linux-kernel - Re: [PATCH 1/2] mm/zsmalloc: don't hold locks of all pages when free

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Message-ID: <20240228060756.GK11972@google.com>
Date: Wed, 28 Feb 2024 15:07:56 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Chengming Zhou <chengming.zhou@...ux.dev>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
	Chengming Zhou <zhouchengming@...edance.com>, yosryahmed@...gle.com,
	hannes@...xchg.org, nphamcs@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 1/2] mm/zsmalloc: don't hold locks of all pages when
 free_zspage()

On (24/02/28 13:42), Chengming Zhou wrote:
> > I'm curious if we want to add RCU to the picture, given that zsmalloc
> > is quite often run under memory pressure.
> 
> Yes, it's a reasonable point. But given struct zspage size has only 56 bytes,
> it maybe not a problem to delay its free to RCU?

Hmm, yeah, probably.  I think it'll make sense to wait for more
"go for it" from Cc-ed folks before we land this series.