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 CE2DD3CB2CF for ; Wed, 30 Sep 2026 22:05:15 +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=1790805916; cv=none; b=eENvjVQCUpnC+yv/IlnR4TElS/HJoEeh5oZMGDxzsMTfaFylj1p5/oWkcO0Z+uR86R+IIKc2QpgIUCHAeIDqguFBa2Hw8C6N0Le9hj7pye1i1ecmFuZDnLtPJ2q/jyJC7tifmYzGxc6isQe13lkvM3iUQNpVGBZxT8qi1XlP9fE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790805916; c=relaxed/simple; bh=bI32wEny4vk5mri+r5lioAWcQrrc4wN6FEbk4Xax2pk=; h=From:Subject:To:Cc:In-Reply-To:References:Content-Type:Date: Message-Id; b=JZ9KjiDKZtjxrxNbgdOl4ioU7hcQzGp8krekGr8kiD5+2nhBwflKLLmo59QudB1L5ES/vpNdcVClEkqiUoRn0IRsVaa7mWSQ5PEr7ue5g0Nkj3fi9B9GaTR90yfwk79uQudvvMyFh8BYbNN6FthB6gOwkEtmLOnqJzs7v2SssE0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oXirVYOL; 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="oXirVYOL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4A7781F000FF; Wed, 30 Sep 2026 22:05:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790805915; bh=bI32wEny4vk5mri+r5lioAWcQrrc4wN6FEbk4Xax2pk=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=oXirVYOLenrVz7ea5uS2IFtvDzIw7ar/GRl30qr7Rq2HGjjvlkXHCvR/USyHNAFq3 fvEZHuDcgGgpCKfGIrJNDfbEsNydBBCZeo4q/FhMKEmbKle/3yq1BarCgGq+xOsXJn HsTRjqmQY98Q6CmWhKEzZFv6ybvOo3rJ1a6ZkXPb1zf/w63hIFVE3QuDYX53r137kc rZv44WJMcn5OXgiFy1Hkx1nSKsHdJNQCuP7l3sruwBRBJCXjaSJt4CpS9FdS1ybuOb 1F9k0/HUCL03NnobMBLWaI5OXLO61Vkq5XeiFVsn/8rWakOTMAwbI1yWVRPc4cK5W7 ZxPbZKC7zIfBw== From: sashiko-bot@kernel.org Subject: Re: [PATCH v6 5/5] perf test: Add false_sharing workload exhibiting cross-CPU false sharing Reply-To: sashiko-reviews@lists.linux.dev To: "Arnaldo Carvalho de Melo" Cc: linux-perf-users@vger.kernel.org In-Reply-To: <20260930213716.2633750-6-acme@kernel.org> References: <20260930213716.2633750-1-acme@kernel.org> <20260930213716.2633750-6-acme@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Wed, 30 Sep 2026 22:05:14 +0000 Message-Id: <20260930220515.4A7781F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: > From: Arnaldo Carvalho de Melo >=20 > Add a 'perf test -w false_sharing' workload that hammers one shared > struct from several CPUs, shaped as a TCP connection: a read-mostly > identity (five-tuple) shares a cacheline with per-packet rx counters > (the false-sharing line), a second line has packet-path private tx and > congestion control counters, and a third the connection config. >=20 > The packet path runs in the main thread and up to four lookup threads > sum the five-tuple and pull the config, reading one volatile shared > instance directly so the accesses are PC-relative and resolvable by the > data type profiler. >=20 > Assisted-by: LLM > Signed-off-by: Arnaldo Carvalho de Melo Sashiko has reviewed this patch and found no issues. It looks great! --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260930213716.2633= 750-1-acme@kernel.org?part=3D5