linux-kernel - Re: [PATCH] mm: cma: add trace events for CMA allocations and freeings

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Date:	Thu, 2 Apr 2015 16:33:41 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Stefan Strogin <s.strogin@...tner.samsung.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.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>,
	Sasha Levin <sasha.levin@...cle.com>,
	Dmitry Safonov <d.safonov@...tner.samsung.com>,
	Pintu Kumar <pintu.k@...sung.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Dyasly Sergey <s.dyasly@...sung.com>,
	Vyacheslav Tyrtov <v.tyrtov@...sung.com>,
	Aleksei Mateosian <a.mateosian@...sung.com>, gioh.kim@....com,
	stefan.strogin@...il.com
Subject: Re: [PATCH] mm: cma: add trace events for CMA allocations and
 freeings

Hello,

On Wed, Apr 01, 2015 at 04:31:43PM +0300, Stefan Strogin wrote:
> Add trace events for cma_alloc() and cma_release().
> 
> The cma_alloc tracepoint is used both for successful and failed allocations,
> in case of allocation failure pfn=-1UL is stored and printed.
> 
> Signed-off-by: Stefan Strogin <stefan.strogin@...il.com>
> ---
> 
> Took out from the patch set "mm: cma: add some debug information for CMA" v4
> (http://thread.gmane.org/gmane.linux.kernel.mm/129903) because of probable
> uselessness of the rest of the patches.

I think that patch 5/5 in previous submission is handy and
simple to merge. Although we can calculate it by using bitmap,
it would be good to get that information(used size and maxchunk size)
directly.


> @@ -414,6 +416,8 @@ struct page *cma_alloc(struct cma *cma, unsigned int count, unsigned int align)
>  		start = bitmap_no + mask + 1;
>  	}
>  
> +	trace_cma_alloc(page ? pfn : -1UL, page, count);
> +

I think that tracing align is also useful.
Is there any reason not to include it?

Thanks.

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