Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752792AbbBLWQ6 (ORCPT ); Thu, 12 Feb 2015 17:16:58 -0500 Received: from mailout1.w1.samsung.com ([210.118.77.11]:28702 "EHLO mailout1.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752012AbbBLWQz (ORCPT ); Thu, 12 Feb 2015 17:16:55 -0500 X-AuditID: cbfec7f4-b7f126d000001e9a-c0-54dd25c45c81 From: Stefan Strogin To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Dmitry Safonov , Stefan Strogin , 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 , gregory.0xf0@gmail.com, sasha.levin@oracle.com, gioh.kim@lge.com, pavel@ucw.cz, stefan.strogin@gmail.com Subject: [PATCH 2/4] mm: cma: add functions to get region pages counters Date: Fri, 13 Feb 2015 01:15:42 +0300 Message-id: X-Mailer: git-send-email 2.1.0 In-reply-to: References: In-reply-to: References: X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuplkeLIzCtJLcpLzFFi42I5/e/4Zd0jqndDDE6v07eYs34Nm8Xj1/NY LD6tfMpm8azpC6PFtOkbWC1WdjezWWzvnMFu0TlxCbvF5V1z2CzurfnParH2yF12iwXHW1gt ln19z25x99RRNou+74fZLSbPlrL4dnIOs8XiI7eZLa7t6GeyuPzmP7vF1Bk/2C1ObjjLarGh mctB3ONyXy+Tx85Zd9k9ZnfMZPXYtKqTzWPTp0nsHl1vrzB5nJjxm8XjwaHNLB7r/rxi8vj4 9BaLx8F3e5g8+rasYvRYsfo7u8fnTXIeXRt/sQbwR3HZpKTmZJalFunbJXBlrN3RwVwwX6pi x94LbA2ML0W7GDk4JARMJP79Zepi5AQyxSQu3FvP1sXIxSEksJRR4sySXewQTi+TxNT/U8Cq 2IAajl2YzghiiwDZu5vngtnMAm1sEtcPFIPYwgIeEl/7L7GA2CwCqhIrey6wg9i8AqkSLXs7 mCG2yUls2P0frJdTwFFi59lHYHEhAQeJ2c++M+ESn8DIv4CRYRWjaGppckFxUnquoV5xYm5x aV66XnJ+7iZGSBR+2cG4+JjVIUYBDkYlHt4XuXdChFgTy4orcw8xSnAwK4nwqn8ECvGmJFZW pRblxxeV5qQWH2Jk4uCUamCMuyVgOHvLQ4fHH+YxvpTqCnjbZ8W4y/abxut9BfNverd/CKjr XX7b6PGsnHfXMiPvXF3q2jz5jEKD13bGKNGAJ2KRalkq5qGyDKrmtlUbmWRdn9i5/5VKqnkQ IWw9MfPnubT9+94t7v+0RE37yIVV+zKM7RbULJ/i2ro7fJnyYcF9GtNEq5WVWIozEg21mIuK EwFdrcqWoAIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3491 Lines: 118 From: Dmitry Safonov Here are two functions that provide interface to compute/get used size and size of biggest free chunk in cma region. Add that information to debugfs. Signed-off-by: Dmitry Safonov Signed-off-by: Stefan Strogin --- include/linux/cma.h | 2 ++ mm/cma.c | 30 ++++++++++++++++++++++++++++++ mm/cma_debug.c | 24 ++++++++++++++++++++++++ 3 files changed, 56 insertions(+) diff --git a/include/linux/cma.h b/include/linux/cma.h index 4c2c83c..54a2c4d 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 ed269b0..95e8121 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -54,6 +54,36 @@ 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; +} + +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; +} + static unsigned long cma_bitmap_aligned_mask(struct cma *cma, int align_order) { if (align_order <= cma->order_per_bit) diff --git a/mm/cma_debug.c b/mm/cma_debug.c index 5acd937..9705e86 100644 --- a/mm/cma_debug.c +++ b/mm/cma_debug.c @@ -128,6 +128,28 @@ static int cma_debugfs_get(void *data, u64 *val) DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n"); +static int cma_used_get(void *data, u64 *val) +{ + struct cma *cma = data; + + *val = cma_get_used(cma); + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(cma_used_fops, cma_used_get, NULL, "%llu\n"); + +static int cma_maxchunk_get(void *data, u64 *val) +{ + struct cma *cma = data; + + *val = cma_get_maxchunk(cma); + + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(cma_maxchunk_fops, cma_maxchunk_get, NULL, "%llu\n"); + static void cma_add_to_cma_mem_list(struct cma *cma, struct cma_mem *mem) { spin_lock(&cma->mem_head_lock); @@ -289,6 +311,8 @@ static void cma_debugfs_add_one(struct cma *cma, int idx) &cma->count, &cma_debugfs_fops); debugfs_create_file("order_per_bit", S_IRUGO, tmp, &cma->order_per_bit, &cma_debugfs_fops); + debugfs_create_file("used", S_IRUGO, tmp, cma, &cma_used_fops); + debugfs_create_file("maxchunk", S_IRUGO, tmp, cma, &cma_maxchunk_fops); debugfs_create_file("buffers", S_IRUGO, tmp, cma, &cma_buffers_fops); -- 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/