From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from stravinsky.debian.org (stravinsky.debian.org [82.195.75.108]) (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 5CEC639FCBC; Wed, 4 Mar 2026 13:49:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=82.195.75.108 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772632143; cv=none; b=RdRwwCEcHOQkfqsoNes5u3AwHhEI1/VaCfsUkkb6F5WrItoGbtfznTPhMfvD5W8/LuJBh8p0qhfu5zWFJqwqyj6PQoTJ8wlkSWvlKyDx41Qz54yS6PIywnF5AWnJobpjz/5SEbq1zb+jTXQVTsylEH0cscAVciEvAiY+4pOwapw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772632143; c=relaxed/simple; bh=qOc2VmidsMlzi9mWf/yfs4Ql8Hq0zsQO1aGzkGYtWCA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Z4Uq/bv3d2rS8B4RXeAa88L0FSEZNmke1MVITf97UogstelOl3mOy9XVI+yDkd1sM+/Ba/2pNDVasdK83LZuUD4qPw7J2HUsrnFHqdN+xyOHkQrNsvWAJwL7pBIxHOdWN3EcRaP3m+6TB8L8K+ncEIcqE63qhMl6VfxnajNzm38= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=debian.org; spf=none smtp.mailfrom=debian.org; dkim=pass (2048-bit key) header.d=debian.org header.i=@debian.org header.b=QHEnG8/K; arc=none smtp.client-ip=82.195.75.108 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=debian.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=debian.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=debian.org header.i=@debian.org header.b="QHEnG8/K" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=debian.org; s=smtpauto.stravinsky; h=X-Debian-User:In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Reply-To:Content-ID:Content-Description; bh=qOc2VmidsMlzi9mWf/yfs4Ql8Hq0zsQO1aGzkGYtWCA=; b=QHEnG8/K4CkkGOo2R0wxB0IQvd 7hDWzybVnBQBVOlXKZi7R2k5bIvfxmK2ISb3LeGtv78AueHd+vlyjWiyUGI62AEuBeTiH4Nw3Qu93 C4FMc2GwDNEL3gCdF4dWzsyz/qp7Qk3cmoNIopmzvIb0QzSNo9TQGJ6IEYV0CJPi/6NJoG95LDkvJ cx5QU/U4VyiLfiIE9KJQDTVLKyM9hVa0vgAqULC0MDDqYyjuwUQnPnERnH6XjYp9jxnK6Z1lpY9SG tCCtjUa8fh4fHfHhtVAfGdTqFNtPLC4Wy405vAVBdaH2aqJPVg7CFNnfVvIjkFx4OoIupJ0Ds3bQ9 m785yV+g==; Received: from authenticated user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94.2) (envelope-from ) id 1vxmav-00Fzzj-Ar; Wed, 04 Mar 2026 13:48:57 +0000 Date: Wed, 4 Mar 2026 05:48:52 -0800 From: Breno Leitao To: Michal =?utf-8?Q?Koutn=C3=BD?= Cc: Tejun Heo , Jens Axboe , Josef Bacik , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, thevlad@meta.com, kernel-team@meta.com Subject: Re: [PATCH v2] blk-cgroup: always display debug stats in io.stat Message-ID: References: <20260303-blk_cgroup_debug_stats-v2-1-196c713cb762@debian.org> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Debian-User: leitao Hello Michal, On Wed, Mar 04, 2026 at 02:28:03PM +0100, Michal Koutný wrote: > > On Wed, Mar 04, 2026 at 01:56:43AM -0800, Breno Leitao wrote: > > My goal is to ship a kernel that exposes these detailed io stats by > > default, without requiring any runtime configuration. The stats should > > simply be available out of the box. > > Does it mean the information is useful to you since early boot and > adjusting the param with a userspace tool in boot sequence is too late? Not exactly. The goal is to have a kernel binary that, regardless of where it is deployed and how it is configured, I know know it provides full io.stat details without requiring any tunable to be changed.