From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) (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 4F7292D373C; Wed, 2 Jul 2025 20:10:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751487016; cv=none; b=GTuZLHEiGY6cEr783DMTWnbqoQjkjea/AVPy4P507XQtIUAmAWTZLwUl5lHrTjh+K2M2/uoHG/i4d+gOoWxuBYfiHHGJYwduCuweGQb6jdMiirm9U4eTvjdaUXITVuTnt9jq6tFatIC237NP63OokMh3zqfWZqjQ6WzF0n/cx8o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751487016; c=relaxed/simple; bh=nzLtOk+CXiy19j1c+qXN2YOSaypKxf6gyl1O+1Hw96k=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=kiqZAt9lZxb63Ik3LgOEYIKwrV9onx+q4DoUc2Bg7XcMCkiFN3GcBymlNGRoWS5w6uQ6XULCyoYPSmVQ2im3v3KTlBST93ssR2RpOCed6XNeol40h86nx04dVlo9YajKu9F091h8yZKdu6yJuT6LtDAUPCrAUqOtlP7Xzp3pZa8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 79491C0464; Wed, 2 Jul 2025 20:10:11 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf13.hostedemail.com (Postfix) with ESMTPA id 25BFB2000E; Wed, 2 Jul 2025 20:10:07 +0000 (UTC) Date: Wed, 2 Jul 2025 16:10:05 -0400 From: Steven Rostedt To: Mathieu Desnoyers Cc: Linus Torvalds , Peter Zijlstra , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, x86@kernel.org, Masami Hiramatsu , Josh Poimboeuf , Ingo Molnar , Jiri Olsa , Namhyung Kim , Thomas Gleixner , Andrii Nakryiko , Indu Bhagat , "Jose E. Marchesi" , Beau Belgrave , Jens Remus , Andrew Morton , Jens Axboe , Florian Weimer Subject: Re: [PATCH v12 06/14] unwind_user/deferred: Add deferred unwinding interface Message-ID: <20250702161005.0ed06389@batman.local.home> In-Reply-To: <16b8f9a8-b1f8-43ac-9dad-4b83d8ca9f9f@efficios.com> References: <20250701005321.942306427@goodmis.org> <20250701005451.571473750@goodmis.org> <20250702163609.GR1613200@noisy.programming.kicks-ass.net> <20250702124216.4668826a@batman.local.home> <20250702132605.6c79c1ec@batman.local.home> <20250702134850.254cec76@batman.local.home> <482f6b76-6086-47da-a3cf-d57106bdcb39@efficios.com> <20250702150535.7d2596df@batman.local.home> <47a43d27-7eac-4f88-a783-afdd3a97bb11@efficios.com> <20250702152111.1bec7214@batman.local.home> <20250702153600.28dcf1e3@batman.local.home> <20250702154048.71c5a63d@batman.local.home> <16b8f9a8-b1f8-43ac-9dad-4b83d8ca9f9f@efficios.com> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: 9h9bqzrzn8kj7pqoe7o7tdions79fckj X-Rspamd-Server: rspamout03 X-Rspamd-Queue-Id: 25BFB2000E X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX18bEf0NTakmzstSfpVPMrAT7yaOXg6Xl6E= X-HE-Tag: 1751487007-9541 X-HE-Meta: U2FsdGVkX18YhDIwOmvt7Nq3GZemF2igDaPgUIAFQzyiTZ4jbqKL1zC8HHre1kjHbJLFH62lIHgDE3EMN41B1+Gl3vXap2n8H5+75xJXqCPhI8c0CvE43eN8FTLYolsqwnBa9R0zOvyv2+PfFNa0Tv/jwuMvoo4bDTyKfH1mhO7mtClbtGqZVSxZX95KBG94aXPU0RbxwGbXzNSGnac3v/ZK9/+i2F+at96jJhteB5dGzzIxQrCblbThzASRkLqZnhi4ps8Lhf3piHyWgtdi3SRloGcnqMrMws0kmLvTfwHsUkWWAKc0HnuZNGTx2714nbDmgFaY1+I9DsnKIUkT919ni3uckgdAl43kR6LPbTXYp5SatiNtXdnNKxwfJicf On Wed, 2 Jul 2025 15:48:16 -0400 Mathieu Desnoyers wrote: > FWIW, I liked your idea of making the cookie 64-bit with: > > - 32-bit cpu number, > - 32-bit per-CPU free running counter. > > This is simple, works on 32-bit archs, and it does not overflow as often > as time LSB because it counts execution contexts. I have no problem with implementing that. But Linus had his concerns. If he's OK with that version, then I'll go with that. -- Steve