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perf tools: Make has_kcore_dir() work also for guest kcore_dir

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Copies of /proc/kallsyms, /proc/modules and an extract of /proc/kcore can
be stored in the perf.data output directory under the subdirectory named
kcore_dir. Guest machines will have their files also under subdirectories
beginning kcore_dir__ followed by the machine pid. Make has_kcore_dir()
return true also if there is a guest machine kcore_dir.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-22-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-07-11 12:32:04 +03:00 committed by Arnaldo Carvalho de Melo
parent 386e0d83d3
commit 65691e9ff0
1 changed files with 14 additions and 8 deletions
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22
tools/perf/util/data.c
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@ -3,6 +3,7 @@
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/zalloc.h>
#include <linux/err.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
@ -481,16 +482,21 @@ int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz)
bool has_kcore_dir(const char *path)
{
char *kcore_dir;
int ret;
struct dirent *d = ERR_PTR(-EINVAL);
const char *name = "kcore_dir";
DIR *dir = opendir(path);
size_t n = strlen(name);
bool result = false;
if (asprintf(&kcore_dir, "%s/kcore_dir", path) < 0)
return false;
if (dir) {
while (d && !result) {
d = readdir(dir);
result = d ? strncmp(d->d_name, name, n) : false;
}
closedir(dir);
}
ret = access(kcore_dir, F_OK);
free(kcore_dir);
return !ret;
return result;
}
char *perf_data__kallsyms_name(struct perf_data *data)