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perf inject: Keep a copy of kcore_dir

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If the input perf.data has a kcore_dir, copy it into the output, since
at least the kallsyms in the kcore_dir will be useful to the output.

Example:

 Before:

  $ ls -lR perf.data-from-desktop
  perf.data-from-desktop:
  total 916
  -rw------- 1 user user 931756 May 19 09:55 data
  drwx------ 2 user user   4096 May 19 09:55 kcore_dir

  perf.data-from-desktop/kcore_dir:
  total 42952
  -r-------- 1 user user  7582467 May 19 09:55 kallsyms
  -r-------- 1 user user 36388864 May 19 09:55 kcore
  -r-------- 1 user user     4828 May 19 09:55 modules

  $ perf inject -i perf.data-from-desktop -o injected-perf.data

  $ ls -lR injected-perf.data
  -rw------- 1 user user 931320 May 20 15:08 injected-perf.data

 After:

  $ perf inject -i perf.data-from-desktop -o injected-perf.data

  $ ls -lR injected-perf.data
  injected-perf.data:
  total 916
  -rw------- 1 user user 931320 May 20 15:21 data
  drwx------ 2 user user   4096 May 20 15:21 kcore_dir

  injected-perf.data/kcore_dir:
  total 42952
  -r-------- 1 user user  7582467 May 20 15:21 kallsyms
  -r-------- 1 user user 36388864 May 20 15:21 kcore
  -r-------- 1 user user     4828 May 20 15:21 modules

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220520132404.25853-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-05-20 16:24:04 +03:00 committed by Arnaldo Carvalho de Melo
parent a4455e0053
commit d8fc085509
1 changed files with 30 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
tools/perf/builtin-inject.c
View File

@ -50,6 +50,7 @@ struct perf_inject {
bool in_place_update;
bool in_place_update_dry_run;
bool is_pipe;
bool copy_kcore_dir;
const char *input_name;
struct perf_data output;
u64 bytes_written;
@ -880,6 +881,19 @@ static int feat_copy_cb(struct feat_copier *fc, int feat, struct feat_writer *fw
return 1; /* Feature section copied */
}
static int copy_kcore_dir(struct perf_inject *inject)
{
char *cmd;
int ret;
ret = asprintf(&cmd, "cp -r -n %s/kcore_dir* %s >/dev/null 2>&1",
inject->input_name, inject->output.path);
if (ret < 0)
return ret;
pr_debug("%s\n", cmd);
return system(cmd);
}
static int output_fd(struct perf_inject *inject)
{
return inject->in_place_update ? -1 : perf_data__fd(&inject->output);
@ -995,6 +1009,12 @@ static int __cmd_inject(struct perf_inject *inject)
session->header.data_offset = output_data_offset;
session->header.data_size = inject->bytes_written;
perf_session__inject_header(session, session->evlist, fd, &inj_fc.fc);
if (inject->copy_kcore_dir) {
ret = copy_kcore_dir(inject);
if (ret)
return ret;
}
}
return ret;
@ -1131,9 +1151,16 @@ int cmd_inject(int argc, const char **argv)
}
if (!inject.in_place_update_dry_run)
data.in_place_update = true;
} else if (perf_data__open(&inject.output)) {
perror("failed to create output file");
return -1;
} else {
if (strcmp(inject.output.path, "-") && !inject.strip &&
has_kcore_dir(inject.input_name)) {
inject.output.is_dir = true;
inject.copy_kcore_dir = true;
}
if (perf_data__open(&inject.output)) {
perror("failed to create output file");
return -1;
}
}
data.path = inject.input_name;