From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f173.google.com (mail-wi0-f173.google.com [209.85.212.173]) by kanga.kvack.org (Postfix) with ESMTP id 14B4D6B0071 for ; Fri, 26 Dec 2014 11:10:52 -0500 (EST) Received: by mail-wi0-f173.google.com with SMTP id r20so17337507wiv.6 for ; Fri, 26 Dec 2014 08:10:51 -0800 (PST) Received: from mail-wg0-x22e.google.com (mail-wg0-x22e.google.com. [2a00:1450:400c:c00::22e]) by mx.google.com with ESMTPS id i17si43101980wiv.21.2014.12.26.08.10.51 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 26 Dec 2014 08:10:51 -0800 (PST) Received: by mail-wg0-f46.google.com with SMTP id x13so14656550wgg.19 for ; Fri, 26 Dec 2014 08:10:51 -0800 (PST) From: Michal Nazarewicz Subject: Re: [PATCH 3/3] cma: add functions to get region pages counters In-Reply-To: References: Date: Fri, 26 Dec 2014 17:10:47 +0100 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org List-ID: To: "Stefan I. Strogin" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Dmitry Safonov , Joonsoo Kim , Andrew Morton , Marek Szyprowski , aneesh.kumar@linux.vnet.ibm.com, Laurent Pinchart , Pintu Kumar , Weijie Yang , Laura Abbott , SeongJae Park , Hui Zhu , Minchan Kim , Dyasly Sergey , Vyacheslav Tyrtov On Fri, Dec 26 2014, "Stefan I. Strogin" wr= ote: > From: Dmitry Safonov > > Here are two functions that provide interface to compute/get used size > and size of biggest free chunk in cma region. > Added that information in cmainfo. > > Signed-off-by: Dmitry Safonov Acked-by: Michal Nazarewicz > --- > include/linux/cma.h | 2 ++ > mm/cma.c | 34 ++++++++++++++++++++++++++++++++++ > 2 files changed, 36 insertions(+) > > diff --git a/include/linux/cma.h b/include/linux/cma.h > index 9384ba6..855e6f2 100644 > --- a/include/linux/cma.h > +++ b/include/linux/cma.h > @@ -18,6 +18,8 @@ struct cma; > extern unsigned long totalcma_pages; > extern phys_addr_t cma_get_base(struct cma *cma); > extern unsigned long cma_get_size(struct cma *cma); > +extern unsigned long cma_get_used(struct cma *cma); > +extern unsigned long cma_get_maxchunk(struct cma *cma); >=20=20 > extern int __init cma_declare_contiguous(phys_addr_t base, > phys_addr_t size, phys_addr_t limit, > diff --git a/mm/cma.c b/mm/cma.c > index ffaea26..5e560ed 100644 > --- a/mm/cma.c > +++ b/mm/cma.c > @@ -78,6 +78,36 @@ unsigned long cma_get_size(struct cma *cma) > return cma->count << PAGE_SHIFT; > } >=20=20 > +unsigned long cma_get_used(struct cma *cma) > +{ > + unsigned long ret =3D 0; > + > + mutex_lock(&cma->lock); > + /* pages counter is smaller than sizeof(int) */ > + ret =3D bitmap_weight(cma->bitmap, (int)cma->count); > + mutex_unlock(&cma->lock); > + > + return ret << (PAGE_SHIFT + cma->order_per_bit); > +} > + > +unsigned long cma_get_maxchunk(struct cma *cma) > +{ > + unsigned long maxchunk =3D 0; > + unsigned long start, end =3D 0; > + > + mutex_lock(&cma->lock); > + for (;;) { > + start =3D find_next_zero_bit(cma->bitmap, cma->count, end); > + if (start >=3D cma->count) > + break; > + end =3D find_next_bit(cma->bitmap, cma->count, start); > + maxchunk =3D max(end - start, maxchunk); > + } > + mutex_unlock(&cma->lock); > + > + return maxchunk << (PAGE_SHIFT + cma->order_per_bit); > +} > + > static unsigned long cma_bitmap_aligned_mask(struct cma *cma, int align_= order) > { > if (align_order <=3D cma->order_per_bit) > @@ -591,6 +621,10 @@ static int s_show(struct seq_file *m, void *p) > struct cma_buffer *cmabuf; > struct stack_trace trace; >=20=20 > + seq_printf(m, "CMARegion stat: %8lu kB total, %8lu kB used, %8lu kB max= contiguous chunk\n\n", > + cma_get_size(cma) >> 10, > + cma_get_used(cma) >> 10, > + cma_get_maxchunk(cma) >> 10); > mutex_lock(&cma->list_lock); >=20=20 > list_for_each_entry(cmabuf, &cma->buffers_list, list) { > --=20 > 2.1.0 > --=20 Best regards, _ _ .o. | Liege of Serenely Enlightened Majesty of o' \,=3D./ `o ..o | Computer Science, Micha=C5=82 =E2=80=9Cmina86=E2=80=9D Nazarewicz = (o o) ooo +------ooO--(_)--Ooo-- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org