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perf tools: Add machine_pid and vcpu to id_index

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When injecting events from a guest perf.data file, the events will have
separate sample ID numbers. These ID numbers can then be used to determine
which machine an event belongs to. To facilitate that, add machine_pid and
vcpu to id_index records. For backward compatibility, these are added at
the end of the record, and the length of the record is used to determine
if they are present or not.

Note, this is needed because the events from a guest perf.data file contain
the pid/tid of the process running at that time inside the VM not the
pid/tid of the (QEMU) hypervisor thread. So a way is needed to relate
guest events back to the guest machine and VCPU, and using sample ID
numbers for that is relatively simple and convenient.

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/20220711093218.10967-11-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter
2022-07-11 12:31:53 +03:00
committed by Arnaldo Carvalho de Melo
parent c1fd5b7d8a
commit b47bb18661
5 changed files with 84 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
tools/lib/perf/include/internal/evsel.h
View File

@@ -30,6 +30,10 @@ struct perf_sample_id {
struct perf_cpu cpu;
pid_t tid;
/* Guest machine pid and VCPU, valid only if machine_pid is non-zero */
pid_t machine_pid;
struct perf_cpu vcpu;
/* Holds total ID period value for PERF_SAMPLE_READ processing. */
u64 period;
};

5
tools/lib/perf/include/perf/event.h
View File

@@ -237,6 +237,11 @@ struct id_index_entry {
__u64 tid;
};
struct id_index_entry_2 {
__u64 machine_pid;
__u64 vcpu;
};
struct perf_record_id_index {
struct perf_event_header header;
__u64 nr;