linux-kernel - Re: [PATCH 0/2] mm: Use pte marker for swapin errors

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Message-ID: <Y1/YT9/PcF6kx/gq@x1n>
Date:   Mon, 31 Oct 2022 10:14:39 -0400
From:   Peter Xu <peterx@...hat.com>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        David Hildenbrand <david@...hat.com>,
        HORIGUCHI NAOYA <naoya.horiguchi@....com>,
        Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH 0/2] mm: Use pte marker for swapin errors

On Mon, Oct 31, 2022 at 09:40:15AM +0800, Huang, Ying wrote:
> Peter Xu <peterx@...hat.com> writes:
> 
> > rfc->v1:
> > - Rename SWAP_ERROR -> SWAPIN_ERROR [David, Miaohe]
> > - Added r-bs for Ying and Miaohe
> >
> > Hi,
> >
> > This series uses the pte marker to replace the swapin error swap entry,
> > then we save one more swap entry slot for swap devices.  A new pte marker
> > bit is defined.
> 
> Per my understanding, "swap entry" describes one swap page (4KB on x86)
> in one swap device.  So, the original swapin error implementation uses
> one swap file (or swap device) instead of one swap entry.  So your patch
> saves one swap file (or swap device).

Yeah I was definitely not accurate enough, I wanted to use "slot" to mean
"type" here but obviously I didn't make it, sorry.  Hopefully the whole
patchset is still clear enough anyway so no reader will get confused by it.

-- 
Peter Xu