From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mslow3.mail.gandi.net (mslow3.mail.gandi.net [217.70.178.249]) (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 2118935E921 for ; Tue, 14 Apr 2026 07:09:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.178.249 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776150582; cv=none; b=eHQv+fIBdSubZwxUl8+xXRyp2Fglnprsx7pDlhOdCO/f1/n6l1h1cy05EdbZEq2K6JdVUjNa6ZDJvCxNbJjEVnG43lU4OI7GVjXM+C1m5DDuPcMdhrNw07ov4A5oMQklJvOuuoccVm6NPuN09MW7mvWOufRVw4hzxAiO96ZXofA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776150582; c=relaxed/simple; bh=GqaQ+AJMY6aUwbJVm0TkQ+G0i6LOxq2OJ2E0hTPpqio=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=IwrU+YQw7mU5P6bR5XFMvcOmjf52fO/7BHwaMawAbITanezK5c3VHsc2MMSyeU5KxXCoTCmu7kPXpBEITNo0qDcwKtSffomYQjJpC6SNQATLzMX/MsrrYHWYt+UX3bTTcL4rWg4BnMUV+xJdcccE/t3ddiMZrvb3lWlP2A5iRAc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=xenomai.org; spf=pass smtp.mailfrom=xenomai.org; dkim=pass (2048-bit key) header.d=xenomai.org header.i=@xenomai.org header.b=YEFLaeae; arc=none smtp.client-ip=217.70.178.249 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=xenomai.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=xenomai.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=xenomai.org header.i=@xenomai.org header.b="YEFLaeae" Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [IPv6:2001:4b98:dc4:8::226]) by mslow3.mail.gandi.net (Postfix) with ESMTP id 2CCF0581A1D for ; Tue, 14 Apr 2026 07:05:51 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id 4CA293EC36; Tue, 14 Apr 2026 07:05:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=xenomai.org; s=gm1; t=1776150343; 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=/3iEQF53DYmp78DVmXyaX2ah5BCsPe7act1zxUt0j4c=; b=YEFLaeaekdQ+VBwyYtcoIhB8ob/6rkT00tSGXTcP40o1jQb5SRvzVNtLQClXTsG+sc5u83 kYOL4980a9TQ/WkbeGdIv9gJhuVUF0XrL5mrhIhSq7UOM222mTUYCAeAM84PkFg+0sFXDE nl238Pb8GGp31YRkl1AdbTdTgCdFFLx+jUb6U3kXfYUGrywlHF2sRJJEPWp3OAyFBSkTDn +fzKdd3rA17Nrkkd4dqhZxkz8ZJdsym4BzLqz1yHPp6wUh7Ek7wmMcykQneEQeM8o38FF5 A27bu0butmLScKCzGVSZeHWyhsO3TaAZICQ9oIlONqr0bxcqGEtaDpo6/SlMGg== From: Philippe Gerum To: Jay Sridharan Cc: Brandon Ho , Brandon Ho , "xenomai@lists.linux.dev" Subject: Re: Minor page faults from memory compaction causing in-band transitions In-Reply-To: (Jay Sridharan's message of "Mon, 13 Apr 2026 19:37:44 +0000") References: <87v7e8yzhj.fsf@xenomai.org> <20260413181929.1801013-1-brho@relativityspace.com> <87h5pe7lvg.fsf@xenomai.org> User-Agent: mu4e 1.12.12; emacs 30.2 Date: Tue, 14 Apr 2026 09:05:33 +0200 Message-ID: <874ile10oy.fsf@xenomai.org> Precedence: bulk X-Mailing-List: xenomai@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain X-GND-Sasl: rpm@xenomai.org X-GND-State: clean X-GND-Score: -100 X-GND-Cause: 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 Jay Sridharan writes: > I think it would also be very useful to add these considerations to the "Caveat" page in the EVL documentation. > Agreed. > Perhaps some discussion on the impacts of CONFIG_COMPACTION, CONFIG_MIGRATION and CONFIG_TRANSPARENT_HUGEPAGE, as > well as the impact of COMPACT_UNEVICTABLE_DEFAULT. > > I know the Caveat page already has an in-depth discussion of CPU isolation and SMIs, so it feels like a good place to mention it. > > Is there a place where we can submit a patch to the docs? > Yes, please send a patch to this list, the markdown files for the website can be cloned from [1]. [1] https://gitlab.com/Xenomai/xenomai4/website -- Philippe.