Fix: split UST per UID/PID default values
[lttng-tools.git] / src / common / defaults.c
1 /*
2 * Copyright (C) 2012 - Simon Marchi <simon.marchi@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #include <stddef.h>
19 #include <unistd.h>
20
21 #include "defaults.h"
22 #include "macros.h"
23
24 size_t default_channel_subbuf_size;
25 size_t default_metadata_subbuf_size;
26 size_t default_kernel_channel_subbuf_size;
27 size_t default_ust_pid_channel_subbuf_size;
28 size_t default_ust_uid_channel_subbuf_size;
29
30 static void __attribute__((constructor)) init_defaults(void)
31 {
32 /*
33 * The libringbuffer won't accept subbuf sizes smaller than the page size.
34 * If the default subbuf size is smaller, replace it by the page size.
35 */
36 long page_size = sysconf(_SC_PAGESIZE);
37
38 if (page_size < 0) {
39 page_size = 0;
40 }
41
42 default_channel_subbuf_size =
43 max(_DEFAULT_CHANNEL_SUBBUF_SIZE, page_size);
44 default_metadata_subbuf_size =
45 max(DEFAULT_METADATA_SUBBUF_SIZE, page_size);
46 default_kernel_channel_subbuf_size =
47 max(DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE, page_size);
48 default_ust_pid_channel_subbuf_size =
49 max(DEFAULT_UST_PID_CHANNEL_SUBBUF_SIZE, page_size);
50 default_ust_uid_channel_subbuf_size =
51 max(DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE, page_size);
52 }
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