linux-kernel - [PATCH] mm/cma.c: To better understand cma area during debugging, add total and used count logs to in cma

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Message-Id: <20240918124325.109236-1-gxxa03070307@gmail.com>
Date: Wed, 18 Sep 2024 20:43:25 +0800
From: Xiang Gao <gxxa03070307@...il.com>
To: akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	gaoxiang17 <gaoxiang17@...omi.com>
Subject: [PATCH] mm/cma.c: To better understand cma area during debugging, add total and used count logs to in cma_alloc

From: gaoxiang17 <gaoxiang17@...omi.com>

[   24.225125] cma: cma_alloc(cma (____ptrval____), name: reserved, total count 16384, used count: 64, request count 1, align 0)
[   24.231963] cma: cma_alloc(cma (____ptrval____), name: reserved, total count 16384, used count: 65, request count 1, align 0)
[   24.235712] cma: cma_alloc(cma (____ptrval____), name: reserved, total count 16384, used count: 66, request count 1, align 0)

Signed-off-by: gaoxiang17 <gaoxiang17@...omi.com>
---
 mm/cma.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/mm/cma.c b/mm/cma.c
index 3e9724716bad..cceff3b6a79e 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -403,6 +403,17 @@ static void cma_debug_show_areas(struct cma *cma)
 	spin_unlock_irq(&cma->lock);
 }
 
+static unsigned long cma_get_used(struct cma *cma)
+{
+	unsigned long used;
+
+	spin_lock_irq(&cma->lock);
+	used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma));
+	spin_unlock_irq(&cma->lock);
+
+	return (unsigned long)used << cma->order_per_bit;
+}
+
 /**
  * cma_alloc() - allocate pages from contiguous area
  * @cma:   Contiguous memory region for which the allocation is performed.
@@ -430,8 +441,8 @@ struct page *cma_alloc(struct cma *cma, unsigned long count,
 	if (!cma || !cma->count || !cma->bitmap)
 		return page;
 
-	pr_debug("%s(cma %p, name: %s, count %lu, align %d)\n", __func__,
-		(void *)cma, cma->name, count, align);
+	pr_debug("%s(cma %p, name: %s, total count %lu, used count: %lu, request count %lu, align %d)\n", __func__,
+		(void *)cma, cma->name, cma->count, cma_get_used(cma), count, align);
 
 	if (!count)
 		return page;
-- 
2.34.1