linux-kernel - Re: [PATCH 2/2] mm: zswap.c: remove RB tree

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Date: Fri, 19 Jan 2024 11:37:44 -0800
From: Yosry Ahmed <yosryahmed@...gle.com>
To: Chris Li <chrisl@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, Wei Xu <weixugc@...gle.com>, 
	Yu Zhao <yuzhao@...gle.com>, Greg Thelen <gthelen@...gle.com>, 
	Chun-Tse Shao <ctshao@...gle.com>, Suren Baghdasaryan <surenb@...gle.com>, 
	Brain Geffon <bgeffon@...gle.com>, Minchan Kim <minchan@...nel.org>, Michal Hocko <mhocko@...e.com>, 
	Mel Gorman <mgorman@...hsingularity.net>, Huang Ying <ying.huang@...el.com>, 
	Nhat Pham <nphamcs@...il.com>, Johannes Weiner <hannes@...xchg.org>, Kairui Song <kasong@...cent.com>, 
	Zhongkun He <hezhongkun.hzk@...edance.com>, Kemeng Shi <shikemeng@...weicloud.com>, 
	Barry Song <v-songbaohua@...o.com>, "Matthew Wilcox (Oracle)" <willy@...radead.org>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Joel Fernandes <joel@...lfernandes.org>, 
	Chengming Zhou <zhouchengming@...edance.com>
Subject: Re: [PATCH 2/2] mm: zswap.c: remove RB tree

> > If this is doable, I think we can return xa_store(..) and keep the
> > logic in the caller. I think there's a chance
> > zswap_{search/insert/erase} may end up being very thin wrappers around
> > xa_{load/store/erase}, and we may be able to remove them completely.
> > Let's see how it goes.
> >
>
> See my other email about erasing an entry raced into a new entry. That
> is the part I am not certain.
> Anyway, when zswap adopte folio, then it might need to handle multi
> entry, we will be back to using the XAS API.

Handling large folios in zswap is a much larger topic that involves a
lot more than this xa_* vs. xas_* apis dispute. Let's not worry about
this for now.