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ee756ef749
Add reference count checking to struct dso, this can help with implementing correct reference counting discipline. To avoid RC_CHK_ACCESS everywhere, add accessor functions for the variables in struct dso. The majority of the change is mechanical in nature and not easy to split up. Committer testing: 'perf test' up to this patch shows no regressions. But: util/symbol.c: In function ‘dso__load_bfd_symbols’: util/symbol.c:1683:9: error: too few arguments to function ‘dso__set_adjust_symbols’ 1683 | dso__set_adjust_symbols(dso); | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from util/symbol.c:21: util/dso.h:268:20: note: declared here 268 | static inline void dso__set_adjust_symbols(struct dso *dso, bool val) | ^~~~~~~~~~~~~~~~~~~~~~~ make[6]: *** [/home/acme/git/perf-tools-next/tools/build/Makefile.build:106: /tmp/tmp.ZWHbQftdN6/util/symbol.o] Error 1 MKDIR /tmp/tmp.ZWHbQftdN6/tests/workloads/ make[6]: *** Waiting for unfinished jobs.... This was updated: - symbols__fixup_end(&dso->symbols, false); - symbols__fixup_duplicate(&dso->symbols); - dso->adjust_symbols = 1; + symbols__fixup_end(dso__symbols(dso), false); + symbols__fixup_duplicate(dso__symbols(dso)); + dso__set_adjust_symbols(dso); But not build tested with BUILD_NONDISTRO and libbfd devel files installed (binutils-devel on fedora). Add the missing argument: symbols__fixup_end(dso__symbols(dso), false); symbols__fixup_duplicate(dso__symbols(dso)); - dso__set_adjust_symbols(dso); + dso__set_adjust_symbols(dso, true); Signed-off-by: Ian Rogers <irogers@google.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Ben Gainey <ben.gainey@arm.com> Cc: Changbin Du <changbin.du@huawei.com> Cc: Chengen Du <chengen.du@canonical.com> Cc: Colin Ian King <colin.i.king@gmail.com> Cc: Dima Kogan <dima@secretsauce.net> Cc: Ilkka Koskinen <ilkka@os.amperecomputing.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: K Prateek Nayak <kprateek.nayak@amd.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Leo Yan <leo.yan@linux.dev> Cc: Li Dong <lidong@vivo.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paran Lee <p4ranlee@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Song Liu <song@kernel.org> Cc: Sun Haiyong <sunhaiyong@loongson.cn> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: Tiezhu Yang <yangtiezhu@loongson.cn> Cc: Yanteng Si <siyanteng@loongson.cn> Cc: zhaimingbing <zhaimingbing@cmss.chinamobile.com> Link: https://lore.kernel.org/r/20240504213803.218974-6-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
738 lines
16 KiB
C
738 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <inttypes.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 <string.h>
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#include <sys/param.h>
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#include <perf/cpumap.h>
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#include <perf/evlist.h>
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#include <perf/mmap.h>
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#include "debug.h"
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#include "dso.h"
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#include "env.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 "machine.h"
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#include "map.h"
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#include "symbol.h"
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#include "event.h"
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#include "record.h"
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#include "util/mmap.h"
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#include "util/string2.h"
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#include "util/synthetic-events.h"
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#include "util/util.h"
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#include "thread.h"
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#include "tests.h"
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#include <linux/ctype.h>
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#define BUFSZ 1024
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#define READLEN 128
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struct state {
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u64 done[1024];
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size_t done_cnt;
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};
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static size_t read_objdump_chunk(const char **line, unsigned char **buf,
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size_t *buf_len)
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{
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size_t bytes_read = 0;
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unsigned char *chunk_start = *buf;
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/* Read bytes */
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while (*buf_len > 0) {
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char c1, c2;
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/* Get 2 hex digits */
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c1 = *(*line)++;
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if (!isxdigit(c1))
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break;
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c2 = *(*line)++;
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if (!isxdigit(c2))
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break;
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/* Store byte and advance buf */
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**buf = (hex(c1) << 4) | hex(c2);
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(*buf)++;
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(*buf_len)--;
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bytes_read++;
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/* End of chunk? */
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if (isspace(**line))
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break;
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}
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/*
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* objdump will display raw insn as LE if code endian
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* is LE and bytes_per_chunk > 1. In that case reverse
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* the chunk we just read.
