linux-kernel - Re: [PATCH] x86 tsc: avoid system instability in hibernation

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Message-ID: <20241210123516.GP8562@noisy.programming.kicks-ass.net>
Date: Tue, 10 Dec 2024 13:35:16 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Atharva Tiwari <evepolonium@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Lakshmi Sowjanya D <lakshmi.sowjanya.d@...el.com>,
	Peter Hilber <peter.hilber@...nsynergy.com>,
	"Christopher S. Hall" <christopher.s.hall@...el.com>,
	Feng Tang <feng.tang@...el.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Marco Elver <elver@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86 tsc: avoid system instability in hibernation

On Tue, Dec 10, 2024 at 11:54:18AM +0530, Atharva Tiwari wrote:
> System instability are seen during resume from hibernation when system
> is under heavy CPU load. This is due to the lack of update of sched
> clock data, and the scheduler would then think that heavy CPU hog
> tasks need more time in CPU, causing the system to freeze
> during the unfreezing of tasks.

Please tell me more.. what crazy things are happening?