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Fri, 15 Aug 2025 21:28:50 -0700 (PDT) Received: from bj-kjy-standalone-gaoxiang17.mioffice.cn ([43.224.245.244]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b472d73a418sm2611958a12.38.2025.08.15.21.28.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Aug 2025 21:28:49 -0700 (PDT) From: Xiang Gao To: akpm@linux-foundation.org, david@redhat.com Cc: lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, gaoxiang17 Subject: [PATCH] mm/cma: print total and used pages in cma_alloc() Date: Sat, 16 Aug 2025 12:28:42 +0800 Message-Id: <20250816042842.3959315-1-gxxa03070307@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: gaoxiang17 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 p= ages: 16384, used pages: 64, request pages: 1, align 0) [ 24.075317] cma: cma_alloc(cma (____ptrval____), name: reserved, total p= ages: 16384, used pages: 65, request pages: 1, align 0) [ 24.078455] cma: cma_alloc(cma (____ptrval____), name: reserved, total p= ages: 16384, used pages: 66, request pages: 1, align 0) Signed-off-by: gaoxiang17 --- mm/cma.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/mm/cma.c b/mm/cma.c index 2ffa4befb99a..46cc98e7f587 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -776,6 +776,17 @@ static void cma_debug_show_areas(struct cma *cma) spin_unlock_irq(&cma->lock); } =20 +static unsigned long cma_get_used_pages(struct cma *cma) +{ + unsigned long used; + + spin_lock_irq(&cma->lock); + used =3D 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 cma *cma, unsign= ed long count, if (!cma || !cma->count) return page; =20 - 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), c= ount, align); =20 if (!count) return page; --=20 2.34.1