linux-kernel - [PATCH 3/5] perf record: Change evlist->ctl_fd to use fdarray_flag__non_perf

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Date:   Wed, 24 Aug 2022 10:28:12 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] perf record: Change evlist->ctl_fd to use fdarray_flag__non_perf_event

Patch "perf record: Fix way of handling non-perf-event pollfds" added a
generic way to handle non-perf-event file descriptors like evlist->ctl_fd.
Use it instead of handling evlist->ctl_fd separately.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/builtin-record.c | 15 +--------------
 tools/perf/util/evlist.c    | 19 ++-----------------
 tools/perf/util/evlist.h    |  1 -
 3 files changed, 3 insertions(+), 32 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e0be48c47f65..cefb3028f565 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1198,18 +1198,7 @@ static int record__alloc_thread_data(struct record *rec, struct evlist *evlist)
 			if (ret < 0)
 				goto out_free;
 
-			if (evlist->ctl_fd.pos == -1)
-				continue;
-			ret = fdarray__dup_entry_from(&thread_data[t].pollfd, evlist->ctl_fd.pos,
-						      &evlist->core.pollfd);
-			if (ret < 0) {
-				pr_err("Failed to duplicate descriptor in main thread pollfd\n");
-				goto out_free;
-			}
-			thread_data[t].ctlfd_pos = ret;
-			pr_debug2("thread_data[%p]: pollfd[%d] <- ctl_fd=%d\n",
-				 thread_data, thread_data[t].ctlfd_pos,
-				 evlist->core.pollfd.entries[evlist->ctl_fd.pos].fd);
+			thread_data[t].ctlfd_pos = -1; /* Not used */
 		}
 	}
 
@@ -2610,8 +2599,6 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 			err = record__update_evlist_pollfd_from_thread(rec, rec->evlist, thread);
 			if (err)
 				goto out_child;
-			evlist__ctlfd_update(rec->evlist,
-				&thread->pollfd.entries[thread->ctlfd_pos]);
 		}
 
 		if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 0b2222d05577..4c5e6e9f8d11 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1898,7 +1898,8 @@ int evlist__initialize_ctlfd(struct evlist *evlist, int fd, int ack)
 	}
 
 	evlist->ctl_fd.pos = perf_evlist__add_pollfd(&evlist->core, fd, NULL, POLLIN,
-						     fdarray_flag__nonfilterable);
+						     fdarray_flag__nonfilterable |
+						     fdarray_flag__non_perf_event);
 	if (evlist->ctl_fd.pos < 0) {
 		evlist->ctl_fd.pos = -1;
 		pr_err("Failed to add ctl fd entry: %m\n");
@@ -2148,22 +2149,6 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
 	return err;
 }
 
-int evlist__ctlfd_update(struct evlist *evlist, struct pollfd *update)
-{
-	int ctlfd_pos = evlist->ctl_fd.pos;
-	struct pollfd *entries = evlist->core.pollfd.entries;
-
-	if (!evlist__ctlfd_initialized(evlist))
-		return 0;
-
-	if (entries[ctlfd_pos].fd != update->fd ||
-	    entries[ctlfd_pos].events != update->events)
-		return -1;
-
-	entries[ctlfd_pos].revents = update->revents;
-	return 0;
-}
-
 struct evsel *evlist__find_evsel(struct evlist *evlist, int idx)
 {
 	struct evsel *evsel;
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 351ba2887a79..3a464585d397 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -418,7 +418,6 @@ void evlist__close_control(int ctl_fd, int ctl_fd_ack, bool *ctl_fd_close);
 int evlist__initialize_ctlfd(struct evlist *evlist, int ctl_fd, int ctl_fd_ack);
 int evlist__finalize_ctlfd(struct evlist *evlist);
 bool evlist__ctlfd_initialized(struct evlist *evlist);
-int evlist__ctlfd_update(struct evlist *evlist, struct pollfd *update);
 int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd);
 int evlist__ctlfd_ack(struct evlist *evlist);
 
-- 
2.25.1