xen/common/Kconfig | 9 +++++++++ xen/common/Makefile | 2 +- xen/include/xen/trace.h | 26 ++++++++++++++++++++++++++ 3 files changed, 36 insertions(+), 1 deletion(-)
Xen internal running status(trace event at pre-defined trace point)
will be saved to trace memory when enabled.
Trace event data and config params can be read/changed
by system control hypercall at run time.
Can be disabled for smaller code footprint.
Signed-off-by: Baodong Chen <chenbaodong@mxnavi.com>
---
xen/common/Kconfig | 9 +++++++++
xen/common/Makefile | 2 +-
xen/include/xen/trace.h | 26 ++++++++++++++++++++++++++
3 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/xen/common/Kconfig b/xen/common/Kconfig
index c838506..ecb8f75 100644
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -368,4 +368,13 @@ config DOM0_MEM
Leave empty if you are not sure what to specify.
+config TRACEBUFFER
+ bool "Enable tracing infrastructure" if EXPERT = "y"
+ default y
+ ---help---
+ Enable tracing infrastructure and pre-defined tracepoints within Xen.
+ This will allow live information about Xen’s execution and performance
+ to be collected at run time for debugging or performance analysis.
+ Memory and execution overhead when not active is minimal.
+
endmenu
diff --git a/xen/common/Makefile b/xen/common/Makefile
index bca48e6..9fd1bd2 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -56,7 +56,7 @@ obj-y += sysctl.o
obj-y += tasklet.o
obj-y += time.o
obj-y += timer.o
-obj-y += trace.o
+obj-$(CONFIG_TRACEBUFFER) += trace.o
obj-y += version.o
obj-y += virtual_region.o
obj-y += vm_event.o
diff --git a/xen/include/xen/trace.h b/xen/include/xen/trace.h
index 12966ea..fad92c7 100644
--- a/xen/include/xen/trace.h
+++ b/xen/include/xen/trace.h
@@ -21,12 +21,18 @@
#ifndef __XEN_TRACE_H__
#define __XEN_TRACE_H__
+/* Put 'tb_init_done' here because 'asm/trace.h' may use it */
+#ifdef CONFIG_TRACEBUFFER
extern int tb_init_done;
+#else
+#define tb_init_done false
+#endif
#include <public/sysctl.h>
#include <public/trace.h>
#include <asm/trace.h>
+#ifdef CONFIG_TRACEBUFFER
/* Used to initialise trace buffer functionality */
void init_trace_bufs(void);
@@ -47,6 +53,26 @@ static inline void trace_var(u32 event, int cycles, int extra,
void __trace_hypercall(uint32_t event, unsigned long op,
const xen_ulong_t *args);
+#else
+static inline void init_trace_bufs(void) {}
+static inline int tb_control(struct xen_sysctl_tbuf_op *tbc)
+{
+ return -ENOSYS;
+}
+
+static inline int trace_will_trace_event(uint32_t event)
+{
+ return 0;
+}
+
+static inline void trace_var(uint32_t event, int cycles, int extra,
+ const void *extra_data) {}
+static inline void __trace_var(uint32_t event, bool cycles, unsigned int extra,
+ const void *extra_data) {}
+static inline void __trace_hypercall(uint32_t event, unsigned long op,
+ const xen_ulong_t *args) {}
+#endif
+
/* Convenience macros for calling the trace function. */
#define TRACE_0D(_e) \
do { \
--
2.7.4
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Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-develOn 6/10/19 2:01 AM, Baodong Chen wrote: > Xen internal running status(trace event at pre-defined trace point) > will be saved to trace memory when enabled. > Trace event data and config params can be read/changed > by system control hypercall at run time. > > Can be disabled for smaller code footprint. > > Signed-off-by: Baodong Chen <chenbaodong@mxnavi.com> Tracing bits Acked-by: George Dunlap <george.dunlap@citrix.com. I'd appreciate if someone could ack the config bits. -George _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
On 10/06/2019 10:17, George Dunlap wrote: > On 6/10/19 2:01 AM, Baodong Chen wrote: >> Xen internal running status(trace event at pre-defined trace point) >> will be saved to trace memory when enabled. >> Trace event data and config params can be read/changed >> by system control hypercall at run time. >> >> Can be disabled for smaller code footprint. >> >> Signed-off-by: Baodong Chen <chenbaodong@mxnavi.com> > Tracing bits > > Acked-by: George Dunlap <george.dunlap@citrix.com. > > I'd appreciate if someone could ack the config bits. Ack. LGTM. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
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