From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f47.google.com (mail-pj1-f47.google.com [209.85.216.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1AA0729E11A for ; Tue, 18 Aug 2026 22:31:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787092295; cv=none; b=DJ7cOQ/WhcMPVpSNqrg1f/IbeItKRv2tWjY6Mhi2H17w75YIdr1m2mIkFow3284MGVsoW7DclNOCYWQM+yV6eXT7H/ijitfNttn3vJH1IDJ4zCuhS1qq2cinFWmsNpzesZ93ELrlWVmaWWLeZc/cQf3ytoosVXtJoZAMrNVi3CU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787092295; c=relaxed/simple; bh=uuQkTIjteO35Ck9wft7z8E25w0ojFQnZ5h0DvgiWKa4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=OR9L0ci/8odUaJsjfGcd2N4G/Be4bLycQcKyI5zGcSoNnY9lzgSLjsfaf4pRudoYu6FFeO3EPD+N1058hgunnVW3EdPcKj0V83iMioBitBCungZipxcGxyxOPxjVNzpsXjQJh7UPCpDNP5AU2l+u8fc6sDF7bUlIjAWw6JKeFOI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=s/A5qmfb; arc=none smtp.client-ip=209.85.216.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="s/A5qmfb" Received: by mail-pj1-f47.google.com with SMTP id 98e67ed59e1d1-381b831d535so664342a91.0 for ; Tue, 18 Aug 2026 15:31:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1787092293; x=1787697093; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=EFl0Ov2rpc3xev/n5APT5V/efpbjI8Ad2gYSG/EUGz0=; b=s/A5qmfbuM+5ecriHmwzNPk4HIcLd+JECC9r2BEWPEHoIA7Tm8ve+21b9T6s9gpkga OJa2uKTSnLIQZOvUihDOiHo9sgNGKdwWzjoy74s3vGW5fxnoLXSNV7zjgIRnSW0ipRjM HtpXOJuKrNZAp+1IOFEm8GK5ne01k6KgKLGN69AxRqW56cRUOdM+zGbaZ321KEdvu20C QhbX4qDq2I+gjeCV8/P8IvlUFWJfGafqzHr+u/ZauF+F+0u5BTDZs6FdhMuRLTH2RRXy IzGmNAd5OLK/npqItfncg+b9R6Bbx5c/Bq+J3qXmFHzEVb5wY41BO4xKJnbhsdhYXOFO oRdQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787092293; x=1787697093; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=EFl0Ov2rpc3xev/n5APT5V/efpbjI8Ad2gYSG/EUGz0=; b=VgAYh4NFuiP+5Fg0PSjT/y0kQxgviWmYYg0w17nF+51Vubl2GPu6VZsZ9Buf61MO7a nHTb5zpEqR3pTHSrJOKiolI+yltq3iyunzp7X51RSizytYr3nFCaQSL/iXHHpoAlUXKW owcIOQy+YPvofz+zNFWvASY2i/rMMD5dj24X5NVCqlQJzeE7aJNTiLPU0Fxhif85uuJH SvqpMMP8mvMewMAuAOLwtC4QMF5Orhkfj2M4aMdssd0yPs8ffO9RiEJUTr7PwpaARWBl 4i7lV/AH+nmiJe5LJkSeaYCVr0cprTZ0zjUhCxOijC6Hs6isJrH/CKluvFEzO0AMrbKU Kitw== X-Forwarded-Encrypted: i=1; AHgh+Rqu2TmB32+6d8lLAIMJzp6dJOYSsCoaa9Y8PX4rcpZi4lYS2Nkj5GOEOTNPd1Cf97ke/THxU2Kkf6G+pNc=@vger.kernel.org X-Gm-Message-State: AOJu0Yzt0YuuUPxbkVSts8L0AFsjgJUlMfAQ5nvJUGyRDTkIsCOfuNpz MO4og7aYOGog8jClcigpa4GovtZLdbg4mOPos/wKIwaebpf69sK6CEoB X-Gm-Gg: AR+sD10WAj42OinXJ36U4mdR+5LViCf0liYdFvVCISBkX7TVsOYkmnr0hUa3h8b3bRh 7v2PZOfe/v6qOUuGbwpmK04UChNCMZY16wZ5FHqgPTExD3RJH3+vrvca0hce+D4CI4fC9gksJ/L JXjxhMjLseVgD8pUg9mcjMrF/F9fCL0/PFfi0JDAr0NrrCxvRRTa8ZLgAV1bwfDMge0lrrt7PVm cRdzQWAHouHnqdNLtNb59S9EGpgMkmtH8SU0G0H1x4tjZT1iI2OZ5x9UFQ6X1mHTuJCUzYsReD8 XikPicPu31Xes1JIIdBHZrY0yMdgot5JCfmchUnmLbk6PzQOSJ4rfNcQW+oQGOMxbAkl9LAIuYI 47jIdvijTeZRaDdav2jCMWgTeEVYB9xgqOWALiI1yBtO7C1kMYKCcs8KtuTs5q9D81yDuo9VtUT lz6VcaNf7K1ptyu6843cB2PkSBBYumhdoKQJ2OJBuEToXFtIvmolig2o1DmoWpozSD208/+M+Ca 5DBWA/t X-Received: by 2002:a17:90b:2685:b0:395:7fff:a08f with SMTP id 98e67ed59e1d1-3958049d47bmr482556a91.0.1787092293365; Tue, 18 Aug 2026 15:31:33 -0700 (PDT) Received: from devvm16600.scu0.facebook.com ([2a03:2880:9ff:40::]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1416ae14162sm404407c88.9.2026.08.18.15.31.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Aug 2026 15:31:32 -0700 (PDT) Date: Tue, 18 Aug 2026 15:31:29 -0700 From: Ziyang Men To: Tejun Heo Cc: kernel-team@meta.com, Jens Axboe , Josef Bacik , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Shuah Khan , Johannes Weiner , Michal =?iso-8859-1?Q?Koutn=FD?= , Roman Gushchin , Shakeel Butt , JP Kobryn , Mykola Lysenko , linux-block@vger.kernel.org, bpf@vger.kernel.org, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 1/2] block: add BPF kfuncs to read blkcg io.stat Message-ID: References: <20260817214205.723267-1-ziyang.meme@gmail.com> <20260817214205.723267-2-ziyang.meme@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; format=flowed Content-Disposition: inline In-Reply-To: Hi Tejun, On Tue, Aug 18, 2026 at 07:21:37AM -1000, Tejun Heo wrote: >Hello, > >On Mon, Aug 17, 2026 at 02:42:04PM -0700, Ziyang Men wrote: >> +/** >> + * bpf_blkcg_flush_stats - Flush a block cgroup's io statistics >> + * @cgrp: cgroup to flush >> + * >> + * Propagate I/O statistics up the cgroup tree. Root statistics come from >> + * block devices and include all cgroups' I/O. >> + */ >> +__bpf_kfunc void bpf_blkcg_flush_stats(struct cgroup *cgrp) > >Either @css or @blkcg, probably the latter so that each operation doesn't >have to verify subsys again. I'd make this and the cpu ppatches into a >single series. Add blkcg cast there too. Ok I will add the casts bpf_get_blkcg() and bpf_put_blkcg(), and remove the check of css->ss in above functoins. Next submission of this series will be together with the cpu one. > >Thanks. > >-- >tejun Thanks for your review! Best, Ziyang