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*
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* see disassemble_bytes() at binutils/objdump.c for details
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* how objdump chooses display endian)
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*/
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if (bytes_read > 1 && !host_is_bigendian()) {
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unsigned char *chunk_end = chunk_start + bytes_read - 1;
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unsigned char tmp;
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while (chunk_start < chunk_end) {
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tmp = *chunk_start;
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*chunk_start = *chunk_end;
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*chunk_end = tmp;
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chunk_start++;
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chunk_end--;
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}
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}
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return bytes_read;
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}
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static size_t read_objdump_line(const char *line, unsigned char *buf,
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size_t buf_len)
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{
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const char *p;
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size_t ret, bytes_read = 0;
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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 0;
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p++;
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/* Skip initial spaces */
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while (*p) {
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if (!isspace(*p))
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break;
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p++;
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}
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do {
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ret = read_objdump_chunk(&p, &buf, &buf_len);
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bytes_read += ret;
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p++;
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} while (ret > 0);
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/* return number of successfully read bytes */
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return bytes_read;
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}
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static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr)
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{
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char *line = NULL;
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size_t line_len, off_last = 0;
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ssize_t ret;
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int err = 0;
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u64 addr, last_addr = start_addr;
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while (off_last < *len) {
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size_t off, read_bytes, written_bytes;
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unsigned char tmp[BUFSZ];
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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 data into temporary buffer */
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read_bytes = read_objdump_line(line, tmp, sizeof(tmp));
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if (!read_bytes)
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continue;
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if (sscanf(line, "%"PRIx64, &addr) != 1)
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continue;
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if (addr < last_addr) {
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pr_debug("addr going backwards, read beyond section?\n");
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break;
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}
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last_addr = addr;
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/* copy it from temporary buffer to 'buf' according
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* to address on current objdump line */
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off = addr - start_addr;
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if (off >= *len)
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break;
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written_bytes = MIN(read_bytes, *len - off);
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memcpy(buf + off, tmp, written_bytes);
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off_last = off + written_bytes;
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}
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/* len returns number of bytes that could not be read */
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*len -= off_last;
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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 -z -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
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ret = snprintf(cmd, sizeof(cmd), fmt, test_objdump_path, 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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/* Ignore objdump errors */
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strcat(cmd, " 2>/dev/null");
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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, addr);
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if (len) {
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pr_debug("objdump read too few bytes: %zd\n", len);
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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 void dump_buf(unsigned char *buf, size_t len)
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{
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size_t i;
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for (i = 0; i < len; i++) {
