linux-kernel - Re: [PATCH v9 2/7] mm: zswap: Modify zswap_compress() to accept a page instead of a folio.

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Message-ID: <CAJD7tkaFZAYT97nDfxd=t5TvKd2Zq5omauJUdLrCffcwP5OQzA@mail.gmail.com>
Date: Mon, 30 Sep 2024 15:16:48 -0700
From: Yosry Ahmed <yosryahmed@...gle.com>
To: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, hannes@...xchg.org, 
	nphamcs@...il.com, chengming.zhou@...ux.dev, usamaarif642@...il.com, 
	shakeel.butt@...ux.dev, ryan.roberts@....com, ying.huang@...el.com, 
	21cnbao@...il.com, akpm@...ux-foundation.org, willy@...radead.org, 
	nanhai.zou@...el.com, wajdi.k.feghali@...el.com, vinodh.gopal@...el.com
Subject: Re: [PATCH v9 2/7] mm: zswap: Modify zswap_compress() to accept a
 page instead of a folio.

On Mon, Sep 30, 2024 at 3:12 PM Kanchana P Sridhar
<kanchana.p.sridhar@...el.com> wrote:
>
> For zswap_store() to be able to store a large folio by compressing it
> one page at a time, zswap_compress() needs to accept a page as input.
> This will allow us to iterate through each page in the folio in
> zswap_store(), compress it and store it in the zpool.
>
> Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
> Reviewed-by: Nhat Pham <nphamcs@...il.com>
> Reviewed-by: Chengming Zhou <chengming.zhou@...ux.dev>
> Acked-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Yosry Ahmed <yosryahmed@...gle.com>

> ---
>  mm/zswap.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/mm/zswap.c b/mm/zswap.c
> index efad4e941e44..fd7a8c14457a 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -875,7 +875,7 @@ static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node)
>         return 0;
>  }
>
> -static bool zswap_compress(struct folio *folio, struct zswap_entry *entry)
> +static bool zswap_compress(struct page *page, struct zswap_entry *entry)
>  {
>         struct crypto_acomp_ctx *acomp_ctx;
>         struct scatterlist input, output;
> @@ -893,7 +893,7 @@ static bool zswap_compress(struct folio *folio, struct zswap_entry *entry)
>
>         dst = acomp_ctx->buffer;
>         sg_init_table(&input, 1);
> -       sg_set_folio(&input, folio, PAGE_SIZE, 0);
> +       sg_set_page(&input, page, PAGE_SIZE, 0);
>
>         /*
>          * We need PAGE_SIZE * 2 here since there maybe over-compression case,
> @@ -1456,7 +1456,7 @@ bool zswap_store(struct folio *folio)
>                 mem_cgroup_put(memcg);
>         }
>
> -       if (!zswap_compress(folio, entry))
> +       if (!zswap_compress(&folio->page, entry))
>                 goto put_pool;
>
>         entry->swpentry = swp;
> --
> 2.27.0
>