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 49B2D4052A6; Sun, 4 Oct 2026 22:09:39 +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=1791151780; cv=none; b=BjQWxIyvLkJ0w6P/4M/Ht4TRdcV1Ob/ILuDaVsivUlrggp0MMOnGet+WUL23Y/b85HritZS2FKEcG2kwsN8+nxalu4WJcW4BnnM+trlQaTVsxxjHm3x87CGnXdt3bCi4m4PfVtrl1wqdngp1N14MzwE6GbqtY3y4L3425Vkg13I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791151780; c=relaxed/simple; bh=wZg6gNnwTQANLDOqqjE0yli5GKAXyhPwZzpTVfy+1wI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Q2N/C7Oz63IjSY8rm247Z5Iyj0hByCJz0+Gx+uQnAqWpjvdAnu4cdsF+TQ7EqAJsNashfRm9ITagp0orE4rlWYMqn9pRH46IA0WRRqs1dKxn59ETYsX4h8DVv3yNuqjDn32pC4TYa3/a97anD+7IIsvdcudeuLxdr9vY5zh8Ckc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RbZJVM4a; 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="RbZJVM4a" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BCDDA1F00893; Sun, 4 Oct 2026 22:09:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791151779; bh=CIysZCZmDY+hsmraxBJHQH/HCXeMIwx5nXj3FwnpnSI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=RbZJVM4aJi45z4MD6FnfIIwGAZCzBlIK2SKaDsBl8ypr7Tk53Qis+r/5UedLY+0Xa 5MTaU7LSg0MsWm8HkKGlPyaOZM0MoHliMPdi3TZiG88ToSEOT+u4DjhSNXqjv6LcZ8 aBgZM3o9PVTKNHRHvUoRRmtZCV42Z2Bf2O0Aq0OF6NnRsndGAIx86Tpm1iEAmS3kCF FbmPZZW2KdsFJ6nU6fu0Y2U5ff4DmLaeJiboUxUdXZ9oj4pGagrE+AdN9Idyp0pSpZ tDGr4geVL0YIiwGrIZCFVjzJgUmup98Ibw7OQf+JxYbrCk0tNgDh87JN8DCFuEZHaV c4Rqs044oq/rQ== From: Will Deacon To: Peter Zijlstra , Ingo Molnar , Suzuki K Poulose , Mark Rutland , Adrian Hunter , James Clark , Mike Leach , Tamas Petz , Tamas Zsoldos , Leo Yan Cc: catalin.marinas@arm.com, kernel-team@android.com, Will Deacon , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org Subject: Re: [PATCH 0/3] perf: Suppress redundant ITRACE start records for Arm SPE and CoreSight Date: Sun, 4 Oct 2026 23:09:16 +0100 Message-ID: <179113376395.1496517.2313914567669442516.b4-ty@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260901-perf_suppress_itrace_start_records-v1-0-c4fbc6860859@arm.com> References: <20260901-perf_suppress_itrace_start_records-v1-0-c4fbc6860859@arm.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit On Tue, 01 Sep 2026 17:36:14 +0100, Leo Yan wrote: > Thanks to Tamas Petz for noticing that Arm CoreSight perf data can contain > many PERF_RECORD_ITRACE_START records. > > PERF_RECORD_ITRACE_START provides the decoder with the initial thread > context when that information is absent from the trace stream. Once > tracing has started, Arm SPE and CoreSight decoders track subsequent > context changes using context packets or recorded sched_switch events. > > [...] Applied to arm64 (for-next/perf), thanks! [1/3] perf/core: Export perf_event_itrace_started() https://git.kernel.org/arm64/c/ce512db53e0d [2/3] perf: arm_spe: Suppress redundant ITRACE start records https://git.kernel.org/arm64/c/87f78017e8c8 [3/3] coresight: perf: Suppress ITRACE start records https://git.kernel.org/arm64/c/8f8301eaa400 Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev