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perf tools: Automatically use guest kcore_dir if present

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When registering a guest machine using machine_pid from the id index,
check perf.data for a matching kcore_dir subdirectory and set the
kallsyms file name accordingly. If set, use it to find the machine's
kernel symbols and object code (from kcore).

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-23-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-07-11 12:32:05 +03:00 • committed by Arnaldo Carvalho de Melo
parent 65691e9ff0
commit a5367ecb53
5 changed files with 27 additions and 2 deletions
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19
tools/perf/util/data.c
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@ -518,6 +518,25 @@ char *perf_data__kallsyms_name(struct perf_data *data)
return kallsyms_name;
}
char *perf_data__guest_kallsyms_name(struct perf_data *data, pid_t machine_pid)
{
char *kallsyms_name;
struct stat st;
if (!data->is_dir)
return NULL;
if (asprintf(&kallsyms_name, "%s/kcore_dir__%d/kallsyms", data->path, machine_pid) < 0)
return NULL;
if (stat(kallsyms_name, &st)) {
free(kallsyms_name);
return NULL;
}
return kallsyms_name;
}
bool is_perf_data(const char *path)
{
bool ret = false;