From 3812d2987733c5a00e103be4e23d63ec9342043a Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Fri, 10 Jun 2022 14:33:15 +0300 Subject: perf record: Add finished init event In preparation for recording sideband events in a virtual machine guest so that they can be injected into a host perf.data file. This is needed to enable injecting events after the initial synthesized user events (that have an all zero id sample) but before regular events. Committer notes: Add entry about PERF_RECORD_FINISHED_INIT to tools/perf/Documentation/perf.data-file-format.txt. Committer testing: Before: # perf report -D | grep FINISHED 0 0x5910 [0x8]: PERF_RECORD_FINISHED_ROUND FINISHED_ROUND events: 1 ( 0.5%) # After: # perf record -- sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.020 MB perf.data (7 samples) ] # perf report -D | grep FINISHED 0 0x5068 [0x8]: PERF_RECORD_FINISHED_INIT: unhandled! 0 0x5390 [0x8]: PERF_RECORD_FINISHED_ROUND FINISHED_ROUND events: 1 ( 0.5%) FINISHED_INIT events: 1 ( 0.5%) # Signed-off-by: Adrian Hunter Acked-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lore.kernel.org/r/20220610113316.6682-5-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/session.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'tools/perf/util/session.c') diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 0aa818977d2b..37f833c3c81b 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -562,6 +562,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool) tool->feature = process_event_op2_stub; if (tool->compressed == NULL) tool->compressed = perf_session__process_compressed_event; + if (tool->finished_init == NULL) + tool->finished_init = process_event_op2_stub; } static void swap_sample_id_all(union perf_event *event, void *data) @@ -1706,6 +1708,8 @@ static s64 perf_session__process_user_event(struct perf_session *session, if (err) dump_event(session->evlist, event, file_offset, &sample, file_path); return err; + case PERF_RECORD_FINISHED_INIT: + return tool->finished_init(session, event); default: return -EINVAL; } -- cgit v1.2.3-59-g8ed1b