linux-kernel - RE: [PATCH v8 5/8] mm: zswap: Modify zswap_stored_pages to be atomic_long

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Message-ID: <SJ0PR11MB5678CADC4658BDB1628C0238C9752@SJ0PR11MB5678.namprd11.prod.outlook.com>
Date: Sun, 29 Sep 2024 21:03:29 +0000
From: "Sridhar, Kanchana P" <kanchana.p.sridhar@...el.com>
To: Johannes Weiner <hannes@...xchg.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, "yosryahmed@...gle.com"
	<yosryahmed@...gle.com>, "nphamcs@...il.com" <nphamcs@...il.com>,
	"chengming.zhou@...ux.dev" <chengming.zhou@...ux.dev>,
	"usamaarif642@...il.com" <usamaarif642@...il.com>, "shakeel.butt@...ux.dev"
	<shakeel.butt@...ux.dev>, "ryan.roberts@....com" <ryan.roberts@....com>,
	"Huang, Ying" <ying.huang@...el.com>, "21cnbao@...il.com"
	<21cnbao@...il.com>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Zou, Nanhai" <nanhai.zou@...el.com>, "Feghali, Wajdi K"
	<wajdi.k.feghali@...el.com>, "Gopal, Vinodh" <vinodh.gopal@...el.com>,
	"Sridhar, Kanchana P" <kanchana.p.sridhar@...el.com>
Subject: RE: [PATCH v8 5/8] mm: zswap: Modify zswap_stored_pages to be
 atomic_long_t.

> -----Original Message-----
> From: Johannes Weiner <hannes@...xchg.org>
> Sent: Saturday, September 28, 2024 6:54 AM
> To: Sridhar, Kanchana P <kanchana.p.sridhar@...el.com>
> Cc: linux-kernel@...r.kernel.org; linux-mm@...ck.org;
> yosryahmed@...gle.com; nphamcs@...il.com;
> chengming.zhou@...ux.dev; usamaarif642@...il.com;
> shakeel.butt@...ux.dev; ryan.roberts@....com; Huang, Ying
> <ying.huang@...el.com>; 21cnbao@...il.com; akpm@...ux-foundation.org;
> Zou, Nanhai <nanhai.zou@...el.com>; Feghali, Wajdi K
> <wajdi.k.feghali@...el.com>; Gopal, Vinodh <vinodh.gopal@...el.com>
> Subject: Re: [PATCH v8 5/8] mm: zswap: Modify zswap_stored_pages to be
> atomic_long_t.
> 
> On Fri, Sep 27, 2024 at 07:16:17PM -0700, Kanchana P Sridhar wrote:
> > For zswap_store() to support large folios, we need to be able to do
> > a batch update of zswap_stored_pages upon successful store of all pages
> > in the folio. For this, we need to add folio_nr_pages(), which returns
> > a long, to zswap_stored_pages.
> >
> > Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
> 
> Long for pages makes sense to me even independent of the large folios
> coming in. An int is just 8TB in 4k (base) pages.
> 
> Acked-by: Johannes Weiner <hannes@...xchg.org>

Thanks Johannes for the Acked-by's!

Thanks,
Kanchana