linux-kernel - [PATCH 3/7] mm: vmap: Add free_vmap_area

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Date:   Mon, 17 Oct 2022 18:02:29 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: [PATCH 3/7] mm: vmap: Add free_vmap_area_noflush trace event

This event is used in order to validate/debug a start address
of freed VA, number of currently outstanding and maximum allowed
areas.

To: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 include/trace/events/vmap.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/include/trace/events/vmap.h b/include/trace/events/vmap.h
index 2af2b84c6eb7..5ba9bf58772a 100644
--- a/include/trace/events/vmap.h
+++ b/include/trace/events/vmap.h
@@ -83,6 +83,40 @@ TRACE_EVENT(purge_vmap_area_lazy,
 		__entry->start, __entry->end, __entry->npurged)
 );
 
+/**
+ * free_vmap_area_noflush - called when a vmap area is freed
+ * @va_start:		a start address of VA
+ * @nr_lazy:		number of current lazy pages
+ * @nr_lazy_max:	number of maximum lazy pages
+ *
+ * This event is used for a debug purpose. It gives some
+ * indication about a VA that is released, number of current
+ * outstanding areas and a maximum allowed threshold before
+ * dropping all of them.
+ */
+TRACE_EVENT(free_vmap_area_noflush,
+
+	TP_PROTO(unsigned long va_start, unsigned long nr_lazy,
+		unsigned long nr_lazy_max),
+
+	TP_ARGS(va_start, nr_lazy, nr_lazy_max),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, va_start)
+		__field(unsigned long, nr_lazy)
+		__field(unsigned long, nr_lazy_max)
+	),
+
+	TP_fast_assign(
+		__entry->va_start = va_start;
+		__entry->nr_lazy = nr_lazy;
+		__entry->nr_lazy_max = nr_lazy_max;
+	),
+
+	TP_printk("va_start=0x%lx nr_lazy=%lu nr_lazy_max=%lu",
+		__entry->va_start, __entry->nr_lazy, __entry->nr_lazy_max)
+);
+
 #endif /*  _TRACE_VMAP_H */
 
 /* This part must be outside protection */
-- 
2.30.2