perf tools: Add guest_cpu to hypervisor threads

It is possible to know which guest machine was running at a point in time
based on the PID of the currently running host thread. That is, perf
identifies guest machines by the PID of the hypervisor.

To determine the guest CPU, put it on the hypervisor (QEMU) thread for
that VCPU.

This is done when processing the id_index which provides the necessary
information.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-13-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

This commit is contained in:

Adrian Hunter

2022-07-11 12:31:55 +03:00

committed by

Arnaldo Carvalho de Melo

parent ff7a78c210

commit 797efbc523

3 changed files with 20 additions and 0 deletions

									
										tools/perf/util/thread.h
									
		+1
		
												View File
												
				@@ -39,6 +39,7 @@ struct thread {

					pid_t			tid;

					pid_t			ppid;

					int			cpu;

					int			guest_cpu; /* For QEMU thread */

					refcount_t		refcnt;

					bool			comm_set;

					int			comm_len;