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 C410F26FD9B; Sun, 13 Sep 2026 21:45:40 +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=1789335941; cv=none; b=sbhRXjxkXCfSK/22LiuqBr4gtcJAXLOTtj7NJb2KSxLsomaMOX+XMIkVjhhy/j/7rxCkubVK6CjjRBuEjtZ8mU+qbpMb5RZJskgMV3am/auI7Z6AEvKk/fA/74lfPxHQt26hNE2THN9PVzbhRdZZPGeh0eIhmMkHVo/FhwWYAyI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789335941; c=relaxed/simple; bh=kozrj0ZnEsmTVum2FV1VdqXGVuxjfN0MqSTS14MQb3w=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ACiMFMV3uyM4OGCThJdwPGpimyX44NeT680syr+5yuMpexTl6B4lqdH+OG0mgRkBqUrgOPL9dsikavVPUU2O42eO90AX9D2KsojMmrpoZW14J8Tst5qJMKoZR0S2eS4dI7zyFB0H1zk6IVisRditUp3OTfiuierOfzpbAUq16hU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fosl6tpG; 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="fosl6tpG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CE6821F000FF; Sun, 13 Sep 2026 21:45:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789335940; bh=kozrj0ZnEsmTVum2FV1VdqXGVuxjfN0MqSTS14MQb3w=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=fosl6tpGQ1QE8AWfBWO9Qgs0yfpzhSSORLzssGHAocSFBF3kt+VV4vcHTvMsfdwjn pTrQo/3uxXgAdHslAej6wTO/1ZVh1Yx1tN8R5Xuld20hn2ueEZzdq0CWJbcT/4ghhP 8Fw07bjt9FBBo0m1ibM2+2Pp5d4escM0txj0M1j/PSxeRcc0JI1039VfACqP4pKUP5 EdE2x4rVCZIN24tZAvi336XkqloOs3itiWDZpEyu5cOO8aC104NeFOsgjlDaaVhI3f 8dtoDMfQQvGQiiEIO8DYqWPj5TaH36/1TIGce7liydZkZpe/IBjEmzKOrCbYrTLzGH EF/mhuUh+WtxA== Date: Sun, 13 Sep 2026 18:45:36 -0300 From: Arnaldo Carvalho de Melo To: Qerogram Cc: namhyung@kernel.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, irogers@google.com Subject: Re: [PATCH perf-tools-next] perf list: Avoid repeated strlen when escaping JSON strings Message-ID: References: <20260910123839.72285-1-qerogram@naver.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=us-ascii Content-Disposition: inline In-Reply-To: <20260910123839.72285-1-qerogram@naver.com> On Thu, Sep 10, 2026 at 09:38:39PM +0900, Qerogram wrote: > The %S conversion in fix_escape_fprintf() calls strlen(s) in the loop > condition while escaping each character. GCC 14.2.0 retains this call > inside the loop in a normal DEBUG=0 (-O3) perf build, repeatedly scanning > the whole string. Thanks, applied to perf-tools-next, for v7.4. - Arnaldo