答复: [External Mail]+ mm-cma-print-total-and-used-count-in-cma_alloc.patch added to mm-unstable branch

[高翔 <gaoxiang17@xiaomi.com>]

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So now we're ready to merge into master?


________________________________
发件人: Andrew Morton <akpm@linux-foundation.org>
发送时间: 2024年9月27日 4:25
收件人: mm-commits@vger.kernel.org; 高翔; akpm@linux-foundation.org
主题: [External Mail]+ mm-cma-print-total-and-used-count-in-cma_alloc.patch added to mm-unstable branch

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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@xiaomi.com>
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@gmail.com
Signed-off-by: gaoxiang17 <gaoxiang17@xiaomi.com>
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-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@xiaomi.com are

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


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