__u64 raw_callchain_nr; /* Number of raw_callchain entries */
const __u64 *raw_callchain; /* Refer <linux/perf_event.h> */
const char *event;
+ __s32 machine_pid;
+ __s32 vcpu;
};
----
+Note: 'machine_pid' and 'vcpu' are not original members, but were added together later.
+'size' can be used to determine their presence at run time.
+PERF_DLFILTER_HAS_MACHINE_PID will be defined if they are present at compile time.
+For example:
+[source,c]
+----
+#include <perf/perf_dlfilter.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+static inline bool have_machine_pid(const struct perf_dlfilter_sample *sample)
+{
+#ifdef PERF_DLFILTER_HAS_MACHINE_PID
+ return sample->size >= offsetof(struct perf_dlfilter_sample, vcpu) + sizeof(sample->vcpu);
+#else
+ return false;
+#endif
+}
+----
+
The perf_dlfilter_fns structure
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#include <linux/perf_event.h>
#include <linux/types.h>
+/*
+ * The following macro can be used to determine if this header defines
+ * perf_dlfilter_sample machine_pid and vcpu.
+ */
+#define PERF_DLFILTER_HAS_MACHINE_PID
+
/* Definitions for perf_dlfilter_sample flags */
enum {
PERF_DLFILTER_FLAG_BRANCH = 1ULL << 0,
__u64 raw_callchain_nr; /* Number of raw_callchain entries */
const __u64 *raw_callchain; /* Refer <linux/perf_event.h> */
const char *event;
+ __s32 machine_pid;
+ __s32 vcpu;
};
/*