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perf tools: Add --debug-file option to redirect debug output

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Currently, debug messages is output to stderr, add --debug-file option to
support redirection to a specified file.

Some test scenarios:

  # perf --list-opts
  --help --version --exec-path --html-path --paginate --no-pager --debugfs-dir --buildid-dir --list-cmds --list-opts --debug --debug-file

  # perf --debug-file
  No path given for --debug-file.

   Usage: perf [--version] [--help] [OPTIONS] COMMAND [ARGS]

  # perf --debug-file /sys/perf.log record -v true
  Open debug file '/sys/perf.log' failed: Permission denied

   Usage: perf [--version] [--help] [OPTIONS] COMMAND [ARGS]

  # perf --debug-file /tmp/perf.log record -v true
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.013 MB perf.data (26 samples) ]
  # cat /tmp/perf.log
  DEBUGINFOD_URLS=
  Using CPUID GenuineIntel-6-3E-4
  nr_cblocks: 0
  affinity: SYS
  mmap flush: 1
  comp level: 0
  mmap size 528384B
  Control descriptor is not initialized
  mmap size 528384B
  Looking at the vmlinux_path (8 entries long)
  Using /proc/kcore for kernel data
  Using /proc/kallsyms for symbols
  symbol:unmap_start file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:unmap_complete file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:map_start file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:map_complete file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:reloc_start file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:reloc_complete file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:init_start file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:init_complete file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:lll_lock_wait_private file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:lll_lock_wait file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:setjmp file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:longjmp file:(null) line:0 offset:0 return:0 lazy:(null)
  symbol:longjmp_target file:(null) line:0 offset:0 return:0 lazy:(null)
  failed to write feature HYBRID_TOPOLOGY

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20231031105523.1472558-1-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Yang Jihong 2023-10-31 10:55:23 +00:00 committed by Arnaldo Carvalho de Melo
parent 08973307d2
commit 72108c0b9c
2 changed files with 33 additions and 0 deletions
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3
tools/perf/Documentation/perf.txt
View File

@ -64,6 +64,9 @@ OPTIONS
perf-event-open - Print perf_event_open() arguments and
return value
--debug-file::
Write debug output to a specified file.
DESCRIPTION
-----------
Performance counters for Linux are a new kernel-based subsystem

30
tools/perf/perf.c
View File

@ -39,6 +39,7 @@
#include <linux/zalloc.h>
static int use_pager = -1;
static FILE *debug_fp = NULL;
struct cmd_struct {
const char *cmd;
@ -162,6 +163,19 @@ static void commit_pager_choice(void)
}
}
static int set_debug_file(const char *path)
{
debug_fp = fopen(path, "w");
if (!debug_fp) {
fprintf(stderr, "Open debug file '%s' failed: %s\n",
path, strerror(errno));
return -1;
}
debug_set_file(debug_fp);
return 0;
}
struct option options[] = {
OPT_ARGUMENT("help", "help"),
OPT_ARGUMENT("version", "version"),
@ -174,6 +188,7 @@ struct option options[] = {
OPT_ARGUMENT("list-cmds", "list-cmds"),
OPT_ARGUMENT("list-opts", "list-opts"),
OPT_ARGUMENT("debug", "debug"),
OPT_ARGUMENT("debug-file", "debug-file"),
OPT_END()
};
@ -287,6 +302,18 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
(*argv)++;
(*argc)--;
} else if (!strcmp(cmd, "--debug-file")) {
if (*argc < 2) {
fprintf(stderr, "No path given for --debug-file.\n");
usage(perf_usage_string);
}
if (set_debug_file((*argv)[1]))
usage(perf_usage_string);
(*argv)++;
(*argc)--;
} else {
fprintf(stderr, "Unknown option: %s\n", cmd);
usage(perf_usage_string);
@ -547,5 +574,8 @@ int main(int argc, const char **argv)
fprintf(stderr, "Failed to run command '%s': %s\n",
cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
out:
if (debug_fp)
fclose(debug_fp);
return 1;
}