[PATCH v15 1/6] ring-buffer: Zero ring-buffer sub-buffers
flat view
STALE972d
REVIEWED: 9 (9M)
From: Vincent Donnefort <hidden>
Date: 2024-02-09 10:22:15
Also in:
lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Revision v15 of 25 in this series; 1 review trailer (1 from subsystem maintainers).
Revisions (25)
- rfc [diff vs current]
- v1 [diff vs current]
- v2 [diff vs current]
- v3 [diff vs current]
- v4 [diff vs current]
- v5 [diff vs current]
- v6 [diff vs current]
- v7 [diff vs current]
- v8 [diff vs current]
- v9 [diff vs current]
- v10 [diff vs current]
- v11 [diff vs current]
- v12 [diff vs current]
- v13 [diff vs current]
- v14 [diff vs current]
- v15 current
- v16 [diff vs current]
- v17 [diff vs current]
- v18 [diff vs current]
- v19 [diff vs current]
- v19 [diff vs current]
- v20 [diff vs current]
- v21 [diff vs current]
- v22 [diff vs current]
- v23 [diff vs current]
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 <redacted> 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