linux-kernel - Re: [PATCH] CMA: add the amount of cma memory in meminfo

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Date:	Thu, 04 Dec 2014 17:26:29 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Xishi Qiu <qiuxishi@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	m.szyprowski@...sung.com, aneesh.kumar@...ux.vnet.ibm.com,
	iamjoonsoo.kim@....com
Cc:	LKML <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
	Xishi Qiu <qiuxishi@...wei.com>
Subject: Re: [PATCH] CMA: add the amount of cma memory in meminfo

On Thu, Dec 04 2014, Xishi Qiu <qiuxishi@...wei.com> wrote:
> Add the amount of cma memory in the following meminfo.
> /proc/meminfo
> /sys/devices/system/node/nodeXX/meminfo
>
> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
> ---
>  drivers/base/node.c | 16 ++++++++++------
>  fs/proc/meminfo.c   | 12 +++++++++---
>  2 files changed, 19 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index 472168c..a27e4e0 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -120,6 +120,9 @@ static ssize_t node_read_meminfo(struct device *dev,
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  		       "Node %d AnonHugePages:  %8lu kB\n"
>  #endif
> +#ifdef CONFIG_CMA
> +		       "Node %d FreeCMAPages:   %8lu kB\n"
> +#endif
>  			,
>  		       nid, K(node_page_state(nid, NR_FILE_DIRTY)),
>  		       nid, K(node_page_state(nid, NR_WRITEBACK)),
> @@ -136,14 +139,15 @@ static ssize_t node_read_meminfo(struct device *dev,
>  		       nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
>  				node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
>  		       nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  		       nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))

Why is this line suddenly out of “#ifdef CONFIG_TRANSPARENT_HUGEPAGE”?

> -			, nid,
> -			K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) *
> -			HPAGE_PMD_NR));
> -#else
> -		       nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +		       , nid, K(node_page_state(nid,
> +				NR_ANON_TRANSPARENT_HUGEPAGES) * HPAGE_PMD_NR)

This is mere white-space change which is confusing.

> +#endif
> +#ifdef CONFIG_CMA
> +		       , nid, K(node_page_state(nid, NR_FREE_CMA_PAGES))
>  #endif
> +			);
>  	n += hugetlb_report_node_meminfo(nid, buf + n);
>  	return n;
>  }
> diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
> index aa1eee0..d42e082 100644
> --- a/fs/proc/meminfo.c
> +++ b/fs/proc/meminfo.c
> @@ -138,6 +138,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  		"AnonHugePages:  %8lu kB\n"
>  #endif
> +#ifdef CONFIG_CMA
> +		"FreeCMAPages:   %8lu kB\n"
> +#endif
>  		,
>  		K(i.totalram),
>  		K(i.freeram),
> @@ -187,11 +190,14 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
>  		vmi.used >> 10,
>  		vmi.largest_chunk >> 10
>  #ifdef CONFIG_MEMORY_FAILURE
> -		,atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
> +		, atomic_long_read(&num_poisoned_pages) << (PAGE_SHIFT - 10)
>  #endif
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
> -		,K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
> -		   HPAGE_PMD_NR)
> +		, K(global_page_state(NR_ANON_TRANSPARENT_HUGEPAGES) *
> +				HPAGE_PMD_NR)
> +#endif

Again, please don't include white space changes.  They are confusing.

> +#ifdef CONFIG_CMA
> +		, K(global_page_state(NR_FREE_CMA_PAGES))
>  #endif
>  		);
>  
> -- 
> 2.0.0
>
>

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +--<mpn@...gle.com>--<xmpp:mina86@...ber.org>--ooO--(_)--Ooo--
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