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pr_debug("0x%02x ", buf[i]);
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if (i % 16 == 15)
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pr_debug("\n");
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}
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pr_debug("\n");
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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 state *state)
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{
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struct addr_location al;
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unsigned char buf1[BUFSZ] = {0};
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unsigned char buf2[BUFSZ] = {0};
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size_t ret_len;
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u64 objdump_addr;
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const char *objdump_name;
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char decomp_name[KMOD_DECOMP_LEN];
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bool decomp = false;
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int ret, err = 0;
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struct dso *dso;
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pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
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addr_location__init(&al);
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if (!thread__find_map(thread, cpumode, addr, &al) || !map__dso(al.map)) {
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if (cpumode == PERF_RECORD_MISC_HYPERVISOR) {
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pr_debug("Hypervisor address can not be resolved - skipping\n");
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goto out;
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}
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pr_debug("thread__find_map failed\n");
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err = -1;
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goto out;
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}
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dso = map__dso(al.map);
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pr_debug("File is: %s\n", dso__long_name(dso));
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if (dso__symtab_type(dso) == DSO_BINARY_TYPE__KALLSYMS && !dso__is_kcore(dso)) {
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pr_debug("Unexpected kernel address - skipping\n");
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goto out;
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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 > map__end(al.map))
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len = map__end(al.map) - addr;
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/*
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* Some architectures (ex: powerpc) have stubs (trampolines) in kernel
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* modules to manage long jumps. Check if the ip offset falls in stubs
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* sections for kernel modules. And skip module address after text end
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*/
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if (dso__is_kmod(dso) && al.addr > dso__text_end(dso)) {
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pr_debug("skipping the module address %#"PRIx64" after text end\n", al.addr);
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goto out;
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}
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/* Read the object code using perf */
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ret_len = dso__data_read_offset(dso, maps__machine(thread__maps(thread)),
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al.addr, buf1, 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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err = -1;
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goto out;
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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)) {
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err = -1;
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goto out;
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}
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/* objdump struggles with kcore - try each map only once */
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if (dso__is_kcore(dso)) {
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size_t d;
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for (d = 0; d < state->done_cnt; d++) {
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if (state->done[d] == map__start(al.map)) {
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pr_debug("kcore map tested already");
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pr_debug(" - skipping\n");
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goto out;
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}
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}
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if (state->done_cnt >= ARRAY_SIZE(state->done)) {
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pr_debug("Too many kcore maps - skipping\n");
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goto out;
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}
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state->done[state->done_cnt++] = map__start(al.map);
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}
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objdump_name = dso__long_name(dso);
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if (dso__needs_decompress(dso)) {
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if (dso__decompress_kmodule_path(dso, objdump_name,
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decomp_name,
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sizeof(decomp_name)) < 0) {
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pr_debug("decompression failed\n");
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err = -1;
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goto out;
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}
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decomp = true;
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objdump_name = decomp_name;
