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Date: Sat, 27 Dec 2014 16:18:14 +0900 (KST) From: SeongJae Park <sj38.park@...il.com> To: "Stefan I. Strogin" <s.strogin@...tner.samsung.com> cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Dmitry Safonov <d.safonov@...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> Subject: Re: [PATCH 3/3] cma: add functions to get region pages counters Hello, On Fri, 26 Dec 2014, Stefan I. Strogin wrote: > 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. > Added that information in cmainfo. > > Signed-off-by: Dmitry Safonov <d.safonov@...tner.samsung.com> > --- > 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", How about 'CMA Region' rather than 'CMARegion'? > + 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@...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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