linux-kernel - [RFC PATCH 09/10] fs/locks: Add tracepoint for SIGBUS on LONGTERM expiration

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Date:   Sun, 28 Apr 2019 21:53:58 -0700
From:   ira.weiny@...el.com
To:     lsf-pc@...ts.linux-foundation.org
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Dan Williams <dan.j.williams@...el.com>,
        Jan Kara <jack@...e.cz>,
        Jérôme Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Michal Hocko <mhocko@...e.com>, Ira Weiny <ira.weiny@...el.com>
Subject: [RFC PATCH 09/10] fs/locks: Add tracepoint for SIGBUS on LONGTERM expiration

From: Ira Weiny <ira.weiny@...el.com>

---
 fs/locks.c                      | 1 +
 include/trace/events/filelock.h | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/locks.c b/fs/locks.c
index c77eee081d11..42b96bfc71fa 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1592,6 +1592,7 @@ static void time_out_leases(struct inode *inode, struct list_head *dispose)
 			if (fl->fl_flags & FL_LONGTERM) {
 				tsk = find_task_by_vpid(fl->fl_pid);
 				fl->fl_break_time = 1 + jiffies + lease_break_time * HZ;
+				trace_longterm_sigbus(fl);
 				lease_modify_longterm(fl, F_UNLCK, dispose);
 				kill_pid(tsk->thread_pid, SIGBUS, 0);
 			} else {
diff --git a/include/trace/events/filelock.h b/include/trace/events/filelock.h
index c6f39f03cb8b..626386dbe599 100644
--- a/include/trace/events/filelock.h
+++ b/include/trace/events/filelock.h
@@ -271,7 +271,9 @@ DEFINE_EVENT(longterm_lease, take_longterm_lease,
 DEFINE_EVENT(longterm_lease, release_longterm_lease,
 	TP_PROTO(struct file_lock *fl),
 	TP_ARGS(fl));
-
+DEFINE_EVENT(longterm_lease, longterm_sigbus,
+	TP_PROTO(struct file_lock *fl),
+	TP_ARGS(fl));
 
 #endif /* _TRACE_FILELOCK_H */
 
-- 
2.20.1