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

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Date: Thu, 20 Jun 2024 17:36:55 +0200
From: Julian Sikorski <belegdol@...il.com>
To: visitorckw@...il.com
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

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