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authorKrister Johansen <kjlx@templeofstupid.com>2017-07-06 04:48:08 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-07-19 05:14:09 +0300
commit843ff37bb59edbe51d64e77ba1b3245a15a4dd9f (patch)
tree7c1e50cb4b60af9776364ec65118c9a0db0cbcdf /tools/perf/util/namespaces.h
parent86bcdb5a43997bb02ba25a76482c7bfc652ba45b (diff)
downloadlinux-843ff37bb59edbe51d64e77ba1b3245a15a4dd9f.tar.xz
perf symbols: Find symbols in different mount namespace
Teach perf how to resolve symbols from binaries that are in a different mount namespace from the tool. This allows perf to generate meaningful stack traces even if the binary resides in a different mount namespace from the tool. Signed-off-by: Krister Johansen <kjlx@templeofstupid.com> Tested-by: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas-Mich Richter <tmricht@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1499305693-1599-2-git-send-email-kjlx@templeofstupid.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/namespaces.h')
-rw-r--r--tools/perf/util/namespaces.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/tools/perf/util/namespaces.h b/tools/perf/util/namespaces.h
index 468f1e9a1484..b20f6ead7b2d 100644
--- a/tools/perf/util/namespaces.h
+++ b/tools/perf/util/namespaces.h
@@ -11,6 +11,7 @@
#include "../perf.h"
#include <linux/list.h>
+#include <linux/refcount.h>
struct namespaces_event;
@@ -23,4 +24,36 @@ struct namespaces {
struct namespaces *namespaces__new(struct namespaces_event *event);
void namespaces__free(struct namespaces *namespaces);
+struct nsinfo {
+ pid_t pid;
+ bool need_setns;
+ char *mntns_path;
+ refcount_t refcnt;
+};
+
+struct nscookie {
+ int oldns;
+ int newns;
+};
+
+void nsinfo__init(struct nsinfo *nsi);
+struct nsinfo *nsinfo__new(pid_t pid);
+void nsinfo__delete(struct nsinfo *nsi);
+
+struct nsinfo *nsinfo__get(struct nsinfo *nsi);
+void nsinfo__put(struct nsinfo *nsi);
+
+void nsinfo__mountns_enter(struct nsinfo *nsi, struct nscookie *nc);
+void nsinfo__mountns_exit(struct nscookie *nc);
+
+static inline void __nsinfo__zput(struct nsinfo **nsip)
+{
+ if (nsip) {
+ nsinfo__put(*nsip);
+ *nsip = NULL;
+ }
+}
+
+#define nsinfo__zput(nsi) __nsinfo__zput(&nsi)
+
#endif /* __PERF_NAMESPACES_H */