linux-kernel - Re: [PATCH v8 2/8] mm: zswap: Modify zswap_compress() to accept a page instead of a folio.

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Message-ID: <30d0d552-d296-48de-8e49-dc1d3c733131@linux.dev>
Date: Sat, 28 Sep 2024 13:41:57 +0800
From: Chengming Zhou <chengming.zhou@...ux.dev>
To: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, hannes@...xchg.org,
 yosryahmed@...gle.com, nphamcs@...il.com, usamaarif642@...il.com,
 shakeel.butt@...ux.dev, ryan.roberts@....com, ying.huang@...el.com,
 21cnbao@...il.com, akpm@...ux-foundation.org
Cc: nanhai.zou@...el.com, wajdi.k.feghali@...el.com, vinodh.gopal@...el.com
Subject: Re: [PATCH v8 2/8] mm: zswap: Modify zswap_compress() to accept a
 page instead of a folio.

On 2024/9/28 10:16, Kanchana P Sridhar 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>

> ---
>   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;