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So now we're ready= to merge into master?



=B7=A2=BC=FE=C8=CB: Andre= w Morton <akpm@linux-foundation.org>
=B7=A2=CB=CD=CA=B1=BC=E4: 2024=C4=EA9=D4=C227=C8=D5 4:25
=CA=D5=BC=FE=C8=CB: mm-commits@vger.kernel.org; =B8=DF=CF=E8; akpm@l= inux-foundation.org
=D6=F7=CC=E2: [External Mail]+ mm-cma-print-total-and-used-count= -in-cma_alloc.patch added to mm-unstable branch
 
[=CD=E2=B2=BF=D3=CA=BC=FE] =B4=CB=D3=CA=BC=FE=C0= =B4=D4=B4=D3=DA=D0=A1=C3=D7=B9=AB=CB=BE=CD=E2=B2=BF=A3=AC=C7=EB=BD=F7=C9=F7= =B4=A6=C0=ED=A1=A3=C8=F4=B6=D4=D3=CA=BC=FE=B0=B2=C8=AB=D0=D4=B4=E6=D2=C9=A3= =AC=C7=EB=BD=AB=D3=CA=BC=FE=D7=AA=B7=A2=B8=F8misec@xiaomi.com=BD=F8=D0=D0= =B7=B4=C0=A1

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.pat= ch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patche= s/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
Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do= a
      reply-to-all to that, adding suitable additi= onal cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing= your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
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: reserve= d, count 1, align 0)
[   24.413397] cma: cma_alloc(cma (____ptrval____), name: reserve= d, count 1, align 0)
[   24.415886] cma: cma_alloc(cma (____ptrval____), name: reserve= d, count 1, align 0)

after:
[   24.097989] cma: cma_alloc(cma (____ptrval____), name: reserve= d, total count 16384, used count: 64, request count 1, align 0)
[   24.104260] cma: cma_alloc(cma (____ptrval____), name: reserve= d, total count 16384, used count: 65, request count 1, align 0)
[   24.107504] cma: cma_alloc(cma (____ptrval____), name: reserve= d, 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 ++++++++= 3;++++--
 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->loc= k);
 }

+static unsigned long cma_get_used(struct cma *cma)
+{
+       unsigned long used;
+
+       spin_lock_irq(&cma->lock);=
+       used =3D bitmap_weight(cma->bi= tmap, (int)cma_bitmap_maxno(cma));
+       spin_unlock_irq(&cma->lock= );
+
+       return used << cma->orde= r_per_bit;
+}
+
 static struct page *__cma_alloc(struct cma *cma, unsigned long count,=
            &nb= sp;            =        unsigned int align, gfp_t gfp)
 {
@@ -420,8 +431,8 @@ static struct page *__cma_alloc(struct c
        if (!cma || !cma->count || !c= ma->bitmap)
            &nb= sp;   return page;

-       pr_debug("%s(cma %p, name: %s, c= ount %lu, align %d)\n", __func__,
-            &n= bsp;  (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__,
+           &nbs= p;   (void *)cma, cma->name, cma->count, cma_get_used(cma),= count, align);

        if (!count)
            &nb= sp;   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

--_000_e02aa8d24a254f36af5132925be4075bxiaomicom_--