linux-kernel - Re: [PATCHv5 10/28] mm, vmstats: new THP splitting event

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Date:	Fri, 15 May 2015 15:10:21 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>
CC:	Dave Hansen <dave.hansen@...el.com>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Steve Capper <steve.capper@...aro.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Jerome Marchand <jmarchan@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv5 10/28] mm, vmstats: new THP splitting event

On 04/23/2015 11:03 PM, Kirill A. Shutemov wrote:
> The patch replaces THP_SPLIT with tree events: THP_SPLIT_PAGE,
> THP_SPLIT_PAGE_FAILT and THP_SPLIT_PMD. It reflects the fact that we
> are going to be able split PMD without the compound page and that
> split_huge_page() can fail.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Acked-by: Christoph Lameter <cl@...ux.com>
> Tested-by: Sasha Levin <sasha.levin@...cle.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>   include/linux/vm_event_item.h | 4 +++-
>   mm/huge_memory.c              | 2 +-
>   mm/vmstat.c                   | 4 +++-
>   3 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
> index 2b1cef88b827..3261bfe2156a 100644
> --- a/include/linux/vm_event_item.h
> +++ b/include/linux/vm_event_item.h
> @@ -69,7 +69,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
>   		THP_FAULT_FALLBACK,
>   		THP_COLLAPSE_ALLOC,
>   		THP_COLLAPSE_ALLOC_FAILED,
> -		THP_SPLIT,
> +		THP_SPLIT_PAGE,
> +		THP_SPLIT_PAGE_FAILED,
> +		THP_SPLIT_PMD,
>   		THP_ZERO_PAGE_ALLOC,
>   		THP_ZERO_PAGE_ALLOC_FAILED,
>   #endif
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index ccbfacf07160..be6d0e0f5050 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -1961,7 +1961,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
>
>   	BUG_ON(!PageSwapBacked(page));
>   	__split_huge_page(page, anon_vma, list);
> -	count_vm_event(THP_SPLIT);
> +	count_vm_event(THP_SPLIT_PAGE);
>
>   	BUG_ON(PageCompound(page));
>   out_unlock:
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 1fd0886a389f..e1c87425fe11 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -821,7 +821,9 @@ const char * const vmstat_text[] = {
>   	"thp_fault_fallback",
>   	"thp_collapse_alloc",
>   	"thp_collapse_alloc_failed",
> -	"thp_split",
> +	"thp_split_page",
> +	"thp_split_page_failed",
> +	"thp_split_pmd",
>   	"thp_zero_page_alloc",
>   	"thp_zero_page_alloc_failed",
>   #endif
>

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