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Date: Fri, 13 Feb 2015 01:15:42 +0300 From: Stefan Strogin <s.strogin@...tner.samsung.com> To: linux-mm@...ck.org, linux-kernel@...r.kernel.org Cc: Dmitry Safonov <d.safonov@...tner.samsung.com>, Stefan Strogin <s.strogin@...tner.samsung.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>, Marek Szyprowski <m.szyprowski@...sung.com>, Michal Nazarewicz <mina86@...a86.com>, aneesh.kumar@...ux.vnet.ibm.com, Laurent Pinchart <laurent.pinchart@...asonboard.com>, Pintu Kumar <pintu.k@...sung.com>, Weijie Yang <weijie.yang@...sung.com>, Laura Abbott <lauraa@...eaurora.org>, SeongJae Park <sj38.park@...il.com>, Hui Zhu <zhuhui@...omi.com>, Minchan Kim <minchan@...nel.org>, Dyasly Sergey <s.dyasly@...sung.com>, Vyacheslav Tyrtov <v.tyrtov@...sung.com>, gregory.0xf0@...il.com, sasha.levin@...cle.com, gioh.kim@....com, pavel@....cz, stefan.strogin@...il.com Subject: [PATCH 2/4] mm: cma: add functions to get region pages counters From: Dmitry Safonov <d.safonov@...tner.samsung.com> 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 <d.safonov@...tner.samsung.com> Signed-off-by: Stefan Strogin <s.strogin@...tner.samsung.com> --- 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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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