From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) (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 E5968C2C9 for ; Sun, 3 Aug 2025 19:35:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754249754; cv=none; b=rt6g7SbTYuijS2cjbwoEzEc3OiaugC0OubC2fVzTmCzLdW+c4U5aRKf2nKaauuX1yMIJa3DBQTGoB/Sj7Jw3iNZiPusrV1/TRmYXi8i5uWofoxOpeHM5EjFfUHWW1faVFjSQai30Nz4wO6EpOOfptTZa1LcPAynKTzFgR4Pu0GY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754249754; c=relaxed/simple; bh=O5bGdlyKzq7PEHXAHNamM4nQF1j1XjnCQYWGGYYsKaE=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=CvozN/AW1CBmGnzwref3JpMbpU5NNTup5h2Wdu9y3FMAAZgjDpev9u8IWjj3fL7jTxkyJwqOn320hqXRPoAYy0lgSvIW1mqCDWz6A+xe6rg4GTd+z7YE23TPS6qjAcsjW3KGd+bYlS2QIKMNimct9hYhKGKpMtNNwbp/HEgDbQY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 0CA2BBB6C9; Sun, 3 Aug 2025 19:35:43 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf11.hostedemail.com (Postfix) with ESMTPA id 9818E20029; Sun, 3 Aug 2025 19:35:41 +0000 (UTC) Date: Sun, 3 Aug 2025 15:36:07 -0400 From: Steven Rostedt To: Linus Torvalds Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Peter Zijlstra , Thomas Gleixner , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Mel Gorman , Tejun Heo , Valentin Schneider , Shrikanth Hegde Subject: Re: [GIT PULL] Scheduler updates for v6.17 Message-ID: <20250803153607.2bf1b32e@gandalf.local.home> In-Reply-To: <20250803152411.7fd91614@gandalf.local.home> References: <20250802154645.52712449@gandalf.local.home> <20250803152411.7fd91614@gandalf.local.home> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) 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=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 9818E20029 X-Stat-Signature: k4ktc6r9knr3juhfo5xry8mkeb5imaik X-Rspamd-Server: rspamout02 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX19ohwmz62V5GLJefXU187ulryQ/W/a2EOk= X-HE-Tag: 1754249741-623381 X-HE-Meta: U2FsdGVkX19jgCD0z+0rUCVQ20NyooQfLUdla1DxrLfeiMx9ShA7wp6/jQHzaIZ6bnpmLGN7MI2ZQy9B0fw7oaLR6LhKnXAWhLQCjaLVnTKKDEQ92UfC9SoDaXhdZXiYkB2WCA2stZavc6zxf7QWtkystfQn/fhMEmqwmgQI2UmEPOS24SgCwHQ5DWO6CLmQxhFaKvnCsZdBj5xd5KHBx5+vSUC7KQMlyE7vXwLnzYZLbXS2H7OCu1rviNue1+qATZzWMbt/VhcH5JL8ti+Brzil4Myi7m9ciqSU05Cfk2Lrh/5lxwKvDHudGfcHMIoQ8SDdbNQy2W3eeGOpNNm++jcOAvzOsk+d2bWMMi1VAYZBiHNYA+g9QPBrmYwFh9QW On Sun, 3 Aug 2025 15:24:11 -0400 Steven Rostedt wrote: > If your machine doesn't clear the memory on reboot, you could use the > persistent ring buffer too: > > Adding to the kernel command line: > > reserve_mem=20M:12M:trace trace_instance=boot_mapped@trace You can know if this works by adding the above to the kernel command line then boot once. Do a reboot, and if the second boot dmesg has something like: Ring buffer meta [0] is from previous boot! You're good to go. But if it has: Ring buffer boot meta[0] mismatch of magic or struct size Then it likely will not work. -- Steve