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Vincent Donnefort
7d776a3627
Add two fields pages_touched and pages_lost to the ring-buffer meta-page. Those fields are useful to get the number of used pages in the ring-buffer. Link: https://patch.msgid.link/20260309162516.2623589-2-vdonnefort@google.com Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Vincent Donnefort <vdonnefort@google.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _TRACE_MMAP_H_
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#define _TRACE_MMAP_H_
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#include <linux/types.h>
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/**
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* struct trace_buffer_meta - Ring-buffer Meta-page description
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* @meta_page_size: Size of this meta-page.
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* @meta_struct_len: Size of this structure.
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* @subbuf_size: Size of each sub-buffer.
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* @nr_subbufs: Number of subbfs in the ring-buffer, including the reader.
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* @reader.lost_events: Number of events lost at the time of the reader swap.
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* @reader.id: subbuf ID of the current reader. ID range [0 : @nr_subbufs - 1]
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* @reader.read: Number of bytes read on the reader subbuf.
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* @flags: Placeholder for now, 0 until new features are supported.
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* @entries: Number of entries in the ring-buffer.
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* @overrun: Number of entries lost in the ring-buffer.
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* @read: Number of entries that have been read.
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* @pages_lost: Number of pages overwritten by the writer.
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* @pages_touched: Number of pages written by the writer.
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*/
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struct trace_buffer_meta {
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__u32 meta_page_size;
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__u32 meta_struct_len;
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__u32 subbuf_size;
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__u32 nr_subbufs;
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struct {
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__u64 lost_events;
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__u32 id;
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__u32 read;
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} reader;
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__u64 flags;
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__u64 entries;
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__u64 overrun;
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__u64 read;
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__u64 pages_lost;
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__u64 pages_touched;
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};
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#define TRACE_MMAP_IOCTL_GET_READER _IO('R', 0x20)
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#endif /* _TRACE_MMAP_H_ */
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