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 803093B52FA for ; Tue, 29 Sep 2026 21:28:18 +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=1790717299; cv=none; b=Ui4TBaAiS8GG3WVTY0qVgjbYGi2toGGlW8Jns+DEX51RmlXVZiwoEiwYSk9+S7csbD/luAXvxu4ye60yjkMGqL+HOEhU+7Nrz+uihq9MIuTwZ2h1JU0B/LOKK6fSTQlgwcgBIUf+9eqwLazh5fpgJTwLyh+lwkduMA9I8x1eB3k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790717299; c=relaxed/simple; bh=WOBr8e4QjE5d/4EmnKX4eEt9m09mgwiLDcu5nRtOQgM=; h=From:Subject:To:Cc:In-Reply-To:References:Content-Type:Date: Message-Id; b=kYFPsVvqbJ8qx3iqqUnjRJBjpT8O4/Q29znx4Pb//ZR02pkK6Az3hh4crlxcAi683+aHiGyKpw360DMm3ubsqnwVYnC2NAnSOk+wv1Yu0TXKn6j6M9bum6ZgANCnKFuIf+iPF1kkgrVfF3sikuoUpBVS3syUM/ylivIaQ4JQBv0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XKMA6zDX; 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="XKMA6zDX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 05A851F000FF; Tue, 29 Sep 2026 21:28:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790717298; bh=WOBr8e4QjE5d/4EmnKX4eEt9m09mgwiLDcu5nRtOQgM=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=XKMA6zDXC4x+3URyztOHl3huX549ziPMTktN50hTDsuM3u5dsIlAaW+B/3Y32yRxy Mj8qjZekr2+FSxSqSqWNiaHngNt5KDkjp2hOE07q+sSoEvO4NWv8C5GN7xjdNc0cRT lKCEjo31ocVJvDCN6tIJLycQQtlrLYZZcpMEjTJA0TayXJONffFQhwcvTXrZxDoTkZ 8fAkPM3PHanc/H7CNpp5l+mUNKW2q7wXZyWnY3rW+eb9Fhx3IjvVQqQez1AuUPIdNk Qa/vA+Ra67FPGWa17sZm5hSOPWT4lib2v5Bf16MxxrQo9vPjpnCgT3JYkedePCpVNM 5r5G3VpaJWihA== From: sashiko-bot@kernel.org Subject: Re: [PATCH 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: <20260929212246.2532021-6-acme@kernel.org> References: <20260929212246.2532021-1-acme@kernel.org> <20260929212246.2532021-6-acme@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 29 Sep 2026 21:28:17 +0000 Message-Id: <20260929212818.05A851F000FF@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 > hash 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/20260929212246.2532= 021-1-acme@kernel.org?part=3D5