RE: [PATCH v5 0/3] mm: ZSWAP swap-out of mTHP folios

[Sridhar, Kanchana P]

> -----Original Message-----
> From: Nhat Pham <nphamcs@xxxxxxxxx>
> Sent: Wednesday, August 28, 2024 2:35 PM
> To: Sridhar, Kanchana P <kanchana.p.sridhar@xxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx;
> hannes@xxxxxxxxxxx; yosryahmed@xxxxxxxxxx; ryan.roberts@xxxxxxx;
> Huang, Ying <ying.huang@xxxxxxxxx>; 21cnbao@xxxxxxxxx; akpm@linux-
> foundation.org; Zou, Nanhai <nanhai.zou@xxxxxxxxx>; Feghali, Wajdi K
> <wajdi.k.feghali@xxxxxxxxx>; Gopal, Vinodh <vinodh.gopal@xxxxxxxxx>
> Subject: Re: [PATCH v5 0/3] mm: ZSWAP swap-out of mTHP folios
> 
> On Wed, Aug 28, 2024 at 2:35 AM Kanchana P Sridhar
> <kanchana.p.sridhar@xxxxxxxxx> wrote:

[snip]

> My understanding is from zswap's perspective, the large folio is
> broken apart into independent subpages, correct? What happens when we

Yes, this is correct.

> have partially written back mTHP (i.e some subpages are in zswap
> still, whereas others are written back to swap). Would this
> automatically prevent mTHP swapin?