From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 247913B5850; Mon, 17 Aug 2026 07:54:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786953294; cv=none; b=LwMMEyh8Ht5f5X19gPgjJYkWkH/Y5siAni+VUPGytQJ16GfMfF7snYRYtC1meEUEuDBRVn84Ol3oSebpHv7u+c+lvhapsnHOJaJ9SGPHQNAL0yZZZiJkL3UhjauxtrJaN1s+dpDQjiv7vNLhp9Xhxd3831qcU3mnlYR4EYv2/qU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786953294; c=relaxed/simple; bh=4e7kIdE0zcjBnLCU7lhJyBQpJxkwx9Y21awpvSvsWVE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=FJW6buivuJjzAg1HjQuVAvdZcRByI/RmOsYzSO1rHgtCvJIGuTk+wqAkO4eNQ9aY/8wzYO4CwtvydGcLKPsy6yrDLR/D68QuzvPXLG98whQVX0hAVtXnvlbC+zPA6enceHkKWVzJAykw9AqabCa0NU0B+piy9OlIx5Ax22yaneM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oypufksR; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="oypufksR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D846E1F000E9; Mon, 17 Aug 2026 07:54:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786953292; bh=RNjpfSmzin3RnkChc90q8nEY8hKPNjfQH6/ZWx+NdXc=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=oypufksRQ816F5ciS6TjyLxTWrFjZ2q/0ahuzidm/udX3oPgdR9anETNVX83h31vQ PG/NHye9X1rch2XouSbb7r8/VTvn3nlfglvCOKtswzpZnKZEGrpNDaOh1SyeBk9m3l G8CcCYY6GhAymJvvvioWksKE6iTzQbQsVS8Lc4vUpLPw3fHL88oxGt8eQRgDWKGwTo fqc4B8zENY/F2/3lyBa/UXi3mq88zSCQM68exo4epotO+0H6Lg2WFtnMZt+6TOmBF9 RAi8EwRrRQiCb7ME3wnBisjqFgUQYJXv5uy9m3CEj69HwG1Et/l6V1riSdF7BmJygl 5fyo0L0k/E8jA== Message-ID: Date: Mon, 17 Aug 2026 09:54:47 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 0/3] perf: Add Raspberry Pi AXI PMU driver To: Ian Rogers Cc: florian.fainelli@broadcom.com, linux-perf-users@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, pbrobinson@gmail.com References: <20260815082048.4043217-1-irogers@google.com> <20260815172712.50119-1-irogers@google.com> <4998d0ca-eeb0-4b04-b3ac-a1f97c1829f2@kernel.org> <7cc71fbf-425e-4047-94c5-3f06d3ed8905@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 17/08/2026 09:46, Ian Rogers wrote: > On Mon, Aug 17, 2026 at 12:26 AM Krzysztof Kozlowski wrote: >> >> On 17/08/2026 08:57, Ian Rogers wrote: >>> On Sun, Aug 16, 2026 at 11:20 PM Krzysztof Kozlowski wrote: >>>> >>>> On 15/08/2026 19:27, Ian Rogers wrote: >>>>> Motivation & Background >>>>> ============================== >>>>> Currently, Linux lacks a standard perf-API compatible driver for the >>>>> Broadcom AXI performance counter blocks on Raspberry Pi platforms. Prior >>>>> out-of-tree vendor solutions relied on custom debugfs nodes and ad-hoc >>>>> kthreads, preventing integration with standard Linux perf tooling (`perf stat`, >>>>> `perf list`, etc.). >>>>> >>>> >>>> Slow down! >>>> >>>> One version per 24h in normal cycle, not 13 patchsets in two days! (and >>>> even rarer during the merge window) >>> >>> I'm familiar with perf-tools which was set up to follow BPF's example, >>> both have -next repos. The -next repos merge into linux-next for >>> testing. I agree that cherry-picking shouldn't be done straight into a >>> pull request to Linus. Is there a principle against using -next and >>> linux-next? >> >> How is this relevant? I don't think you read my comment. > > I think I addressed all the points in your email. The -next > development is relevant because it directly addresses your point about > not sending emails during a merge window. Except when the -next branch > is becoming the main branch, merging patches at will is acceptable and > you also benefit from the linux-next testing. Not sending patches 5 > times a year during the two-week merge window, it is nice to think > that this timetable fits everybody. No, next is not relevant, because I am not even speaking about applying patches. I explained you the rule of one posting per 24h. Not 5! Best regards, Krzysztof