linux-kernel - Re: [PATCH] bcache: add cond_resched() in __bch_cache

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Message-ID: <24916a71-39ff-7324-ad12-9d79cc68d0da@suse.de>
Date:   Thu, 7 Mar 2019 18:34:16 +0800
From:   Coly Li <colyli@...e.de>
To:     shile.zhang@...ux.alibaba.com
Cc:     Kent Overstreet <kent.overstreet@...il.com>,
        linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bcache: add cond_resched() in __bch_cache_cmp()

On 2019/3/7 1:15 下午, shile.zhang@...ux.alibaba.com wrote:
> From: Shile Zhang <shile.zhang@...ux.alibaba.com>
> 
> Read /sys/fs/bcache/<uuid>/cacheN/priority_stats can take very long
> time with huge cache after long run.
> 
> Signed-off-by: Shile Zhang <shile.zhang@...ux.alibaba.com>

Hi Shile,

Do you test your change ? It will be helpful with more performance data
(what problem that you improved).

Thanks.

Coly Li

> ---
>  drivers/md/bcache/sysfs.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
> index 557a8a3..028fea1 100644
> --- a/drivers/md/bcache/sysfs.c
> +++ b/drivers/md/bcache/sysfs.c
> @@ -897,6 +897,7 @@ static void bch_cache_set_internal_release(struct kobject *k)
>  
>  static int __bch_cache_cmp(const void *l, const void *r)
>  {
> +	cond_resched();
>  	return *((uint16_t *)r) - *((uint16_t *)l);
>  }
>  
> 


-- 

Coly Li