From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) (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 E36F74F30D9; Fri, 4 Sep 2026 18:10:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788545414; cv=none; b=Zf7v2e5vFPQMDIqLbrnJMlvzh7z7pHvhj4IgNzHK2fYNilUJ1X7jHWG6U3zNIj1eXaG3uOnljyPfEN9xJbd7/GuXqkjkI7OsoATtx7sPVM6BK67zifFF4J/gKUeCeZpTCS97R8plrWWxJRCsT2wRVJE5NQQ9TWvbLBhQlVgexHI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788545414; c=relaxed/simple; bh=1BW3bwgOiRNceiGoe+qvTekIVM9YcjPMsg4n6XnpGY0=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=uqzqvgu0agzD8Wpkm454Nf4Kfn86WED9+qdk79lbsPbYClFeRbhb3KO1urTPEf9nq5DiAl11l74824sXuGgFM9t/eME+tHTgmzdeYh2W70ASn2Ran5bojtBIN2nj77KjJehLjWEh4Z6fHvbwDLQsmHWPripyusBiOBnIa9H4JBU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; dkim=pass (1024-bit key) header.d=goodmis.org header.i=@goodmis.org header.b=1A8ZjVWR; arc=none smtp.client-ip=216.40.44.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=goodmis.org header.i=@goodmis.org header.b="1A8ZjVWR" Received: from omf16.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 758B214015C; Fri, 4 Sep 2026 18:09:57 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf16.hostedemail.com (Postfix) with ESMTPA id 504002000F; Fri, 4 Sep 2026 18:09:55 +0000 (UTC) Date: Fri, 4 Sep 2026 14:11:00 -0400 From: Steven Rostedt To: Vincent Donnefort Cc: mhiramat@kernel.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, kernel-team@android.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v10 0/4] ring-buffer: Fixes for subbuf resizing and persistent buffers Message-ID: <20260904141100.5225139b@gandalf.local.home> In-Reply-To: <20260904164450.1345852-1-vdonnefort@google.com> References: <20260904164450.1345852-1-vdonnefort@google.com> X-Mailer: Claws Mail 3.20.0git84 (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-Rspamd-Queue-Id: 504002000F X-Stat-Signature: xnmuhmfb7wwwtz87b75cz9jhoqxwkpwo X-Rspamd-Server: rspamout03 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX1/ZPjNKu2cDWfqPMcRFu1VWHE4gAwL9WLQ= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=goodmis.org; h=date:from:to:cc:subject:message-id:in-reply-to:references:mime-version:content-type:content-transfer-encoding; s=dkim1; bh=Sd0iZ2CuqVCZCR3NALUu9JKEU/SwN38Oj+GHyZkLxWE=; b=1A8ZjVWRJMRWlHQjN9+0CqgCt1MqxsXft/0QlG01NxvDcTJDZJewP9vWq1H97rDuvjxpV+9AHblrpIg/Q6bT++wha5fgd9hYDeLggnLu/J3GIds7+yZR/IfSfrkZh+rs7LSFwmopCYQgo3iBAiqcZQWMfTum7JJ3R/AZbkYGi7Q= X-HE-Tag: 1788545395-127414 X-HE-Meta: U2FsdGVkX1971Db5IyBVmS8H7Rdu0fN9lBBBEexQgwf63T3gXtAZcFmhI/N7xe+rqaKIS5xo3gFq2QbgEks4wbaQJqo6QW3a3nFwtLOPneHJy+v1nguQ3nEz/nKo0RHpmF+Q4BD6cxPMxOsfozAvv6dJ+0qBdGPh0GBJLcJCZJwDLfVcUvCH3b/POtL6UK2xzV7YAiytwm22jOsVnK1my3q02EZeL3uP3E3OvAhHuHtEt+y0T5aARXecexHEbsS9YDEKIrM6sMTn1SIIDDA7kEHhuwXQNFjh9ypKBmtgclD1yxxS2GQ2JORjPpJxK/0cwA+1dUnADqAEtDWAzLvhwuA0D27BLXjz On Fri, 4 Sep 2026 17:44:46 +0100 Vincent Donnefort wrote: > I have managed to reproduce a ring_buffer_read_page() race with > > $ trace-cmd record -e sched & FYI, running "trace-cmd record" as a background process is "awkward". Instead I would use the --daemonize option: ~# trace-cmd record -e sched --daemonize Send SIGINT/SIGTERM to pid 4633 to stop recording -- Steve > $ while true; do for i in 8 16 32; do echo $i > /sys/kernel/tracing/buffer_subbuf_size_kb; sleep 0.1; done; done