From: Vincent Donnefort <vdonnefort@google.com>
To: linux-trace-devel@vger.kernel.org, rostedt@goodmis.org
Cc: Vincent Donnefort <vdonnefort@google.com>
Subject: [PATCH v3] libtracefs: Update trace_buffer_meta
Date: Fri, 23 Feb 2024 22:47:23 +0000 [thread overview]
Message-ID: <20240223224723.132673-1-vdonnefort@google.com> (raw)
The current version for struct trace_buffer_meta is taken from a work in
progress Linux patch series. Update it.
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
diff --git a/src/tracefs-mmap.c b/src/tracefs-mmap.c
index fac13df..a0130bb 100644
--- a/src/tracefs-mmap.c
+++ b/src/tracefs-mmap.c
@@ -9,26 +9,43 @@
#include <asm/types.h>
#include "tracefs-local.h"
+/**
+ * struct trace_buffer_meta - Ring-buffer Meta-page description
+ * @meta_page_size: Size of this meta-page.
+ * @meta_struct_len: Size of this structure.
+ * @subbuf_size: Size of each sub-buffer.
+ * @nr_subbufs: Number of subbfs in the ring-buffer, including the reader.
+ * @reader.lost_events: Number of events lost at the time of the reader swap.
+ * @reader.id: subbuf ID of the current reader. ID range [0 : @nr_subbufs - 1]
+ * @reader.read: Number of bytes read on the reader subbuf.
+ * @flags: Placeholder for now, 0 until new features are supported.
+ * @entries: Number of entries in the ring-buffer.
+ * @overrun: Number of entries lost in the ring-buffer.
+ * @read: Number of entries that have been read.
+ * @Reserved1: Reserved for future use.
+ * @Reserved2: Reserved for future use.
+ */
struct trace_buffer_meta {
- unsigned long entries;
- unsigned long overrun;
- unsigned long read;
+ __u32 meta_page_size;
+ __u32 meta_struct_len;
- unsigned long subbufs_touched;
- unsigned long subbufs_lost;
- unsigned long subbufs_read;
+ __u32 subbuf_size;
+ __u32 nr_subbufs;
struct {
- unsigned long lost_events; /* Events lost at the time of the reader swap */
- __u32 id; /* Reader subbuf ID from 0 to nr_subbufs - 1 */
- __u32 read; /* Number of bytes read on the reader subbuf */
+ __u64 lost_events;
+ __u32 id;
+ __u32 read;
} reader;
- __u32 subbuf_size; /* Size of each subbuf including the header */
- __u32 nr_subbufs; /* Number of subbufs in the ring-buffer */
+ __u64 flags;
+
+ __u64 entries;
+ __u64 overrun;
+ __u64 read;
- __u32 meta_page_size; /* Size of the meta-page */
- __u32 meta_struct_len; /* Len of this struct */
+ __u64 Reserved1;
+ __u64 Reserved2;
};
#define TRACE_MMAP_IOCTL_GET_READER _IO('T', 0x1)
base-commit: 04505a07824592f039eac66fe565994635eb5d5d
--
2.44.0.rc0.258.g7320e95886-goog
reply other threads:[~2024-02-23 22:47 UTC|newest]
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