linux-kernel - Re: [PATCH 2/2] lib/sort: Optimize heapsort with double-pop variation

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Message-ID: <117b2819-a146-476c-9533-43f40512d42b@amd.com>
Date: Thu, 20 Jun 2024 15:17:02 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Julian Sikorski <belegdol@...il.com>, visitorckw@...il.com,
 Linux kernel regressions list <regressions@...ts.linux.dev>
Cc: akpm@...ux-foundation.org, jserv@...s.ncku.edu.tw,
 linux-kernel@...r.kernel.org, lkml@....org, alexdeucher@...il.com
Subject: Re: [PATCH 2/2] lib/sort: Optimize heapsort with double-pop variation

On 6/20/2024 10:36, Julian Sikorski wrote:
> Hello,
> 
> it appears that this patch has caused suspend-to-idle regression:
> 
> https://gitlab.freedesktop.org/drm/amd/-/issues/3436
> 
> In brief, my laptop fails to suspend completely with the following error 
> in the log:
> 
> Jun 18 12:42:20 kernel: amd_pmc AMDI0005:00: Last suspend didn't reach 
> deepest state
> 
> Power consumption remains high enough that my battery has already 
> unexpectedly drained twice before I noticed something was off.
> I am not entirely sure how changes to sorting function can influence 
> suspend, but it is what it is. 6.9.5 as shipped by Fedora 40 exhibits 
> the issue, 6.9.5 as shipped by Fedora with the patch reverted does not.
> 
> Best regards,
> Juliam
> 

+regressions M/L

#regzbot ^introduced: 0e02ca29a563
#regzbot from: Kuan-Wei Chiu <visitorckw@...il.com>
#regzbot monitor: https://gitlab.freedesktop.org/drm/amd/-/issues/3436