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[v25,08/16] trace-cmd: Add guest CPU count PID in tracecmd_time_sync struct

Message ID 20201029111816.247241-9-tz.stoyanov@gmail.com (mailing list archive)
State Superseded
Headers show
Series Timestamp synchronization of host - guest tracing session | expand

Commit Message

Tzvetomir Stoyanov (VMware) Oct. 29, 2020, 11:18 a.m. UTC
The tracecmd_time_sync struct holds the timestamp synchronization
context, used by the timestamp synchronization plugins. Guest CPU count and
PID of the host task, running the guest, is important information which
may be needed by the plugins.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 include/trace-cmd/trace-cmd.h | 4 ++++
 tracecmd/trace-tsync.c        | 7 ++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)
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Patch

diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h
index 1ca2da10..9629d074 100644
--- a/include/trace-cmd/trace-cmd.h
+++ b/include/trace-cmd/trace-cmd.h
@@ -450,6 +450,10 @@  struct tracecmd_time_sync {
 	char				*clock_str;
 	struct tracecmd_msg_handle	*msg_handle;
 	void				*context;
+
+	int				guest_pid;
+	int				vcpu_count;
+
 };
 
 void tracecmd_tsync_init(void);
diff --git a/tracecmd/trace-tsync.c b/tracecmd/trace-tsync.c
index aede3754..bc5c744e 100644
--- a/tracecmd/trace-tsync.c
+++ b/tracecmd/trace-tsync.c
@@ -77,6 +77,7 @@  int tracecmd_host_tsync(struct buffer_instance *instance,
 {
 	struct tracecmd_msg_handle *msg_handle = NULL;
 	cpu_set_t *pin_mask = NULL;
+	struct trace_guest *guest;
 	pthread_attr_t attrib;
 	size_t mask_size = 0;
 	int ret;
@@ -84,7 +85,11 @@  int tracecmd_host_tsync(struct buffer_instance *instance,
 
 	if (!instance->tsync.proto_name)
 		return -1;
-
+	guest = get_guest_by_cid(instance->cid);
+	if (guest == NULL)
+		return -1;
+	instance->tsync.guest_pid = guest->pid;
+	instance->tsync.vcpu_count = guest->cpu_max;
 	fd = trace_open_vsock(instance->cid, tsync_port);
 	if (fd < 0) {
 		ret = -1;