linux-kernel - [RFC PATCH 06/10] fs/locks: Add longterm lease traces

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Date:   Sun, 28 Apr 2019 21:53:55 -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 06/10] fs/locks: Add longterm lease traces

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

---
 fs/locks.c                      |  5 +++++
 include/trace/events/filelock.h | 37 ++++++++++++++++++++++++++++++++-
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/fs/locks.c b/fs/locks.c
index ae508d192223..58c6d7a411b6 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2136,6 +2136,8 @@ static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)
 	}
 	new->fa_fd = fd;
 
+	trace_take_longterm_lease(fl);
+
 	error = vfs_setlease(filp, arg, &fl, (void **)&new);
 	if (fl)
 		locks_free_lock(fl);
@@ -3118,6 +3120,8 @@ bool page_set_longterm_lease(struct page *page)
 		kref_get(&existing_fl->gup_ref);
 	}
 
+	trace_take_longterm_lease(existing_fl);
+
 	spin_unlock(&ctx->flc_lock);
 	percpu_up_read(&file_rwsem);
 
@@ -3153,6 +3157,7 @@ void page_remove_longterm_lease(struct page *page)
 	percpu_down_read(&file_rwsem);
 	spin_lock(&ctx->flc_lock);
 	found = find_longterm_lease(inode);
+	trace_release_longterm_lease(found);
 	if (found)
 		kref_put(&found->gup_ref, release_longterm_lease);
 	spin_unlock(&ctx->flc_lock);
diff --git a/include/trace/events/filelock.h b/include/trace/events/filelock.h
index 4b735923f2ff..c6f39f03cb8b 100644
--- a/include/trace/events/filelock.h
+++ b/include/trace/events/filelock.h
@@ -27,7 +27,8 @@
 		{ FL_SLEEP,		"FL_SLEEP" },			\
 		{ FL_DOWNGRADE_PENDING,	"FL_DOWNGRADE_PENDING" },	\
 		{ FL_UNLOCK_PENDING,	"FL_UNLOCK_PENDING" },		\
-		{ FL_OFDLCK,		"FL_OFDLCK" })
+		{ FL_OFDLCK,		"FL_OFDLCK" },			\
+		{ FL_LONGTERM,		"FL_LONGTERM" })
 
 #define show_fl_type(val)				\
 	__print_symbolic(val,				\
@@ -238,6 +239,40 @@ TRACE_EVENT(leases_conflict,
 		show_fl_type(__entry->b_fl_type))
 );
 
+DECLARE_EVENT_CLASS(longterm_lease,
+	TP_PROTO(struct file_lock *fl),
+
+	TP_ARGS(fl),
+
+	TP_STRUCT__entry(
+		__field(void *, fl)
+		__field(void *, owner)
+		__field(unsigned int, fl_flags)
+		__field(unsigned int, cnt)
+		__field(unsigned char, fl_type)
+	),
+
+	TP_fast_assign(
+		__entry->fl = fl;
+		__entry->owner = fl ? fl->fl_owner : NULL;
+		__entry->fl_flags = fl ? fl->fl_flags : 0;
+		__entry->cnt = fl ? kref_read(&fl->gup_ref) : 0;
+		__entry->fl_type = fl ? fl->fl_type : 0;
+	),
+
+	TP_printk("owner=0x%p fl=%p(%d) fl_flags=%s fl_type=%s",
+		__entry->owner, __entry->fl, __entry->cnt,
+		show_fl_flags(__entry->fl_flags),
+		show_fl_type(__entry->fl_type))
+);
+DEFINE_EVENT(longterm_lease, take_longterm_lease,
+	TP_PROTO(struct file_lock *fl),
+	TP_ARGS(fl));
+DEFINE_EVENT(longterm_lease, release_longterm_lease,
+	TP_PROTO(struct file_lock *fl),
+	TP_ARGS(fl));
+
+
 #endif /* _TRACE_FILELOCK_H */
 
 /* This part must be outside protection */
-- 
2.20.1