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

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Message-ID: <87r0ywli7n.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date:   Tue, 25 Oct 2022 11:01:32 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        HORIGUCHI NAOYA <naoya.horiguchi@....com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        David Hildenbrand <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH RFC 0/2] mm: Use pte marker for swapin errors

Peter Xu <peterx@...hat.com> writes:

> Hi,
>
> This series uses the pte marker to replace the swapin error swap entry,
> then we safe one more swap entry.  A new pte marker bit is defined.
          ~~~~               ~~~~~
          save?              file?

It's good to save one swap file.  Thanks for your patch!  Please feel
free to add my

Reviewed-by: "Huang, Ying" <ying.huang@...el.com>

for the whole series.

Best Regards,
Huang, Ying

> One thing worth mentioning: we need the pte marker to be always built to
> make sure it works like before, so I made an attempt in patch 1 to drop
> CONFIG_PTE_MARKER and always compile pte marker in.  Since pte markers are
> enabled in many distributions by default already, meanwhile the codeset is
> really small I assume it's fine.  But still I'm tagging with RFC for this
> initial version.
>
> Smoke tested on anonymous mem on a fake swap failure.  Please have a look,
> thanks.
>
> Peter Xu (2):
>   mm: Always compile in pte markers
>   mm: Use pte markers for swap errors
>
>  include/linux/swap.h    | 16 ++++----------
>  include/linux/swapops.h | 49 +++++++++--------------------------------
>  mm/Kconfig              |  7 ------
>  mm/memory.c             | 13 ++++++-----
>  mm/shmem.c              |  2 +-
>  mm/swapfile.c           |  2 +-
>  6 files changed, 23 insertions(+), 66 deletions(-)