linux-kernel - Re: [PATCH 1/6] mm/zswap: add more comments in shrink_memcg

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Message-ID: <20240201174547.GA321148@cmpxchg.org>
Date: Thu, 1 Feb 2024 12:45:47 -0500
From: Johannes Weiner <hannes@...xchg.org>
To: Chengming Zhou <zhouchengming@...edance.com>
Cc: Nhat Pham <nphamcs@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yosry Ahmed <yosryahmed@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 1/6] mm/zswap: add more comments in shrink_memcg_cb()

On Thu, Feb 01, 2024 at 03:49:01PM +0000, Chengming Zhou wrote:
> Add more comments in shrink_memcg_cb() to describe the deref dance
> which is implemented to fix race problem between lru writeback and
> swapoff, and the reason why we rotate the entry at the beginning.
> 
> Also fix the stale comments in zswap_writeback_entry(), and add
> more comments to state that we only deref the tree after we get
> the swapcache reference.
> 
> Suggested-by: Yosry Ahmed <yosryahmed@...gle.com>
> Suggested-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>

Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Thanks!