perf buildid-cache: Support binary objects from other namespaces
Teach buildid-cache how to add, remove, and update binary objects from
other mount namespaces. Allow probe events tracing binaries in
different namespaces to add their objects to the probe and build-id
caches too. As a handy side effect, this also lets us access SDT probes
in binaries from alternate mount namespaces.
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/1499305693-1599-5-git-send-email-kjlx@templeofstupid.com
[ Add util/namespaces.c to tools/perf/util/python-ext-sources, to fix the python binding 'perf test' ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 988111e..9e4ea85 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -143,13 +143,17 @@ struct strlist *lsdir(const char *name,
return list;
}
-static int slow_copyfile(const char *from, const char *to)
+static int slow_copyfile(const char *from, const char *to, struct nsinfo *nsi)
{
int err = -1;
char *line = NULL;
size_t n;
- FILE *from_fp = fopen(from, "r"), *to_fp;
+ FILE *from_fp, *to_fp;
+ struct nscookie nsc;
+ nsinfo__mountns_enter(nsi, &nsc);
+ from_fp = fopen(from, "r");
+ nsinfo__mountns_exit(&nsc);
if (from_fp == NULL)
goto out;
@@ -198,15 +202,21 @@ int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
return size ? -1 : 0;
}
-int copyfile_mode(const char *from, const char *to, mode_t mode)
+static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
+ struct nsinfo *nsi)
{
int fromfd, tofd;
struct stat st;
- int err = -1;
+ int err;
char *tmp = NULL, *ptr = NULL;
+ struct nscookie nsc;
- if (stat(from, &st))
+ nsinfo__mountns_enter(nsi, &nsc);
+ err = stat(from, &st);
+ nsinfo__mountns_exit(&nsc);
+ if (err)
goto out;
+ err = -1;
/* extra 'x' at the end is to reserve space for '.' */
if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
@@ -227,11 +237,13 @@ int copyfile_mode(const char *from, const char *to, mode_t mode)
goto out_close_to;
if (st.st_size == 0) { /* /proc? do it slowly... */
- err = slow_copyfile(from, tmp);
+ err = slow_copyfile(from, tmp, nsi);
goto out_close_to;
}
+ nsinfo__mountns_enter(nsi, &nsc);
fromfd = open(from, O_RDONLY);
+ nsinfo__mountns_exit(&nsc);
if (fromfd < 0)
goto out_close_to;
@@ -248,6 +260,16 @@ int copyfile_mode(const char *from, const char *to, mode_t mode)
return err;
}
+int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi)
+{
+ return copyfile_mode_ns(from, to, 0755, nsi);
+}
+
+int copyfile_mode(const char *from, const char *to, mode_t mode)
+{
+ return copyfile_mode_ns(from, to, mode, NULL);
+}
+
int copyfile(const char *from, const char *to)
{
return copyfile_mode(from, to, 0755);