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}
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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(objdump_name, objdump_addr, buf2, len);
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if (decomp)
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unlink(objdump_name);
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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 if (dso__is_kcore(dso)) {
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/*
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* objdump cannot handle very large segments
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* that may be found in kcore.
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*/
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pr_debug("objdump failed for kcore");
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pr_debug(" - skipping\n");
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} else {
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err = -1;
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}
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goto out;
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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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err = -1;
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goto out;
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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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pr_debug("buf1 (dso):\n");
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dump_buf(buf1, len);
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pr_debug("buf2 (objdump):\n");
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dump_buf(buf2, len);
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err = -1;
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goto out;
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}
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pr_debug("Bytes read match those read by objdump\n");
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out:
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addr_location__exit(&al);
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return err;
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}
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static int process_sample_event(struct machine *machine,
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struct evlist *evlist,
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union perf_event *event, struct state *state)
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{
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struct perf_sample sample;
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struct thread *thread;
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int ret;
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if (evlist__parse_sample(evlist, event, &sample)) {
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pr_debug("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, sample.tid);
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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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ret = read_object_code(sample.ip, READLEN, sample.cpumode, thread, state);
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thread__put(thread);
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return ret;
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}
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static int process_event(struct machine *machine, struct evlist *evlist,
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union perf_event *event, struct state *state)
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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, state);
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if (event->header.type == PERF_RECORD_THROTTLE ||
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event->header.type == PERF_RECORD_UNTHROTTLE)
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return 0;
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if (event->header.type < PERF_RECORD_MAX) {
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int ret;
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ret = machine__process_event(machine, event, NULL);
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if (ret < 0)
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pr_debug("machine__process_event failed, event type %u\n",
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event->header.type);
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return ret;
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}
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return 0;
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}
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static int process_events(struct machine *machine, struct evlist *evlist,
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struct state *state)
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{
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union perf_event *event;
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struct mmap *md;
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int i, ret;
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for (i = 0; i < evlist->core.nr_mmaps; i++) {
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md = &evlist->mmap[i];
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if (perf_mmap__read_init(&md->core) < 0)
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continue;
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while ((event = perf_mmap__read_event(&md->core)) != NULL) {
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ret = process_event(machine, evlist, event, state);
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perf_mmap__consume(&md->core);
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if (ret < 0)
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return ret;
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}
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perf_mmap__read_done(&md->core);
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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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int buf[40960], i;
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for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
