linux-kernel - [PATCH 2/7] mm: vmap: Add a purge_vmap_area

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Date:   Mon, 17 Oct 2022 18:02:26 +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 2/7] mm: vmap: Add a purge_vmap_area_lazy trace event

It is for debug purpose to track number of freed vmaps
including a range it occurs on.

To: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 include/trace/events/vmap.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/include/trace/events/vmap.h b/include/trace/events/vmap.h
index 504870d95a4e..2af2b84c6eb7 100644
--- a/include/trace/events/vmap.h
+++ b/include/trace/events/vmap.h
@@ -50,6 +50,39 @@ TRACE_EVENT(alloc_vmap_area,
 		__entry->vstart, __entry->vend, __entry->failed)
 );
 
+/**
+ * purge_vmap_area_lazy - called when vmap areas were lazily freed
+ * @start:		purging start address
+ * @end:		purging end address
+ * @npurged:	numbed of purged vmap areas
+ *
+ * This event is used for a debug purpose. It gives some
+ * indication about start:end range and how many objects
+ * are released.
+ */
+TRACE_EVENT(purge_vmap_area_lazy,
+
+	TP_PROTO(unsigned long start, unsigned long end,
+		unsigned int npurged),
+
+	TP_ARGS(start, end, npurged),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, start)
+		__field(unsigned long, end)
+		__field(unsigned int, npurged)
+	),
+
+	TP_fast_assign(
+		__entry->start = start;
+		__entry->end = end;
+		__entry->npurged = npurged;
+	),
+
+	TP_printk("start=0x%lx end=0x%lx num_purged=%u",
+		__entry->start, __entry->end, __entry->npurged)
+);
+
 #endif /*  _TRACE_VMAP_H */
 
 /* This part must be outside protection */
-- 
2.30.2