From nobody Wed Dec 24 23:36:17 2025 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (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 629AC5C915 for ; Tue, 23 Jan 2024 11:08:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706008087; cv=none; b=Iw0CmjtR2h4vWS+ZuEzlb/ZJ/U93zAywWQySLFfJJyA6VJ603AE1AeKzHT+4mcuWw/14VJxXG6OOG+IH1NtPQZdcX4NsFBKgupSrjoo+6zqlQM4lQK9IoetHy8lLLXJuvGt+HKw6JVBowbruSbCpkFfyfvfEk+byMO7Bd7rYB84= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706008087; c=relaxed/simple; bh=OvEEBWdcH3OKo6KDL1Af3FAQxWgGr/9147Iu28ODlPQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=pGXnB29zL9fw/OljuUgXZlBB898u3nQGPQG4NMwWpHO0QCYV+GKfKM5MD8cq/hFsbsZTNPZRb16+/gz39zw94m65mQLY4s+lYETPJJYpJpYheE82TJPMSX0lbyST911s/CqwxjNtKOs2YtrHEowWbkk6AI7b9yn1f2mKVcpcdJg= 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=LlxyUMXp; arc=none smtp.client-ip=209.85.128.202 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="LlxyUMXp" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-5e6f42b1482so63537467b3.3 for ; Tue, 23 Jan 2024 03:08:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1706008083; x=1706612883; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=GTPmymlTxKhC1ZOw6521BjIEJCf876w90abWnygi6LA=; b=LlxyUMXpJBV3weDVRUHO7AXYO5YGYFA3Cw7Y2otFwa11ZNhurhFUq/RToCG050OWi5 8Bku70Yy4k9DXTh5i3GIszH8PZaJgQm0teIVTVNu+CB6Jikyhq+ZfM1APqn0xT999UH+ W8UW1CPIsZ+8yic7UvgQPDAJjXMFMsY1wA/wXcOT9E9xmyQGfDfCwyEXh++hT7Ucbiwk PiIertEywXOLd4cAFWA3bRhk+iWw99m+HM9JTydC838o88fRcSD+qv4P57T2mna1Dq2Y QhLguAydIYRmo/MhR+blY0mClbHHozAK22yOk6Dy+Ru3iCiE3akb5Kz6I1pMiT8Ffp6a l5LQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706008083; x=1706612883; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=GTPmymlTxKhC1ZOw6521BjIEJCf876w90abWnygi6LA=; b=aswA6HhfCwdaio4npTYMAsfhQHhDIxlUwQlAZfTZxEiIWT+PdblKQSAmHZiBgwilfy mlxbA1xahsbFP5TKVWR/Zmz4hNOPwKm0pumPohcYNabJtP5KIq71n/cSRwn4oQtOhyiM 0vEYbELtuh45UwYP4JrBjnABilp1+pDzxF1cYg0N96/aDe1ogJbFNEZiAXialMhjP4b7 3LrMoWf60H7DGD9liMBg5RMUcP8qSwCzpczvWe2LOUrq4Rj9b/qvz9a+pwd+8HU4ScVI JGChTSVCHgAYyBnFvYiCTIY6Uf0Mw1JV46BRzYaMFBkvSJbuc8h+lzGDKY/wlBp7veEj mClg== X-Gm-Message-State: AOJu0YyfCqf267/JBQt1o3avmMFQW/GXnjCqOqukKiYwvgBZsBPpgCIZ n9sufO9h1rxR/iBhNDo7l6gkrooL/dy4kI0gXFpJ1hnKP5QZHsbaSdN2+k2DcRK00a0Cbk21Jl+ u5zatEwl75WxIwx7c2Q== X-Google-Smtp-Source: AGHT+IFntKP4XZZ43QuR+umsJroitll4qvgERUZmB0oEZ8AsB1XTKr3l5rGp56Z7TXjvTNRwaYCbKG38H3a/DY06 X-Received: from vdonnefort.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:2eea]) (user=vdonnefort job=sendgmr) by 2002:a05:690c:24d:b0:5ff:b6cc:10e with SMTP id ba13-20020a05690c024d00b005ffb6cc010emr1505537ywb.10.1706008083460; Tue, 23 Jan 2024 03:08:03 -0800 (PST) Date: Tue, 23 Jan 2024 11:07:52 +0000 In-Reply-To: <20240123110757.3657908-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240123110757.3657908-1-vdonnefort@google.com> X-Mailer: git-send-email 2.43.0.429.g432eaa2c6b-goog Message-ID: <20240123110757.3657908-2-vdonnefort@google.com> Subject: [PATCH v12 1/6] ring-buffer: Zero ring-buffer sub-buffers From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: mathieu.desnoyers@efficios.com, kernel-team@android.com, Vincent Donnefort Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In preparation for the ring-buffer memory mapping where each subbuf will be accessible to user-space, zero all the page allocations. Signed-off-by: Vincent Donnefort Reviewed-by: Masami Hiramatsu (Google) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 173d2595ce2d..db73e326fa04 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1466,7 +1466,8 @@ static int __rb_allocate_pages(struct ring_buffer_per= _cpu *cpu_buffer, =20 list_add(&bpage->list, pages); =20 - page =3D alloc_pages_node(cpu_to_node(cpu_buffer->cpu), mflags, + page =3D alloc_pages_node(cpu_to_node(cpu_buffer->cpu), + mflags | __GFP_ZERO, cpu_buffer->buffer->subbuf_order); if (!page) goto free_pages; @@ -1551,7 +1552,8 @@ rb_allocate_cpu_buffer(struct trace_buffer *buffer, l= ong nr_pages, int cpu) =20 cpu_buffer->reader_page =3D bpage; =20 - page =3D alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL, cpu_buffer->buffe= r->subbuf_order); + page =3D alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_ZERO, + cpu_buffer->buffer->subbuf_order); if (!page) goto fail_free_reader; bpage->page =3D page_address(page); @@ -5525,7 +5527,8 @@ ring_buffer_alloc_read_page(struct trace_buffer *buff= er, int cpu) if (bpage->data) goto out; =20 - page =3D alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_NORETRY, + page =3D alloc_pages_node(cpu_to_node(cpu), + GFP_KERNEL | __GFP_NORETRY | __GFP_ZERO, cpu_buffer->buffer->subbuf_order); if (!page) { kfree(bpage); --=20 2.43.0.429.g432eaa2c6b-goog