linux-kernel - Re: [linus:master] [readahead] ab4443fe3c: vm-scalability.throughput -21.4% regression

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Date: Wed, 6 Mar 2024 13:36:16 +0800
From: Yin Fengwei <fengwei.yin@...el.com>
To: Yujie Liu <yujie.liu@...el.com>, Jan Kara <jack@...e.cz>
CC: Oliver Sang <oliver.sang@...el.com>, <oe-lkp@...ts.linux.dev>,
	<lkp@...el.com>, <linux-kernel@...r.kernel.org>, Andrew Morton
	<akpm@...ux-foundation.org>, Matthew Wilcox <willy@...radead.org>, Guo Xuenan
	<guoxuenan@...wei.com>, <linux-fsdevel@...r.kernel.org>,
	<ying.huang@...el.com>, <feng.tang@...el.com>
Subject: Re: [linus:master] [readahead] ab4443fe3c: vm-scalability.throughput
 -21.4% regression



On 3/4/24 13:35, Yin, Fengwei wrote:
> Even the file read throughput is almost same. But the distribution of
> order looks like a regression with ab4443fe3ca6 (more smaller order
> page cache is generated than parent commit). Thanks.
There may be confusion here. Let me clarify it as:
I shouldn't say folio order distribution is a regression. It's smaller
folio order cause more folios added in page cache for same workload. And
raise the lru lock contention which trigger the regression.


Regards
Yin, Fengwei