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 8597A33F8A1; Thu, 4 Jun 2026 21:49:32 +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=1780609773; cv=none; b=PW3+4lsxpxRF3BrQnHQJwTD8SXzAOVR09sneMXj9h/UkAzNoasbjFtdOi4BsdAGuRbsOZfuOGPgxyTnDAz4v8alkEaarlbseV8CQDSdgl0omkiv8xMEj4m5ci0PUfeJ2tKms5ggPJStf+dypguov5ldUIiCK/0uREmQ2NEteUfs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780609773; c=relaxed/simple; bh=sFcNX4wzNfQIligz+Bj9mKw0+HVTQx9uBEqxL+Ycsdw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=L4FkIuaCFG1XBN40Z9QwKpLoNyGAUGDSrZkDhbZ49VhgbuizpzlG/Gu3kShybeIQS6D29MgIDFBRIgxdvvNdzrjpiWeHqbJQmoS6/knJaDROKX9t00WshAiT1TxngSXIl3TeP5FFdTVToPCjgM7M4k7C3tV7GOJBMuVSXkLcdfk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AeNrLJq8; 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="AeNrLJq8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 213891F00893; Thu, 4 Jun 2026 21:49:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780609772; bh=uuI0EPIlpwFgjFIkqr01k2NHIDzpzpZfixXgCqozEIs=; h=From:To:Cc:Subject:Date; b=AeNrLJq8Xy7RvNAlEvqGajzwbmoTwCa4JUe2sHkZu30FrI0jM5HsvfVxdZv9Yn44h THU3KmMrxESLu4ydDq4PpOJVFGPTeFYaIcgqnq+9iR4zxWYdhy/RHv0aJcF5tDwDLw qN94FQJ5O70PgEN+xqR2HsXrVR07EMYifLFc3vTgSYcIRNQTL7xooZOAbuyXi0RZYm llCjiNNYmrSmMvJPhlevznO4p3zig3JNsVBe45vak30lJdgp53Fd0f4n0N8H+38Z+u S/fvXSQbQSpRwxk2LAeXA+PtrfvwK1uJfMmUpJgizVpwjRICCVMiGvw4UuVSoKXHxc EXPtv8JmP8NIw== From: Namhyung Kim To: Arnaldo Carvalho de Melo Cc: Ian Rogers , Jiri Olsa , Adrian Hunter , James Clark , Peter Zijlstra , Ingo Molnar , LKML , linux-perf-users@vger.kernel.org Subject: [PATCH v2 0/4] perf timechart: Small optimization for backtrace Date: Thu, 4 Jun 2026 14:49:26 -0700 Message-ID: <20260604214931.2202322-1-namhyung@kernel.org> X-Mailer: git-send-email 2.54.0.1032.g2f8565e1d1-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hello, I found an issue int timechart backtrace handling during the last review. The goal is to reduce unnecessary work in generating backtrace string. v2 changes) * fix memory leaks when backtrace is not used * copy backtrace when it's used twice Thanks, Namhyung Namhyung Kim (4): perf timechart: Don't pass @event to cat_backtrace() perf timechart: Generate backtrace only if needed perf timechart: Remove unused backtrace in trace_handler perf timechart: Remove unnecessary copy of backtrace tools/perf/builtin-timechart.c | 107 ++++++++++++++++----------------- 1 file changed, 52 insertions(+), 55 deletions(-) -- 2.54.0.1032.g2f8565e1d1-goog