linux-kernel - Re: [PATCH] kmemcheck: add scheduling point to kmemleak

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Date:   Fri, 17 Nov 2017 18:27:22 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Yisheng Xie <xieyisheng1@...wei.com>
Cc:     akpm@...ux-foundation.org, mhocko@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kmemcheck: add scheduling point to kmemleak_scan

Please fix the subject as the tool is called "kmemleak" rather than
"kmemcheck".

On Fri, Nov 17, 2017 at 03:03:56PM +0800, Yisheng Xie wrote:
> diff --git a/mm/kmemleak.c b/mm/kmemleak.c
> index e4738d5..e9f2e86 100644
> --- a/mm/kmemleak.c
> +++ b/mm/kmemleak.c
> @@ -1523,6 +1523,8 @@ static void kmemleak_scan(void)
>  			if (page_count(page) == 0)
>  				continue;
>  			scan_block(page, page + 1, NULL);
> +			if (!(pfn % 1024))
> +				cond_resched();

For consistency with the other places where we call cond_resched() in
kmemleak, I would use MAX_SCAN_SIZE. Something like

			if (!(pfn % (MAX_SCAN_SIZE / sizeof(page))))
				cont_resched();

Thanks.

-- 
Catalin