Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751562AbaLZOkj (ORCPT ); Fri, 26 Dec 2014 09:40:39 -0500 Received: from mailout2.w1.samsung.com ([210.118.77.12]:11534 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751431AbaLZOkb (ORCPT ); Fri, 26 Dec 2014 09:40:31 -0500 X-AuditID: cbfec7f4-b7f126d000001e9a-d3-549d735c79b1 From: "Stefan I. Strogin" To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Dmitry Safonov , s.strogin@partner.samsung.com, Joonsoo Kim , Andrew Morton , Marek Szyprowski , Michal Nazarewicz , aneesh.kumar@linux.vnet.ibm.com, Laurent Pinchart , Pintu Kumar , Weijie Yang , Laura Abbott , SeongJae Park , Hui Zhu , Minchan Kim , Dyasly Sergey , Vyacheslav Tyrtov Subject: [PATCH 3/3] cma: add functions to get region pages counters Date: Fri, 26 Dec 2014 17:39:04 +0300 Message-id: X-Mailer: git-send-email 2.1.0 In-reply-to: References: In-reply-to: References: X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrNLMWRmVeSWpSXmKPExsVy+t/xK7oxxXNDDG7/MLSYs34Nm8Xj1/NY LD6tfMpmsbK7mc1ie+cMdovOiUvYLS7vmsNmcW/Nf1aLtUfuslssON7CarHs63t2i77vh9kt Js+Wsvh2cg6zxbUd/UwWU2f8YLc4ueEsq8WGZi4HIY/Lfb1MHjtn3WX3mN0xk9Vj06pONo9N nyaxe3S9vcLkcWLGbxaPB4c2s3is+/OKyePguz1MHn1bVjF6fN4k59G18RdrAG8Ul01Kak5m WWqRvl0CV8bR08vYCzYLV6z4dIq9gfEbfxcjJ4eEgInE8wsfmSBsMYkL99azdTFycQgJLGWU +HH6F5TTyyRx6PwrVpAqNgFLiWPzmsA6RIC6dzfPZQSxmQWaWSVuLeAEsYUFXCT2XP7GDGKz CKhK7LrXAWbzCqRKTPizlBFim5zEht3/wWxOAUeJJ0/Wgc0UEnCQ6Lz4hhWX+ARG/gWMDKsY RVNLkwuKk9JzDfWKE3OLS/PS9ZLzczcxQiLoyw7GxcesDjEKcDAq8fAmrJsTIsSaWFZcmXuI UYKDWUmEt8psbogQb0piZVVqUX58UWlOavEhRiYOTqkGxv5ddzI/W1d9vfavu6nB4uTtPUcC 7y+csDXuYRX764Idiww+r9wUdZQx1UZIf0eUz8JFHkoaRj9SxZ+v4wmPefjmXOTHZqHdrfPL tpYvX2p/tGx70JZNPqmlU+o5U0xMHi1f+9svKCH11zbHy5vnTTN7eHDBtf3fAx5f/HLaQlt8 +cspvC92HmJRYinOSDTUYi4qTgQABv9yzX4CAAA= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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); 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; } +unsigned long cma_get_used(struct cma *cma) +{ + unsigned long ret = 0; + + mutex_lock(&cma->lock); + /* pages counter is smaller than sizeof(int) */ + ret = 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 = 0; + unsigned long start, end = 0; + + mutex_lock(&cma->lock); + for (;;) { + start = find_next_zero_bit(cma->bitmap, cma->count, end); + if (start >= cma->count) + break; + end = find_next_bit(cma->bitmap, cma->count, start); + maxchunk = 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 <= 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; + 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); list_for_each_entry(cmabuf, &cma->buffers_list, list) { -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/