From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) (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 8AFBC2FE066 for ; Mon, 2 Mar 2026 08:35:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.21 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772440521; cv=none; b=aKdsXurvnRCyLJujphs5JhcfwawwmJx6UpA65umKJfnGBsqFpuaxO6hN909LTTq2DBoqcKKJrz222a8WejYHcIZWvYHT2GxXbvJ3/fkhItwj38+FZebZZQYogFOe8LrRNmYtaxWxKy6HR4JpxG2Sr0GCk+X5N3ZSWIF0qnBkUz4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772440521; c=relaxed/simple; bh=/BOBhEcg95C5nY4rWf/nr71tGDfJMBQ0LFvL/5N2eb4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=NC317CAxfw2i1zzcy8a7OXDng2Q6F2u/rGB5gfVHgoM+5LVfk91AfAWNxZBDCML0yKiASGspw0Bg7zYcKTyZZ53tnhx6kjELdlNSQiD8J+Wznyl4UUsWIOWXoA7V5lGYOUxzRcgQszA7GXTRyMxqrD6lBMqXqpNarVyW67lFmJ0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=K+UjEg85; arc=none smtp.client-ip=198.175.65.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="K+UjEg85" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1772440520; x=1803976520; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=/BOBhEcg95C5nY4rWf/nr71tGDfJMBQ0LFvL/5N2eb4=; b=K+UjEg85oSoHkfcglwtxJ2TKdpEKaXbPAIyMKREOwTvq2VcoKdJo8Oaw juS8O4qZRtf3SVo1SndjtUjwOKkhFg7AHlCJEP83CrQsn+OG7YPhCx0Yx m1jb3R1qY4rfmwK/m4R8G0CtXt0GK2uWqd/X/5w4cPw5MmUUpjn+XrOzh LehyCDV9BFcgO1iYomhMsPm0nI6Bf+v6iobhxdzTGsA1oRcEo10C8uzos fye/R0HS/UzLGQOk0JcRn1xgoTJQrQjeBdDVKhWLjNQp++0f7iWIGsOiu Wr+IgWmbb6T2J0A6+rpakNgeJSfA6/s9yDMRPTHSAv6wgfP4RF/6cQ4SV g==; X-CSE-ConnectionGUID: 8qfhGoDhQySLH6k15Mtzdg== X-CSE-MsgGUID: 3dmipgU6TWiZSi3OS6MP1w== X-IronPort-AV: E=McAfee;i="6800,10657,11716"; a="73309831" X-IronPort-AV: E=Sophos;i="6.21,319,1763452800"; d="scan'208";a="73309831" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Mar 2026 00:35:12 -0800 X-CSE-ConnectionGUID: UAZ8A85ZSs68YPKBEfRfcw== X-CSE-MsgGUID: kQgPePaLQgyaKbT+/0DJvA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,319,1763452800"; d="scan'208";a="214827881" Received: from dalessan-mobl3.ger.corp.intel.com (HELO localhost) ([10.245.244.52]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Mar 2026 00:35:08 -0800 Date: Mon, 2 Mar 2026 10:35:05 +0200 From: Andy Shevchenko To: Jason Xing Cc: akpm@linux-foundation.org, axboe@kernel.dk, michel.dagenais@polymtl.ca, richardj_moore@uk.ibm.com, bob@watson.ibm.com, karim@opersys.com, zanussi@us.ibm.com, linux-kernel@vger.kernel.org, Jason Xing Subject: Re: [PATCH] MAINTAINERS: add RELAY entry Message-ID: References: <20260301020902.56476-1-kerneljasonxing@gmail.com> 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-Disposition: inline In-Reply-To: <20260301020902.56476-1-kerneljasonxing@gmail.com> Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo On Sun, Mar 01, 2026 at 10:09:02AM +0800, Jason Xing wrote: > RELAYFS was originally developed by Tom Zanussi and Karim > Yaghmour in 2005[1]. Jens Axboe converted it from filesystem > into a generic API in 2006[2] and made it widely known through > the notable I/O tracing tool blktrace. In the decade, there remain > a few users scatterred across different subsystems, like recently > added wifi commit[3] that is an example to show how to communicate > between users and kernel. Last year I've already done some > maintenance and added/corrected some diagnostic counters. > > At Tencent, we internally maintain RELAY as one of most crucial > components of network observibility platform which was shared a > bit at LPC 2025[4][5] and hopefully will be published in the paper > this year. RELAY has proven highly efficient due to its inherent > design essence. This design becomes the indispensable way to build > a 7x24 platform monitoring various hot paths even without any > selectively sampling (yes, sampling is commonly used to avoid the > overall performance degradation). One of the recommended usages is > use its zerocopy function relay_reserve() to transfer data in a > raw format that can be recognized and parsed by the corresponding > application to userspace without introducing heavy locks and > complicated logic that appears in other types of approaches, like > printk. More details can be discovered by reading through the > Documentation :) > > Credits are given to the all the contributors and reviewers for > RELAY/RELAYFS in the past and future! Many thanks! > > [1]: commit e82894f84dbb ("[PATCH] relayfs") > [2]: commit b86ff981a825 ("[PATCH] relay: migrate from relayfs to > a generic relay API") It's better to read as a single line here [2]: commit b86ff981a825 ("[PATCH] relay: migrate from relayfs to > a generic relay API") OR you can even have it as a proper Link tag: Link: https://git.kernel.org/torvalds/c/b86ff981a825 [2] Same for the rest. > [3]: commit c1bf6959dd81 ("wifi: ath11k: Register relayfs entries > for CFR dump") > [4]: https://lpc.events/event/19/contributions/2055/ > [5]: https://lpc.events/event/19/contributions/2010/ > Note, when converting to Link tags the above, this blank line should be removed. > Acked-by: Andrew Morton > Signed-off-by: Jason Xing -- With Best Regards, Andy Shevchenko