+ mm-cma-print-total-and-used-pages-in-cma_alloc.patch added to mm-new branch

+ mm-cma-print-total-and-used-pages-in-cma_alloc.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/cma: print total and used pages in cma_alloc()
has been added to the -mm mm-new branch.  Its filename is
     mm-cma-print-total-and-used-pages-in-cma_alloc.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-cma-print-total-and-used-pages-in-cma_alloc.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
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------------------------------------------------------
From: Xiang Gao <gxxa03070307@gmail.com>
Subject: mm/cma: print total and used pages in cma_alloc()
Date: Sat, 16 Aug 2025 12:28:42 +0800


This makes cma info more intuitive during debugging.

before:
[   24.407814] cma: cma_alloc(cma (____ptrval____), name: reserved, count 1, align 0)
[   24.413397] cma: cma_alloc(cma (____ptrval____), name: reserved, count 1, align 0)
[   24.415886] cma: cma_alloc(cma (____ptrval____), name: reserved, count 1, align 0)

after:
[   24.069738] cma: cma_alloc(cma (____ptrval____), name: reserved, total pages: 16384, used pages: 64, request pages: 1, align 0)
[   24.075317] cma: cma_alloc(cma (____ptrval____), name: reserved, total pages: 16384, used pages: 65, request pages: 1, align 0)
[   24.078455] cma: cma_alloc(cma (____ptrval____), name: reserved, total pages: 16384, used pages: 66, request pages: 1, align 0)

Link: https://lkml.kernel.org/r/20250816042842.3959315-1-gxxa03070307@gmail.com
Signed-off-by: gaoxiang17 <gaoxiang17@xiaomi.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/cma.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

--- a/mm/cma.c~mm-cma-print-total-and-used-pages-in-cma_alloc
+++ a/mm/cma.c
@@ -776,6 +776,17 @@ static void cma_debug_show_areas(struct
 	spin_unlock_irq(&cma->lock);
 }
 
+static unsigned long cma_get_used_pages(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 used << cma->order_per_bit;
+}
+
 static int cma_range_alloc(struct cma *cma, struct cma_memrange *cmr,
 				unsigned long count, unsigned int align,
 				struct page **pagep, gfp_t gfp)
@@ -858,8 +869,8 @@ static struct page *__cma_alloc(struct c
 	if (!cma || !cma->count)
 		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 pages: %lu, used pages: %lu, request pages: %lu, align %d)\n",
+		__func__, (void *)cma, cma->name, cma->count, cma_get_used_pages(cma), count, align);
 
 	if (!count)
 		return page;
_

Patches currently in -mm which might be from gxxa03070307@gmail.com are

mm-cma-print-total-and-used-pages-in-cma_alloc.patch