From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C38B2EA731 for ; Sat, 20 Dec 2025 08:38:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766219914; cv=none; b=d8wgrlpEExfMwN+zIT1OocEYwcWhQ1+AjRvP9owOlhZ9iV/1wzpvw5Z+zK95UukStXFbvKo2qMRycf3WYqNJ3+/XkhkPdo7S8FQVu55mFTRIg3hVdpRgilOAmXh5yNWYWoaZt1QgVzXx1N7dOBJbOadZBVEdkJpDWfu2Yv1aTgM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766219914; c=relaxed/simple; bh=1dHHtyG9p1ACEP1xlV+2xIs6oPrDb97wFahgRxKifbY=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=cCWQm9BVgDlSPrS1jmm0l6biEct41LkzUnRxvjIcvTnNwmHXbVbZRjDBWi9B2RTEF1zVzBBg6J0Zvr7/e1By3GoyEuquq3IVWQX5t1kUhLCf3Xb43ASVjApraUODCAtl+6VAnL47C9CFp32eB0O4KaFHA55NcwE2YUfHLoTrCLo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=vm7NTYBj; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=0kYiUkQX; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="vm7NTYBj"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="0kYiUkQX" From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1766219911; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=T3NKxw16SgLGgHMSL4mhrKzfdvRwMw1EQG/ysGhvV44=; b=vm7NTYBj9bPTFKOty8oy1g4WeNfFRmMaozqFPSlbPUEaVbx1IiNsk1FuEVzxrV/7TvoDXY Ra7d44eWONpTaULMvaYvemz/AjroCc071/Kjm7eSUi5Fz7s72XOng6qVNwoLnbang8EwgJ XlmUGLW56XUyk/UJ1sfDzSAQ5BQmD5KrMVLXPqbu8o9/QMuCeT7F7rOLp0ZK1NPE/oQHZJ cDNdE2E1d3pUOjiJ0gKobjYst/vG7SbD+MSXOXyEuITgfbIaCU4rhf7N0Vd+oiRR3N5prc ezLfRlQIjOaMTBHfWb6VccFpdmD/HGRvNZn/KQPPMzQ2IS+3670j9xWQrUua3A== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1766219911; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=T3NKxw16SgLGgHMSL4mhrKzfdvRwMw1EQG/ysGhvV44=; b=0kYiUkQXUnEmY+ZKV9AR/NkVCW/iI7rWZ1WQMnc0LXWpoZI+d9qUrTFEuGd2VIrf5QaEBi MtSIME32x4McScAQ== To: paulmck@kernel.org Cc: LKML , Daniel J Blueman , John Stultz , Waiman Long , Peter Zijlstra , Dave Hansen , Tony Luck , Borislav Petkov , Stephen Boyd , Scott Hamilton Subject: Re: clocksource: Reduce watchdog readout delay limit to prevent false positives In-Reply-To: <308f260b-83c6-402e-9756-017be125bb44@paulmck-laptop> References: <87bjjxc9dq.ffs@tglx> <90dce4d0-bd90-4321-95d8-c8dd1c121de0@paulmck-laptop> <878qeybwzy.ffs@tglx> <308f260b-83c6-402e-9756-017be125bb44@paulmck-laptop> Date: Sat, 20 Dec 2025 09:38:31 +0100 Message-ID: <87qzspa6pk.ffs@tglx> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Fri, Dec 19 2025 at 16:18, Paul E. McKenney wrote: > One might naively hope that the HPETs in a given system could synchronize > themselves so that each CPU could read the HPET nearest it instead of > everyone reading CPU 0's HPET. Or that some other means would allow > reasonable access times. Hey, I can dream, can't I? Sounds more like a nightmare TBH.