linux-kernel - Re: [PATCH 3/8] mm/zswap: Use PG_dropbehind instead of PG

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Message-ID: <CAJD7tkYfh=K1FV2NPFD5P0+Td66PtoMRHAkAcwUJcRwYDKLZjQ@mail.gmail.com>
Date: Mon, 13 Jan 2025 08:10:45 -0800
From: Yosry Ahmed <yosryahmed@...gle.com>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	"Matthew Wilcox (Oracle)" <willy@...radead.org>, Jens Axboe <axboe@...nel.dk>, 
	"Jason A. Donenfeld" <Jason@...c4.com>, Andi Shyti <andi.shyti@...ux.intel.com>, 
	Chengming Zhou <chengming.zhou@...ux.dev>, Christian Brauner <brauner@...nel.org>, 
	Christophe Leroy <christophe.leroy@...roup.eu>, Dan Carpenter <dan.carpenter@...aro.org>, 
	David Airlie <airlied@...il.com>, David Hildenbrand <david@...hat.com>, Hao Ge <gehao@...inos.cn>, 
	Jani Nikula <jani.nikula@...ux.intel.com>, Johannes Weiner <hannes@...xchg.org>, 
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>, Josef Bacik <josef@...icpanda.com>, 
	Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
	Miklos Szeredi <miklos@...redi.hu>, Nhat Pham <nphamcs@...il.com>, 
	Oscar Salvador <osalvador@...e.de>, Ran Xiaokai <ran.xiaokai@....com.cn>, 
	Rodrigo Vivi <rodrigo.vivi@...el.com>, Simona Vetter <simona@...ll.ch>, 
	Steven Rostedt <rostedt@...dmis.org>, Tvrtko Ursulin <tursulin@...ulin.net>, 
	Vlastimil Babka <vbabka@...e.cz>, Yu Zhao <yuzhao@...gle.com>, intel-gfx@...ts.freedesktop.org, 
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, 
	linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH 3/8] mm/zswap: Use PG_dropbehind instead of PG_reclaim

On Mon, Jan 13, 2025 at 1:35 AM Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
>
> The recently introduced PG_dropbehind allows for freeing folios
> immediately after writeback. Unlike PG_reclaim, it does not need vmscan
> to be involved to get the folio freed.
>
> Instead of using folio_set_reclaim(), use folio_set_dropbehind() in
> zswap_writeback_entry().
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

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

> ---
>  mm/zswap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/zswap.c b/mm/zswap.c
> index 167ae641379f..c20bad0b0978 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -1096,8 +1096,8 @@ static int zswap_writeback_entry(struct zswap_entry *entry,
>         /* folio is up to date */
>         folio_mark_uptodate(folio);
>
> -       /* move it to the tail of the inactive list after end_writeback */
> -       folio_set_reclaim(folio);
> +       /* free the folio after writeback */
> +       folio_set_dropbehind(folio);
>
>         /* start writeback */
>         __swap_writepage(folio, &wbc);
> --
> 2.45.2
>