linux-kernel - [PATCH v2 4/7] mm: vmalloc: Use trace_alloc_vmap

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Message-Id: <20221018181053.434508-5-urezki@gmail.com>
Date:   Tue, 18 Oct 2022 20:10:50 +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>,
        Steven Rostedt <rostedt@...dmis.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: [PATCH v2 4/7] mm: vmalloc: Use trace_alloc_vmap_area event

This is for debug purpose and is called when an allocation
attempt occurs. This event gives some information about:
- a start address of allocated area;
- a size that is requested;
- an align that is required;
- vstart/vend restriction;
- if an allocation fails.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 mm/vmalloc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 83b54beb12fa..aa86f21bfad0 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -43,6 +43,9 @@
 #include <asm/tlbflush.h>
 #include <asm/shmparam.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/vmalloc.h>
+
 #include "internal.h"
 #include "pgalloc-track.h"
 
@@ -1621,6 +1624,8 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
 		size, align, vstart, vend);
 	spin_unlock(&free_vmap_area_lock);
 
+	trace_alloc_vmap_area(addr, size, align, vstart, vend, addr == vend);
+
 	/*
 	 * If an allocation fails, the "vend" address is
 	 * returned. Therefore trigger the overflow path.
-- 
2.30.2