
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return ret;
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}
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}
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return 0;
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}
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static int comp(const void *a, const void *b)
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{
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return *(int *)a - *(int *)b;
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}
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static void do_sort_something(void)
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{
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size_t sz = 40960;
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int buf[sz], i;
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for (i = 0; i < (int)sz; i++)
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buf[i] = sz - i - 1;
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qsort(buf, sz, sizeof(int), comp);
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for (i = 0; i < (int)sz; i++) {
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if (buf[i] != i) {
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pr_debug("qsort failed\n");
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break;
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}
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}
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}
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static void sort_something(void)
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{
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int i;
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for (i = 0; i < 10; i++)
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do_sort_something();
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}
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static void syscall_something(void)
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{
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int pipefd[2];
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int i;
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for (i = 0; i < 1000; i++) {
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if (pipe(pipefd) < 0) {
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pr_debug("pipe failed\n");
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break;
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}
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close(pipefd[1]);
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close(pipefd[0]);
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}
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}
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static void fs_something(void)
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{
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const char *test_file_name = "temp-perf-code-reading-test-file--";
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FILE *f;
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int i;
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for (i = 0; i < 1000; i++) {
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f = fopen(test_file_name, "w+");
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if (f) {
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fclose(f);
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unlink(test_file_name);
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}
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}
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}
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static void do_something(void)
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{
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fs_something();
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sort_something();
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syscall_something();
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}
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enum {
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TEST_CODE_READING_OK,
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TEST_CODE_READING_NO_VMLINUX,
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TEST_CODE_READING_NO_ACCESS,
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};
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static int do_test_code_reading(void)
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{
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struct machines machines;
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struct machine *machine;
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struct thread *thread;
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struct perf_record_opts opts = {
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.mmap_pages = UINT_MAX,
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.user_freq = UINT_MAX,
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.user_interval = ULLONG_MAX,
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.freq = 4000,
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.target = {
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.uses_mmap = true,
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},
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};
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struct thread_map *threads = NULL;
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struct cpu_map *cpus = NULL;
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struct perf_evlist *evlist = NULL;
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struct perf_evsel *evsel = NULL;
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int err = -1, ret;
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pid_t pid;
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struct map *map;
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bool have_vmlinux, excl_kernel = false;
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pid = getpid();
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machines__init(&machines);
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machine = &machines.host;
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ret = machine__create_kernel_maps(machine);
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if (ret < 0) {
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pr_debug("machine__create_kernel_maps failed\n");
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goto out_err;
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}
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/* Load kernel map */
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map = machine->vmlinux_maps[MAP__FUNCTION];
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ret = map__load(map, NULL);
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if (ret < 0) {
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pr_debug("map__load failed\n");
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goto out_err;
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}
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have_vmlinux = map->dso->symtab_type == DSO_BINARY_TYPE__VMLINUX;
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/* No point getting kernel events if there is no vmlinux */
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if (!have_vmlinux)
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excl_kernel = true;
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threads = thread_map__new_by_tid(pid);
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if (!threads) {
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pr_debug("thread_map__new_by_tid failed\n");
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goto out_err;
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}
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ret = perf_event__synthesize_thread_map(NULL, threads,
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perf_event__process, machine);
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if (ret < 0) {
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pr_debug("perf_event__synthesize_thread_map failed\n");
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goto out_err;
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}
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thread = machine__findnew_thread(machine, pid);
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if (!thread) {
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pr_debug("machine__findnew_thread failed\n");
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goto out_err;
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}
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cpus = cpu_map__new(NULL);
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if (!cpus) {
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pr_debug("cpu_map__new failed\n");
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goto out_err;
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}
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while (1) {
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const char *str;
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evlist = perf_evlist__new();
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if (!evlist) {
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pr_debug("perf_evlist__new failed\n");
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goto out_err;
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}
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perf_evlist__set_maps(evlist, cpus, threads);
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if (excl_kernel)
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str = "cycles:u";
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else
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str = "cycles";
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pr_debug("Parsing event '%s'\n", str);
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ret = parse_events(evlist, str);
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if (ret < 0) {
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pr_debug("parse_events failed\n");
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goto out_err;
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}
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perf_evlist__config(evlist, &opts);
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evsel = perf_evlist__first(evlist);
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evsel->attr.comm = 1;
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evsel->attr.disabled = 1;
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evsel->attr.enable_on_exec = 0;
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ret = perf_evlist__open(evlist);
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if (ret < 0) {
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if (!excl_kernel) {
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excl_kernel = true;
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perf_evlist__delete(evlist);
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evlist = NULL;
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continue;
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}
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pr_debug("perf_evlist__open failed\n");
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goto out_err;
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}
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break;
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}
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ret = perf_evlist__mmap(evlist, UINT_MAX, false);
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if (ret < 0) {
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pr_debug("perf_evlist__mmap failed\n");
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goto out_err;
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}
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perf_evlist__enable(evlist);
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do_something();
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perf_evlist__disable(evlist);
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ret = process_events(machine, evlist);
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if (ret < 0)
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goto out_err;
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if (!have_vmlinux)
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err = TEST_CODE_READING_NO_VMLINUX;
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else if (excl_kernel)
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err = TEST_CODE_READING_NO_ACCESS;
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else
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err = TEST_CODE_READING_OK;
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out_err:
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if (evlist) {
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perf_evlist__munmap(evlist);
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perf_evlist__close(evlist);
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perf_evlist__delete(evlist);
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}
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if (cpus)
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cpu_map__delete(cpus);
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if (threads)
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thread_map__delete(threads);
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machines__destroy_kernel_maps(&machines);
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machine__delete_threads(machine);
|
||||
machines__exit(&machines);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
int test__code_reading(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = do_test_code_reading();
|
||||
|
||||
switch (ret) {
|
||||
case TEST_CODE_READING_OK:
|
||||
return 0;
|
||||
case TEST_CODE_READING_NO_VMLINUX:
|
||||
fprintf(stderr, " (no vmlinux)");
|
||||
return 0;
|
||||
case TEST_CODE_READING_NO_ACCESS:
|
||||
fprintf(stderr, " (no access)");
|
||||
return 0;
|
||||
default:
|
||||
return -1;
|
||||
};
|
||||
}
|
|
@ -36,5 +36,6 @@ int test__bp_signal_overflow(void);
|
|||
int test__task_exit(void);
|
||||
int test__sw_clock_freq(void);
|
||||
int test__perf_time_to_tsc(void);
|
||||
int test__code_reading(void);
|
||||
|
||||
#endif /* TESTS_H */
|
||||
|
|
Loading…
Reference in a new issue