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Date: Wed, 28 Feb 2024 15:14:00 +0900
From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: Chengming Zhou <zhouchengming@bytedance.com>
Cc: yosryahmed@google.com, Sergey Senozhatsky <senozhatsky@chromium.org>,
	hannes@cmpxchg.org, nphamcs@gmail.com,
	Andrew Morton <akpm@linux-foundation.org>,
	Minchan Kim <minchan@kernel.org>, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: [PATCH 1/2] mm/zsmalloc: don't hold locks of all pages when
 free_zspage()
Message-ID: <20240228061400.GL11972@google.com>
References: <20240226-zsmalloc-zspage-rcu-v1-0-456b0ef1a89d@bytedance.com>
 <20240226-zsmalloc-zspage-rcu-v1-1-456b0ef1a89d@bytedance.com>
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In-Reply-To: <20240226-zsmalloc-zspage-rcu-v1-1-456b0ef1a89d@bytedance.com>

On (24/02/27 03:02), Chengming Zhou wrote:
> @@ -834,13 +841,12 @@ static void __free_zspage(struct zs_pool *pool, struct size_class *class,
>  		VM_BUG_ON_PAGE(!PageLocked(page), page);
>  		next = get_next_page(page);
>  		reset_page(page);

reset_page()->__ClearPageMovable()->PageMovable() expects page to be
locked.

> -		unlock_page(page);
>  		dec_zone_page_state(page, NR_ZSPAGES);
>  		put_page(page);
>  		page = next;
>  	} while (page != NULL);