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buf[i] = ARRAY_SIZE(buf) - i - 1;
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qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
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for (i = 0; i < (int)ARRAY_SIZE(buf); 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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}
|
|
}
|
|
}
|
|
|
|
static void sort_something(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 10; i++)
|
|
do_sort_something();
|
|
}
|
|
|
|
static void syscall_something(void)
|
|
{
|
|
int pipefd[2];
|
|
int i;
|
|
|
|
for (i = 0; i < 1000; i++) {
|
|
if (pipe(pipefd) < 0) {
|
|
pr_debug("pipe failed\n");
|
|
break;
|
|
}
|
|
close(pipefd[1]);
|
|
close(pipefd[0]);
|
|
}
|
|
}
|
|
|
|
static void fs_something(void)
|
|
{
|
|
const char *test_file_name = "temp-perf-code-reading-test-file--";
|
|
FILE *f;
|
|
int i;
|
|
|
|
for (i = 0; i < 1000; i++) {
|
|
f = fopen(test_file_name, "w+");
|
|
if (f) {
|
|
fclose(f);
|
|
unlink(test_file_name);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void do_something(void)
|
|
{
|
|
fs_something();
|
|
|
|
sort_something();
|
|
|
|
syscall_something();
|
|
}
|
|
|
|
enum {
|
|
TEST_CODE_READING_OK,
|
|
TEST_CODE_READING_NO_VMLINUX,
|
|
TEST_CODE_READING_NO_KCORE,
|
|
TEST_CODE_READING_NO_ACCESS,
|
|
TEST_CODE_READING_NO_KERNEL_OBJ,
|
|
};
|
|
|
|
static int do_test_code_reading(bool try_kcore)
|
|
{
|
|
struct machine *machine;
|
|
struct thread *thread;
|
|
struct record_opts opts = {
|
|
.mmap_pages = UINT_MAX,
|
|
.user_freq = UINT_MAX,
|
|
.user_interval = ULLONG_MAX,
|
|
.freq = 500,
|
|
.target = {
|
|
.uses_mmap = true,
|
|
},
|
|
};
|
|
struct state state = {
|
|
.done_cnt = 0,
|
|
};
|
|
struct perf_thread_map *threads = NULL;
|
|
struct perf_cpu_map *cpus = NULL;
|
|
struct evlist *evlist = NULL;
|
|
struct evsel *evsel = NULL;
|
|
int err = -1, ret;
|
|
pid_t pid;
|
|
struct map *map;
|
|
bool have_vmlinux, have_kcore;
|
|
struct dso *dso;
|
|
const char *events[] = { "cycles", "cycles:u", "cpu-clock", "cpu-clock:u", NULL };
|
|
int evidx = 0;
|
|
|
|
pid = getpid();
|
|
|
|
machine = machine__new_host();
|
|
machine->env = &perf_env;
|
|
|
|
ret = machine__create_kernel_maps(machine);
|
|
if (ret < 0) {
|
|
pr_debug("machine__create_kernel_maps failed\n");
|
|
goto out_err;
|
|
}
|
|
|
|
/* Force the use of kallsyms instead of vmlinux to try kcore */
|
|
if (try_kcore)
|
|
symbol_conf.kallsyms_name = "/proc/kallsyms";
|
|
|
|
/* Load kernel map */
|
|
map = machine__kernel_map(machine);
|
|
ret = map__load(map);
|
|
if (ret < 0) {
|
|
pr_debug("map__load failed\n");
|
|
goto out_err;
|
|
}
|
|
dso = map__dso(map);
|
|
have_vmlinux = dso__is_vmlinux(dso);
|
|
have_kcore = dso__is_kcore(dso);
|
|
|
|
/* 2nd time through we just try kcore */
|
|
if (try_kcore && !have_kcore)
|
|
return TEST_CODE_READING_NO_KCORE;
|
|
|
|
/* No point getting kernel events if there is no kernel object */
|
|
if (!have_vmlinux && !have_kcore)
|
|
evidx++;
|
|
|
|
threads = thread_map__new_by_tid(pid);
|
|
if (!threads) {
|
|
pr_debug("thread_map__new_by_tid failed\n");
|
|
goto out_err;
|
|
}
|
|
|
|
ret = perf_event__synthesize_thread_map(NULL, threads,
|
|
perf_event__process, machine,
|
|
true, false);
|
|
if (ret < 0) {
|
|
pr_debug("perf_event__synthesize_thread_map failed\n");
|
|
goto out_err;
|
|
}
|
|
|
|
thread = machine__findnew_thread(machine, pid, pid);
|
|
if (!thread) {
|
|
pr_debug("machine__findnew_thread failed\n");
|
|
goto out_put;
|
|
}
|
|
|
|
cpus = perf_cpu_map__new_online_cpus();
|
|
if (!cpus) {
|
|
pr_debug("perf_cpu_map__new failed\n");
|
|
goto out_put;
|
|
}
|
|
|
|
while (events[evidx]) {
|
|
const char *str;
|
|
|
|
evlist = evlist__new();
|
|
if (!evlist) {
|
|
pr_debug("evlist__new failed\n");
|
|
goto out_put;
|
|
}
|
|
|
|
perf_evlist__set_maps(&evlist->core, cpus, threads);
|
|
|
|
str = events[evidx];
|
|
pr_debug("Parsing event '%s'\n", str);
|
|
ret = parse_event(evlist, str);
|
|
if (ret < 0) {
|
|
pr_debug("parse_events failed\n");
|
|
goto out_put;
|
|
}
|
|
|
|
evlist__config(evlist, &opts, NULL);
|
|
|
|
evlist__for_each_entry(evlist, evsel) {
|
|
evsel->core.attr.comm = 1;
|
|
evsel->core.attr.disabled = 1;
|
|
evsel->core.attr.enable_on_exec = 0;
|
|
}
|
|
|
|
ret = evlist__open(evlist);
|
|
if (ret < 0) {
|
|
evidx++;
|
|
|
|
if (events[evidx] == NULL && verbose > 0) {
|
|
char errbuf[512];
|
|
evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
|
|
pr_debug("perf_evlist__open() failed!\n%s\n", errbuf);
|
|
}
|
|
|
|
/*
|
|
* Both cpus and threads are now owned by evlist
|
|
* and will be freed by following perf_evlist__set_maps
|
|
* call. Getting reference to keep them alive.
|
|
*/
|
|
perf_cpu_map__get(cpus);
|
|
perf_thread_map__get(threads);
|
|
perf_evlist__set_maps(&evlist->core, NULL, NULL);
|
|
evlist__delete(evlist);
|
|
evlist = NULL;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (events[evidx] == NULL)
|
|
goto out_put;
|
|
|
|
ret = evlist__mmap(evlist, UINT_MAX);
|
|
if (ret < 0) {
|
|
pr_debug("evlist__mmap failed\n");
|
|
goto out_put;
|
|
}
|
|
|
|
evlist__enable(evlist);
|
|
|
|
do_something();
|
|
|
|
evlist__disable(evlist);
|
|
|
|
ret = process_events(machine, evlist, &state);
|
|
if (ret < 0)
|
|
goto out_put;
|
|
|
|
if (!have_vmlinux && !have_kcore && !try_kcore)
|
|
err = TEST_CODE_READING_NO_KERNEL_OBJ;
|
|
else if (!have_vmlinux && !try_kcore)
|
|
err = TEST_CODE_READING_NO_VMLINUX;
|
|
else if (strstr(events[evidx], ":u"))
|
|
err = TEST_CODE_READING_NO_ACCESS;
|
|
else
|
|
err = TEST_CODE_READING_OK;
|
|
out_put:
|
|
thread__put(thread);
|
|
out_err:
|
|
evlist__delete(evlist);
|
|
perf_cpu_map__put(cpus);
|
|
perf_thread_map__put(threads);
|
|
machine__delete(machine);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int test__code_reading(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
|
|
{
|
|
int ret;
|
|
|
|
ret = do_test_code_reading(false);
|
|
if (!ret)
|
|
ret = do_test_code_reading(true);
|
|
|
|
switch (ret) {
|
|
case TEST_CODE_READING_OK:
|
|
return 0;
|
|
case TEST_CODE_READING_NO_VMLINUX:
|
|
pr_debug("no vmlinux\n");
|
|
return 0;
|
|
case TEST_CODE_READING_NO_KCORE:
|
|
pr_debug("no kcore\n");
|
|
return 0;
|
|
case TEST_CODE_READING_NO_ACCESS:
|
|
pr_debug("no access\n");
|
|
return 0;
|
|
case TEST_CODE_READING_NO_KERNEL_OBJ:
|
|
pr_debug("no kernel obj\n");
|
|
return 0;
|
|
default:
|
|
return -1;
|
|
};
|
|
}
|
|
|
|
DEFINE_SUITE("Object code reading", code_reading);
|