The patch titled
Subject: mm/cma: print total and used count in cma_alloc()
has been added to the -mm mm-unstable branch. Its filename is
mm-cma-print-total-and-used-count-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-count-in-cma_alloc.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: gaoxiang17 <gaoxiang17@xxxxxxxxxx>
Subject: mm/cma: print total and used count in cma_alloc()
Date: Thu, 26 Sep 2024 20:00:49 +0800
To better understand cma area 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:
[ 24.097989] cma: cma_alloc(cma (____ptrval____), name: reserved, total count 16384, used count: 64, request count 1, align 0)
[ 24.104260] cma: cma_alloc(cma (____ptrval____), name: reserved, total count 16384, used count: 65, request count 1, align 0)
[ 24.107504] cma: cma_alloc(cma (____ptrval____), name: reserved, total count 16384, used count: 66, request count 1, align 0)
Link: https://lkml.kernel.org/r/20240926120049.321514-1-gxxa03070307@xxxxxxxxx
Signed-off-by: gaoxiang17 <gaoxiang17@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/cma.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
--- a/mm/cma.c~mm-cma-print-total-and-used-count-in-cma_alloc
+++ a/mm/cma.c
@@ -403,6 +403,17 @@ static void cma_debug_show_areas(struct
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 used << cma->order_per_bit;
+}
+
static struct page *__cma_alloc(struct cma *cma, unsigned long count,
unsigned int align, gfp_t gfp)
{
@@ -420,8 +431,8 @@ static struct page *__cma_alloc(struct c
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;
_
Patches currently in -mm which might be from gaoxiang17@xxxxxxxxxx are
mm-cma-print-total-and-used-count-in-cma_alloc.patch
