5 * Copyright (C) 2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
7 * Dynamic tracer channel allocation.
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include <linux/limits.h>
27 #include <ust/kernelcompat.h>
29 #define EVENTS_PER_CHANNEL 65536
37 /* First 32 bytes cache-hot cacheline */
38 struct ust_trace
*trace
;
39 int *buf_struct_shmids
;
40 struct ust_buffer
**buf
;
43 unsigned int n_subbufs_order
;
44 unsigned long commit_count_mask
; /*
45 * Commit count mask, removing
46 * the MSBs corresponding to
47 * bits used to represent the
50 /* End of first 32 bytes cacheline */
52 struct kref kref
; /* Channel transport reference count */
54 int subbuf_size_order
;
55 unsigned int subbuf_cnt
;
56 const char *channel_name
;
61 struct list_head list
;
62 } ____cacheline_aligned
;
64 struct ltt_channel_setting
{
65 unsigned int subbuf_size
;
66 unsigned int subbuf_cnt
;
67 struct kref kref
; /* Number of references to structure content */
68 struct list_head list
;
69 unsigned int index
; /* index of channel in trace channel array */
70 u16 free_event_id
; /* Next event ID to allocate */
74 extern int ltt_channels_register(const char *name
);
75 extern int ltt_channels_unregister(const char *name
);
76 extern int ltt_channels_set_default(const char *name
,
77 unsigned int subbuf_size
,
78 unsigned int subbuf_cnt
);
79 extern const char *ltt_channels_get_name_from_index(unsigned int index
);
80 extern int ltt_channels_get_index_from_name(const char *name
);
81 extern struct ust_channel
*ltt_channels_trace_alloc(unsigned int *nr_channels
,
84 extern void ltt_channels_trace_free(struct ust_channel
*channels
);
85 extern int _ltt_channels_get_event_id(const char *channel
, const char *name
);
86 extern int ltt_channels_get_event_id(const char *channel
, const char *name
);
88 #endif /* UST_CHANNELS_H */
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