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Date: Mon, 14 Mar 2022 18:52:07 +0100 From: Nicolas Saenz Julienne <nsaenzju@...hat.com> To: feng.tang@...el.com, tglx@...utronix.de Cc: andi.kleen@...el.com, bp@...en8.de, dave.hansen@...el.com, hpa@...or.com, len.brown@...el.com, linux-kernel@...r.kernel.org, mingo@...hat.com, paulmck@...nel.org, peterz@...radead.org, rui.zhang@...el.com, tim.c.chen@...el.com, x86@...nel.org, mtosatti@...hat.com, nsaenzju@...hat.com, frederic@...nel.org Subject: Re: [PATCH v3 1/2] x86/tsc: add a timer to make sure tsc_adjust is always checked Hi Feng, Thomas, > On Wed, Nov 17, 2021 at 10:37:51AM +0800, Feng Tang wrote: > Normally the tsc_sync will get checked every time system enters idle state, > but Thomas Gleixner mentioned there is still a caveat that a system won't > enter idle [1], either because it's too busy or configured purposely to not > enter idle. Setup a periodic timer (every 10 minitues) to make sure the > check is always on. > > [1]. https://lore.kernel.org/lkml/875z286xtk.fsf@nanos.tec.linutronix.de/ > Signed-off-by: Feng Tang <feng.tang@...el.com> I can see this timer interrupting my system's nohz_full CPUs. It'd be nice to be able to avoid the noise. A solution is using 'tsc=reliable', but IIUC this is not what the flag was created for. Any ideas/suggestions? Regards, Nicolas
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