From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f69.google.com (mail-ej1-f69.google.com [209.85.218.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 071FB3E44F9 for ; Thu, 6 Aug 2026 21:13:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786050798; cv=none; b=KyUgguI1BL8+SpLcdTLz/2H0e4Pa+fqm+3UHqHJUGg9dmOMma5Ayk2s3uUlRPfjY1Gb/BmsCrsT6jpw1vIa9BkFea+mtQcUkuSxBjw+ka9h38cNEF9lWQA1ZY58ZLwt2rJW1Ap4UJx9k7SGoUQ5KQ2NbRDg88p/mGG/8NEW+quU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786050798; c=relaxed/simple; bh=Tggc3vrqTOr9eDO+3q+x6RDbfK5z6u/pfVFxIWyDlAI=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=DbmKOqoFQN6XBkpzuwSBLwWNSfbrCn4/lKZkzvCmccUzhPhQZZcB6KDAg2QdbnmkbU5s0PD7K+dJb4VDAgG9AqOlPhkYibOaz5a59HCYn/K2O5nVNmCmNfrcXsUslxh12ZqYqpVcc+TxV0HJeOaEl7vnse/ImmGEC5rJR0PZdF4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=W7G37Krg; arc=none smtp.client-ip=209.85.218.69 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="W7G37Krg" Received: by mail-ej1-f69.google.com with SMTP id a640c23a62f3a-c1f3117bc6bso256339866b.0 for ; Thu, 06 Aug 2026 14:13:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1786050795; x=1786655595; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:mime-version:date:from :to:cc:subject:date:message-id:reply-to:content-type; bh=qnkVJV14Kp6C+F71DStSpJSJIVkbeyv5rgwgVjI7yaU=; b=W7G37KrgNIaX8xUmbHAOc+RtK14KY9i7WE7hjZM0CPBdmHE2TvwRPtZ0yJ73M6YGRS OPowQYg1MOiiLkuFusuCq3L3B+iIPiJ8praGiBefWCMBVHSFVIgkwxRGExjc5jWrwE+H fl/7+5bL3aAf2K7JKt0hHBBtliNg5n8ks5x+RNJHnldSDKHtPOFpaD/c/Pu3q2VqnIo5 Tv5sSwcYzF12WyppZk6kldrEJVNaXKfYfoLOdutchTmDVPs95WPWTOK+HaqB/md12RPM Ck5wMpJlUh08R9FkZ9U41VDEjvedEa9NLicALlt2BBYzDBKOEsMhOiF6WtFNn0X1ZuP1 IIsw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786050795; x=1786655595; h=content-type:cc:to:from:subject:message-id:mime-version:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=qnkVJV14Kp6C+F71DStSpJSJIVkbeyv5rgwgVjI7yaU=; b=RWVf1KQutbN0xOi0g7pkNxBciVlqMPLj3KkwWsmIQyOQGkl993iwk5lQnophkqanfa S0KgubbJ7L02l6oH0ChRG8zLMSbUmvcoliDRWDg7Tq+LIE3pyoQCm9E/k4oWoU+bV5uZ xMoD/8Rm0E8kUHxuEMD2qQI6OGR0dbHF4fF/SGnsGKTJpBlBOn5Fll+ffZMqmpEGrYPb s5Kz+CyXppALUhu0dykNUFjWMvtuImtpRlMWW0BMJuCUHIKdmP7hSi5TAwq/9WNuROHk 7QGOrAbxlFTlPXy6gb/2xiKz79+Kkyxw31lq+vFFHJ0GPr0pjvVyYR6usCRIfQgWpxxx bjhw== X-Forwarded-Encrypted: i=1; AHgh+RqxpKaGfUNC5PT1z9+7jV1I9AEXOaaEW3vM2mA/cbYKx3xrX+CV/Zp1a2K+wY6Jmv2Bmu2M7t0+EeDP+8A=@vger.kernel.org X-Gm-Message-State: AOJu0YwiSth6xlZRw5tcoMM8zkq3x+L+ObL1rlkddk7hIZE5UVrhTHjb POoDBqdIBYvjJ5EtDRTA8lHzX9p7fJX2sqaTjqavJNo4lEe+zCx7cPfySDxKwCp2aBWwLoMqrmf rAY06sqSYdB3dcE1+2VNrzg== X-Received: from ejbd8.prod.google.com ([2002:a17:906:3448:b0:c12:65e7:ce30]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:94d4:b0:c20:367b:acae with SMTP id a640c23a62f3a-c2073431341mr178529866b.32.1786050794894; Thu, 06 Aug 2026 14:13:14 -0700 (PDT) Date: Thu, 6 Aug 2026 22:13:00 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.55.0.654.g21b8a5bc05-goog Message-ID: <20260806211306.3704194-1-vdonnefort@google.com> Subject: [PATCH 0/6] ring-buffer: Fixes for subbuf resizing and persistent buffers From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, linux-trace-kernel@vger.kernel.org Cc: mathieu.desnoyers@efficios.com, kernel-team@android.com, linux-kernel@vger.kernel.org, Vincent Donnefort Content-Type: text/plain; charset="UTF-8" This series addresses multiple issues discovered with the dynamic ring buffer resizing. Changelog: v2: - Prevent resizing of the persistent ring buffer - Add missing bpage::order init - Rework subbuf_size/subbuf_order (Sashiko) - Remove ring_buffer_per_cpu::mapped - Dynamically calculate trace_buffer::max_data_size v1 (https://lore.kernel.org/all/20260805153225.2096152-1-vdonnefort@google.com/ Vincent Donnefort (6): ring-buffer: Prevent resizing of persistent ring buffer ring-buffer: Prevent subbuf order change when resizing is disabled ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer() ring-buffer: Fix subbuf resize concurrency ring-buffer: Dynamically calculate max_data_size ring-buffer: Remove ring_buffer_per_cpu::mapped kernel/trace/ring_buffer.c | 216 ++++++++++++++++++++----------------- 1 file changed, 117 insertions(+), 99 deletions(-) base-commit: 075b74841bd0065a3bda3440873c747938e69b68 -- 2.55.0.654.g21b8a5bc05-goog