linux-kernel - Re: [PATCH 1/3] mm/page_alloc: fix a terrible misleading comment

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Message-ID: <20150824104408.GI17078@dhcp22.suse.cz>
Date:	Mon, 24 Aug 2015 12:44:08 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Yaowei Bai <bywxiaobai@....com>
Cc:	akpm@...ux-foundation.org, mgorman@...e.de, vbabka@...e.cz,
	js1304@...il.com, hannes@...xchg.org, alexander.h.duyck@...hat.com,
	sasha.levin@...cle.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mm/page_alloc: fix a terrible misleading comment

On Sat 22-08-15 15:40:10, Yaowei Bai wrote:
> The comment says that the per-cpu batchsize and zone watermarks
> are determined by present_pages which is definitely wrong, they
> are both calculated from managed_pages. Fix it.

This seems to be missed in b40da04946aa ("mm: use zone->present_pages
instead of zone->managed_pages where appropriate")
> 
> Signed-off-by: Yaowei Bai <bywxiaobai@....com>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  mm/page_alloc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 5b5240b..c22b133 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6003,7 +6003,7 @@ void __init mem_init_print_info(const char *str)
>   * set_dma_reserve - set the specified number of pages reserved in the first zone
>   * @new_dma_reserve: The number of pages to mark reserved
>   *
> - * The per-cpu batchsize and zone watermarks are determined by present_pages.
> + * The per-cpu batchsize and zone watermarks are determined by managed_pages.
>   * In the DMA zone, a significant percentage may be consumed by kernel image
>   * and other unfreeable allocations which can skew the watermarks badly. This
>   * function may optionally be used to account for unfreeable pages in the
> -- 
> 1.9.1
> 
> 
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-- 
Michal Hocko
SUSE Labs
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