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>
26 #include <ust/kcompat/kcompat.h>
30 #include <urcu/list.h>
31 #include <urcu/urcu_ref.h>
33 #define EVENTS_PER_CHANNEL 65536
41 /* First 32 bytes cache-hot cacheline */
42 struct ust_trace
*trace
;
43 int *buf_struct_shmids
;
44 struct ust_buffer
**buf
;
46 /* whether collection is requested upon trace start */
47 int request_collection
:1;
49 unsigned int n_subbufs_order
;
50 unsigned long commit_count_mask
; /*
51 * Commit count mask, removing
52 * the MSBs corresponding to
53 * bits used to represent the
56 /* End of first 32 bytes cacheline */
58 struct urcu_ref urcu_ref
; /* Channel transport reference count */
60 int subbuf_size_order
;
61 unsigned int subbuf_cnt
;
62 const char *channel_name
;
67 struct cds_list_head list
;
68 } ____cacheline_aligned
;
70 struct ltt_channel_setting
{
71 unsigned int subbuf_size
;
72 unsigned int subbuf_cnt
;
73 struct urcu_ref urcu_ref
; /* Number of references to structure content */
74 struct cds_list_head list
;
75 unsigned int index
; /* index of channel in trace channel array */
76 u16 free_event_id
; /* Next event ID to allocate */
80 extern int ltt_channels_register(const char *name
);
81 extern int ltt_channels_unregister(const char *name
);
82 extern int ltt_channels_set_default(const char *name
,
83 unsigned int subbuf_size
,
84 unsigned int subbuf_cnt
);
85 extern const char *ltt_channels_get_name_from_index(unsigned int index
);
86 extern int ltt_channels_get_index_from_name(const char *name
);
87 extern struct ust_channel
*ltt_channels_trace_alloc(unsigned int *nr_channels
,
89 int request_collection
,
91 extern void ltt_channels_trace_free(struct ust_channel
*channels
);
92 extern int _ltt_channels_get_event_id(const char *channel
, const char *name
);
93 extern int ltt_channels_get_event_id(const char *channel
, const char *name
);
95 extern int ust_channels_overwrite_by_default
;
96 extern int ust_channels_request_collection_by_default
;
98 #endif /* UST_CHANNELS_H */