linux-kernel - Re: [v2 PATCH 1/2] mm: swap: check if swap backing device is congested or not

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Message-ID: <c3c77f08-f7af-7633-636d-c467759fbf20@linux.intel.com>
Date:   Fri, 21 Dec 2018 10:34:47 -0800
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Yang Shi <yang.shi@...ux.alibaba.com>, ying.huang@...el.com,
        tim.c.chen@...el.com, minchan@...nel.org, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH 1/2] mm: swap: check if swap backing device is
 congested or not

On 12/20/18 4:21 PM, Yang Shi wrote:

> --- a/mm/swap_state.c
> +++ b/mm/swap_state.c
> @@ -538,11 +538,17 @@ struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t gfp_mask,
>  	bool do_poll = true, page_allocated;
>  	struct vm_area_struct *vma = vmf->vma;
>  	unsigned long addr = vmf->address;
> +	struct inode *inode = si->swap_file->f_mapping->host;
>  
>  	mask = swapin_nr_pages(offset) - 1;
>  	if (!mask)
>  		goto skip;
>  
> +	if (si->flags & (SWP_BLKDEV | SWP_FS)) {

Maybe move the inode dereference here: 

		inode = si->swap_file->f_mapping->host;

> +		if (inode_read_congested(inode))
> +			goto skip;
> +	}
> +

Thanks.

Tim