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From: Vincent Donnefort <vdonnefort@google.com>
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 <vdonnefort@google.com>
Subject: [PATCH v15 1/6] ring-buffer: Zero ring-buffer sub-buffers
Date: Fri,  9 Feb 2024 10:21:57 +0000	[thread overview]
Message-ID: <20240209102202.649049-2-vdonnefort@google.com> (raw)
In-Reply-To: <20240209102202.649049-1-vdonnefort@google.com>

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 <vdonnefort@google.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

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,
 
 		list_add(&bpage->list, pages);
 
-		page = alloc_pages_node(cpu_to_node(cpu_buffer->cpu), mflags,
+		page = 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, long nr_pages, int cpu)
 
 	cpu_buffer->reader_page = bpage;
 
-	page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL, cpu_buffer->buffer->subbuf_order);
+	page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_ZERO,
+				cpu_buffer->buffer->subbuf_order);
 	if (!page)
 		goto fail_free_reader;
 	bpage->page = page_address(page);
@@ -5525,7 +5527,8 @@ ring_buffer_alloc_read_page(struct trace_buffer *buffer, int cpu)
 	if (bpage->data)
 		goto out;
 
-	page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_NORETRY,
+	page = alloc_pages_node(cpu_to_node(cpu),
+				GFP_KERNEL | __GFP_NORETRY | __GFP_ZERO,
 				cpu_buffer->buffer->subbuf_order);
 	if (!page) {
 		kfree(bpage);
-- 
2.43.0.687.g38aa6559b0-goog


  reply	other threads:[~2024-02-09 10:22 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-09 10:21 [PATCH v15 0/6] Introducing trace buffer mapping by user-space Vincent Donnefort
2024-02-09 10:21 ` Vincent Donnefort [this message]
2024-02-09 10:21 ` [PATCH v15 2/6] ring-buffer: Introducing ring-buffer mapping functions Vincent Donnefort
2024-02-09 13:25   ` Steven Rostedt
2024-02-09 10:21 ` [PATCH v15 3/6] tracing: Add snapshot refcount Vincent Donnefort
2024-02-09 10:22 ` [PATCH v15 4/6] tracing: Allow user-space mapping of the ring-buffer Vincent Donnefort
2024-02-09 10:22 ` [PATCH v15 5/6] Documentation: tracing: Add ring-buffer mapping Vincent Donnefort
2024-02-09 10:22 ` [PATCH v15 6/6] ring-buffer/selftest: Add ring-buffer mapping test Vincent Donnefort

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