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 416361C6FEC for ; Tue, 15 Apr 2025 06:25:38 +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=1744698340; cv=none; b=qLXas+fbob+JmbxkR/+jl+Of877DNOOtJ0OmoRVNqwe3uwYfxh6DqU0B/r3V6XbQs61sdCSu6bN2uLOXI3JRAYqud/oJCFngMIS75BScqUgJHfvsgCcPzycSbwNxyceZy9OFlTjgc43lrOE/VfFSHXVQbQSczNVp5j1J5thuY70= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744698340; c=relaxed/simple; bh=dh5FhgAhU8QzQEcMHBR2nna5AVFACjEqIBTgqHGYQBA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Ca8lgVzZTBqCX0004nKDTncwc3S+KZp0M4xmdiNjNcS+ZKSwDQUkkxgxmjCWVj8t5nIR2/60SjwB0mrtAASm2XIkjz3aDJxnN3QZhrqujHUH2oSrSjsH80EJR4AY6NxTl2S6mEkzqdgCKbDqjmIlE5catWxJRtjKQ9i1Zav+7wQ= 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=alc5URBg; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=OTzimcXr; 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="alc5URBg"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="OTzimcXr" Date: Tue, 15 Apr 2025 08:25:36 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1744698337; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VcPw+x42bijeD1N1uyjV3n6thrcv749kYyckCWzN074=; b=alc5URBgJpTS+lZWdamyLP7p8bwwAs4nS58oUHQEXnWNvxkYwVL4gMrTevw/JPfoDm9kM5 wSuhguRfMWC7VK5GGbMsmem1J2BZGjCFGrynyipeMoOi9WdRzYGexZ2nXQnpubB9gyuPCd ORsGUbCPkEo/stctuxIbGSwCIDqLnw2hTW81G2C6sZJ1aa+Mj5hoaGV6sxu5ooQO+hhKe1 Ww5IIdX9Z5Q47J59scq6tGdaZHGkIK48l4ZGSJ8cEvTBQG9ZU/1QyedHABOKgSKnU88AjC ab+YxTE4+IBeww+YUy+K0sRbfwUq+ahniogemfeAev4RYb+/PRJjzbCmhBRCxw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1744698337; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VcPw+x42bijeD1N1uyjV3n6thrcv749kYyckCWzN074=; b=OTzimcXrUlUGf0nyGY1w0qCcxgJ09y4H0ft42ENVZoPVpPdKgtx4YD38uwcmrXzKJCkIFH zzUPBtoXhnXktzBw== From: Sebastian Andrzej Siewior To: Steven Rostedt Cc: Prakash Sangappa , "linux-kernel@vger.kernel.org" , "peterz@infradead.org" , "mathieu.desnoyers@efficios.com" , "tglx@linutronix.de" Subject: Re: [PATCH 0/2] Scheduler time extension Message-ID: <20250415062536.7tvr17qv@linutronix.de> References: <20250215005414.224409-1-prakash.sangappa@oracle.com> <20250217120000.5ae1201a@gandalf.local.home> <821926D8-ABED-4B66-9E2D-39594DB82FA1@oracle.com> <20250322061422.2b24f021@batman.local.home> <1142C71C-32B8-4C34-BA3F-4D061BA25620@oracle.com> <20250414124149.2543d6c0@gandalf.local.home> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <20250414124149.2543d6c0@gandalf.local.home> On 2025-04-14 12:41:49 [-0400], Steven Rostedt wrote: > On Fri, 11 Apr 2025 20:54:14 +0000 > Prakash Sangappa wrote: >=20 > > > On Mar 22, 2025, at 3:14=E2=80=AFAM, Steven Rostedt wrote: > > >=20 > > > On Tue, 18 Mar 2025 16:10:09 +0000 > > > Prakash Sangappa wrote: > > > =20 > > >> How do we proceed on this feature?=20 > > >> Are we leaning towards enabling this feature for SCHED_OTHER only un= der PREEMPT_LAZY? =20 > > >=20 > > > The merge window is about to open and I'm way behind in what needs to= go in. > > >=20 > > > Let's continue this discussion after rc1 comes out. =20 > >=20 > > Can the API be finalized? We have an use case which will benefit from i= t. So like to see this feature > > merged.=20 >=20 > I'm still not for SCHED_OTHER tasks being allowed to delay RT or deadline > tasks, even for 5us. But if that's what Peter wants, I'm not going to nack > it. I tried to explain in https://lore.kernel.org/all/20250206150152.-5Fauhtm@linutronix.de that I don't see how this delay could work for PREEMPT_RT. > Just keep it configurable so that it can be easily disabled, as I have no > intentions of using it. same here. > -- Steve Sebastian