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 4773E217F27 for ; Tue, 13 Oct 2026 13:11:09 +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=1791897071; cv=none; b=S3bevAVS0CQE/LtqNMZGsqtsrIh9H6JjiC4qWphOv42cL3J6cCdCp3ZkjLTXJP//rPg1HPWRI4JLC4qVj+8tbjPX/pD8u2mz9nMBsT7JldAfZQgKWCbaDoVLjxy2dWz9NP86rL9nXfclerdnYIZFgWzZGyryVPHwDz/DumA2Mu4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791897071; c=relaxed/simple; bh=fJw9pCo77lKC0NdVF8cUo7RPug6kkE4rHMIEfImfyKg=; h=Message-ID:From:Subject:To:In-Reply-To:References:Content-Type: Date; b=m6xTdWG8zWG4HzneRwK/3BHZFp5M3UkzhhoIHy39I9yRxyqDh3BEpBku/n+EoXs90VqdTb+ebqJwzykR3CERVsvKGPXo01R9uzdyRBuZRbdMu5CCGulFEWWHgdg3nr1W6IZye81FsEJsNd/ZmyT53mpcBGGVPUcqdS0LajpvAxo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gePKYdQp; 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="gePKYdQp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA9631F000FF; Tue, 13 Oct 2026 13:11:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791897069; bh=3NMKRPr3cwb4+AaNwirKqYh/oOwYl+JzkqrnZLuauH4=; h=From:Subject:Reply-To:To:In-Reply-To:References:Date; b=gePKYdQpD9HQfgyNHijcPZkvio6iCCUXlaXi/XvIFNIsnTxl/4ZhHgN16Fs8p5rGQ Z8PEsOJ6cM48MOCIxXpfCYcWACjY1z2qtw0zADvg+GXrxCqldjxZRv7CV2GwCMJ/TB /crNfmwMyOH4nWcRlZ17G7hB/mw594rIYtEpAuTXhDnH2n4ryRalC1jDJDne5NPyQT 6zhEu5qfVnuILRvun9Q4cwUBTIBsG1cyqgXh8ooHUBni8XAv0GDtdwXCdPp1uXCXOD EpYdAdTS6bbAqZvG2DdL8ZuNAPWWWTMRVGbiuh5hGDRB0lDlh4A3yLFRlRA3FIANw1 AekzurJL4Ad+Q== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH] perf: skip unnecessary userspace map synthesis Reply-To: sashiko-reviews@lists.linux.dev To: "Max Kellermann" , linux-perf-users@vger.kernel.org In-Reply-To: <20261013130052.3012773-1-max.kellermann@ionos.com> References: <20261013130052.3012773-1-max.kellermann@ionos.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 13 Oct 2026 13:11:09 +0000 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: > Reading `/proc/PID/task/PID/maps` for existing processes is expensive > on systems with many processes. `perf record` already allows skipping > these reads with the `--synth=3D` option, but `perf top` has no > equivalent option. >=20 > Skip userspace map synthesis by default in `record` and `top` when all > events exclude userspace and no sample feature needs user mappings. >=20 > Signed-off-by: Max Kellermann Sashiko has reviewed this patch and found no issues. It looks great! --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261013130052.3012= 773-1-max.kellermann@ionos.com?part=3D1