linux-kernel - Re: [PATCH 8/8] Add VM counters for transparent hugepages

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Message-Id: <20110307172609.8A01.A69D9226@jp.fujitsu.com>
Date:	Mon,  7 Mar 2011 17:28:46 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 8/8] Add VM counters for transparent hugepages

> From: Andi Kleen <ak@...ux.intel.com>
> 
> I found it difficult to make sense of transparent huge pages without
> having any counters for its actions. Add some counters to vmstat
> for allocation of transparent hugepages and fallback to smaller
> pages.
> 
> Optional patch, but useful for development and understanding the system.
> 
> Contains improvements from Andrea Arcangeli and Johannes Weiner
> 
> Acked-by: Andrea Arcangeli <aarcange@...hat.com>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> ---
>  include/linux/vmstat.h |    7 +++++++
>  mm/huge_memory.c       |   25 +++++++++++++++++++++----
>  mm/vmstat.c            |    8 ++++++++
>  3 files changed, 36 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
> index 9b5c63d..074e8fd 100644
> --- a/include/linux/vmstat.h
> +++ b/include/linux/vmstat.h
> @@ -58,6 +58,13 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
>  		UNEVICTABLE_PGCLEARED,	/* on COW, page truncate */
>  		UNEVICTABLE_PGSTRANDED,	/* unable to isolate on unlock */
>  		UNEVICTABLE_MLOCKFREED,
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +	        THP_FAULT_ALLOC,
> +		THP_FAULT_FALLBACK,
> +		THP_COLLAPSE_ALLOC,
> +		THP_COLLAPSE_ALLOC_FAILED,
> +		THP_SPLIT,
> +#endif
>  		NR_VM_EVENT_ITEMS
>  };

Hmm...
Don't we need to make per zone stastics? I'm afraid small dma zone 
makes much thp-splitting and screw up this stastics.

only nit.


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