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Message-ID: <20240912120303.2294175-1-changbin.du@huawei.com>
Date: Thu, 12 Sep 2024 20:03:03 +0800
From: Changbin Du <changbin.du@...wei.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim
<namhyung@...nel.org>
CC: Mark Rutland <mark.rutland@....com>, Alexander Shishkin
<alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, Ian
Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, "Liang,
Kan" <kan.liang@...ux.intel.com>, <linux-perf-users@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, Changbin Du <changbin.du@...wei.com>
Subject: [PATCH v2] perf buildid-cache: recognize vdso when adding files
Identify vdso by file name matching. The vdso objects have name
as vdso[32,64].so[.dbg].
$ perf buildid-cache -a /work/linux/arch/x86/entry/vdso/vdso64.so.dbg
Without this change, added vdso using above command actually will never
be used.
Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>
Tested-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Changbin Du <changbin.du@...wei.com>
---
This patch is separated from the series "perf: Support searching local
debugging vdso or specify vdso path in cmdline".
v2: also update build_id_cache__update_file().
---
tools/perf/builtin-buildid-cache.c | 34 ++++++++++++++++++++++++++++--
1 file changed, 32 insertions(+), 2 deletions(-)
diff --git a/tools/perf/builtin-buildid-cache.c b/tools/perf/builtin-buildid-cache.c
index b0511d16aeb6..69f43460d007 100644
--- a/tools/perf/builtin-buildid-cache.c
+++ b/tools/perf/builtin-buildid-cache.c
@@ -172,6 +172,36 @@ static int build_id_cache__add_kcore(const char *filename, bool force)
return 0;
}
+static bool filename_is_vdso(const char *filename)
+{
+ bool is_vdso = false;
+ char *fname, *bname;
+ static const char * const vdso_names[] = {
+ "vdso.so", "vdso32.so", "vdso64.so", "vdsox32.so"
+ };
+
+ fname = strdup(filename);
+ if (!fname) {
+ pr_err("no memory\n");
+ return false;
+ }
+
+ bname = basename(fname);
+ if (!bname)
+ goto out;
+
+ for (unsigned int i = 0; i < ARRAY_SIZE(vdso_names); i++) {
+ if (strstarts(bname, vdso_names[i])) {
+ is_vdso = true;
+ break;
+ }
+ }
+
+out:
+ free(fname);
+ return is_vdso;
+}
+
static int build_id_cache__add_file(const char *filename, struct nsinfo *nsi)
{
char sbuild_id[SBUILD_ID_SIZE];
@@ -189,7 +219,7 @@ static int build_id_cache__add_file(const char *filename, struct nsinfo *nsi)
build_id__sprintf(&bid, sbuild_id);
err = build_id_cache__add_s(sbuild_id, filename, nsi,
- false, false);
+ false, filename_is_vdso(filename));
pr_debug("Adding %s %s: %s\n", sbuild_id, filename,
err ? "FAIL" : "Ok");
return err;
@@ -323,7 +353,7 @@ static int build_id_cache__update_file(const char *filename, struct nsinfo *nsi)
if (!err)
err = build_id_cache__add_s(sbuild_id, filename, nsi, false,
- false);
+ filename_is_vdso(filename));
pr_debug("Updating %s %s: %s\n", sbuild_id, filename,
err ? "FAIL" : "Ok");
--
2.34.1
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