From nobody Mon Feb 9 16:51:55 2026 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (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 404F279DB1 for ; Fri, 9 Feb 2024 16:34:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707496500; cv=none; b=VSah0SCgRtWOeTcctDAHCsvWKQaYlI2t77P6JAVmbQazMtpFZLrq8VcszPhs0hBs4MML+ztX/KI1jFHjg1BB8XRmsYKpu42TJs2DXeMsLpqi9+Xkkb4p9ePyVE6zdwMIMODZKX9ABU3cJIhg9wSJQ7Gdh+RU1mhrrOtJ+jTYNTc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707496500; c=relaxed/simple; bh=tpt51FeO44HeEXQqmygp1fYLZoXSRZvsHL381MrJybw=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=DniC/RN8lo3GNVdrxEMVMQpO6zO5hzq89hdLOSffLYeR9WJrCy3ifDjhZBcWBLFxRVZJEXH8nGzun/akGZNJnRQvou5hL1YNkRh4s3WXRFmRX53ElGXDjxQ/bL2oYos5ovLJYAlJqllNc7GBu1sqQbkmznIud+gRTVSJpz8aM7I= 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=phyjwkxs; arc=none smtp.client-ip=209.85.128.201 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="phyjwkxs" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-604a4923adaso21423927b3.0 for ; Fri, 09 Feb 2024 08:34:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1707496498; x=1708101298; 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=SqiLbHub5ruL/UvpG5IMav/eAn4s+2aSSt9gMa9+oOE=; b=phyjwkxs2hfxij1srxXmONjYuSe3PReyQ9CMi2LTWTwvM6LOwGS8xkhOVjrzRwlOLj 8KtLdsEZziMaYLZLJOnskI2WZfRc8Ykh86PieGQBCGFnwDRMlH96lvbroXdwaC/s/cvZ sgN5bUfR0fo+Fb9JEynvKkdBCzwgeCVO/l5Z5tSZImqdaAIcGeOMdUDVFcL4KET75M7f 2Hn/qrsiDNEBZm69o9wQXRjamdGJCvihcMoNvext8Q+PFFfLrNNh4MkVtHhYmeiH5khN pQqBHWoGSrrm1JZw3I+AG2vxNnMYgx1TMVIm2zGPFHhPf4EwQXCUqkzb52BkA6s8DEi+ DncA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707496498; x=1708101298; 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=SqiLbHub5ruL/UvpG5IMav/eAn4s+2aSSt9gMa9+oOE=; b=AYRT/+g2H7xDap/2HzmiIYMTFdn4ATbDYrToo/jdRpbf7IXU4VDaz0ScYFYGmOCM7o BYEHXrqIQj8kqi2nNPqEd7PkUloiUdwZDcYRjMWRXd9iicYHGeQlqBmzYyY66CGfxCDu MrSEfSIVZifNWuFO0+o7l35D7Yrc/n8ARFE5JxZI8suQXJOpEzotsQIEIuy3Z8bBQDhp b4mKgP+EMo/rum9ChtJYVnZQEFx9SRDH6BL+MCK7eLBq23Cut+FxGWQ2ediZyWoqSZAX WwATFsVTzy6a7cKhTZSj7AkqzbpFqCob26T54SAVPexpkFFbcd4eESvopFyCXVR1OnXD fO0g== X-Forwarded-Encrypted: i=1; AJvYcCXQlkW88MYy2LUJlIYaxcW7rNsuNdqxNLexOi8wLVeyJBvYucSeq1FTixYKqlLfFc4HyP1bHSkFNUmaKjE+fHH+GPNxEXfORr6Pvlwf X-Gm-Message-State: AOJu0Yy6fasTohLUhCTJN2x9jDDB3sUjqK3V8f0b48C7IzQx9qy6BgD1 hGD3PTymOs/x7wNwpz3ieqgUbcwozkbg0KamuvcNlN2tBzvRbWPgg+g9yzTsybrcvRd7Szm6dx4 7MX4XLZAX664scQt7vQ== X-Google-Smtp-Source: AGHT+IHsUr4KLeBPkUZktC5moT97bX5Rxc0DBZEC540ur7j/KZeKn8oGEo5KdM8bxIEdnlwUn8otuef9jKTuaqz9 X-Received: from vdonnefort.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:2eea]) (user=vdonnefort job=sendgmr) by 2002:a81:8491:0:b0:604:9b73:ee86 with SMTP id u139-20020a818491000000b006049b73ee86mr275232ywf.4.1707496498236; Fri, 09 Feb 2024 08:34:58 -0800 (PST) Date: Fri, 9 Feb 2024 16:34:43 +0000 In-Reply-To: <20240209163448.944970-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240209163448.944970-1-vdonnefort@google.com> X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog Message-ID: <20240209163448.944970-2-vdonnefort@google.com> Subject: [PATCH v16 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 fd4bfe3ecf01..ca796675c0a1 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1472,7 +1472,8 @@ 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; @@ -1557,7 +1558,8 @@ 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 2.43.0.687.g38aa6559b0-goog