From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 E70DF28C01E; Tue, 19 Aug 2025 19:17:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755631079; cv=none; b=lVLvjCb+ovj7dfOr878+F/Z5uohDBFwBBtY/sk2pHsxHErWkaeMFvDoaXpObzB8DLGXNw9QKTLxuHEtaeNM+9l/yCtPioYVTCpVRW9s2bEiXAo3VonPMqUPATecFPlFu5PWBEzvKCLZewtfTajuwqoQWWhviqV9aH4jf721WONk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755631079; c=relaxed/simple; bh=8VUS3MNjijYEEqUa9MHAfh0tD+Axljmg+OjHaNQW6g8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=sTPJohUoLlQAcqQ7JguHH1ZN0irCskrhjypJ88+6Guy56otyZDPA1kVpMleL23ywZJhqF5XOrQ5+IE0fRFb+uBDWEFOHC66QWcVmRbN4guiCmY30DrVbWKzlO1oIluKAhgZSdJvpsttqXqI0m+Kg1nNCuHkPB8LV8LG5eCBUSUw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=dqS8uZ80; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="dqS8uZ80" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=8VUS3MNjijYEEqUa9MHAfh0tD+Axljmg+OjHaNQW6g8=; b=dqS8uZ80Rk5tXFFCRB5CZq50gx lv7ZulxCqtHX0Ya6L+PdbUsphJ+np2C37VfzeRXt0AZ41r0c/x+UcWCE7ZTFP/f1g9rPg4fuZTmA0 SFLS/yaav4eEd3FhEqsqCiejUQSsLSgR0U5aDcW4nKQh5/zBf4NWW3Fxj3K8LmstHqzYDcB/x/5wz o8BmyHwAPiyEICvV1jvXExtVLevQm96UhMxtIyIb01sXmSzNGw9Cpo3nA7cE7CpbYCC1ykhP+ptPP wjnFVmKLOm9VkvN9mqnygfxT+Jukw0L56xuDEaEYPagGRJosc3IcTf0PcLzU3SeNk9E6zANh/SaiB FqZC5Pww==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1uoRq5-000000005WP-0Ziq; Tue, 19 Aug 2025 19:17:45 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 1577F30036F; Tue, 19 Aug 2025 21:17:44 +0200 (CEST) Date: Tue, 19 Aug 2025 21:17:44 +0200 From: Peter Zijlstra To: Jiri Olsa Cc: Masami Hiramatsu , Oleg Nesterov , Andrii Nakryiko , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Song Liu , Yonghong Song , John Fastabend , Hao Luo , Steven Rostedt , Alan Maguire , David Laight , Thomas =?iso-8859-1?Q?Wei=DFschuh?= , Ingo Molnar Subject: Re: [PATCHv6 perf/core 10/22] uprobes/x86: Add support to optimize uprobes Message-ID: <20250819191744.GN3289052@noisy.programming.kicks-ass.net> References: <20250720112133.244369-1-jolsa@kernel.org> <20250720112133.244369-11-jolsa@kernel.org> <20250725191318.554f2f3afe27584e03a0eaa2@kernel.org> Precedence: bulk X-Mailing-List: bpf@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: On Mon, Jul 28, 2025 at 11:34:56PM +0200, Jiri Olsa wrote: > Peter, do you have more comments? I'm not really a fan of this syscall is faster than exception stuff. Yes it is for current hardware, but I suspect much of this will be a maintenance burden 'soon'. Anyway, I'll queue the patches tomorrow. I think the shadow stack thing wants fixing though. The rest we can prod at whenever.