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SubjectRe: [v2 PATCH 1/2] mm: swap: check if swap backing device is congested or not
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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

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