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SubjectRe: [PATCH RFC 2/2] mm: Use pte markers for swap errors
On 2022/10/25 4:48, Peter Xu wrote:
> PTE markers are ideal mechanism for things like SWP_SWAPIN_ERROR. Using a
> whole swap entry type for this purpose can be an overkill, especially if we
> already have PTE markers. Define a new bit for swapin error and replace it
> with pte markers. Then we can safely drop SWP_SWAPIN_ERROR and give one
> device slot back to swap.
> We used to have SWP_SWAPIN_ERROR taking the page pfn as part of the swap
> entry, but it's never used. Neither do I see how it can be useful because
> normally the swapin failure should not be caused by a bad page but bad swap
> device. Drop it alongside.
> Signed-off-by: Peter Xu <>

Thanks for doing this. I have been waiting this for a "long" time. ;)
With changing the name of PTE_MARKER_SWAP_ERROR proposed by David, this
patch looks good to me.

Reviewed-by: Miaohe Lin <>

Miaohe Lin

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