1 /* Copyright (C) 2021 Free Software Foundation, Inc.
2 Contributed by Oracle.
3
4 This file is part of GNU Binutils.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "config.h"
22 #include <time.h>
23 #include <unistd.h>
24 #include <string.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <sys/resource.h>
28
29 #include "gp-defs.h"
30 #include "gp-time.h"
31
32 /* =============================================================== */
33 /*
34 * Below this are the get_clock_rate() and get_ncpus() for all architectures
35 */
36
37 static int clock_rate = 0;
38 static int ncpus = 0;
39 static char msgbuf[1024];
40
41 int
get_clock_rate(void)42 get_clock_rate (void)
43 {
44 /* Linux version -- read /proc/cpuinfo
45 * Note the parsing is different on intel-Linux and sparc-Linux
46 */
47 FILE *fp = fopen ("/proc/cpuinfo", "r");
48 if (fp != NULL)
49 {
50
51 char temp[1024];
52 while (fgets (temp, sizeof (temp), fp) != NULL)
53 {
54 #if ARCH(SPARC)
55 /* cpu count for SPARC linux -- read from /proc/cpuinfo */
56 if (strncmp (temp, "ncpus active", 12) == 0)
57 {
58 char *val = strchr (temp, ':');
59 ncpus = val ? atol (val + 1) : 0;
60 }
61 #endif /* ARCH(SPARC) */
62
63 if (clock_rate == 0)
64 {
65 /* pick the first line that gives a CPU clock rate */
66 #if ARCH(SPARC)
67 long long clk;
68 if (strncmp (temp, "Cpu0ClkTck", 10) == 0)
69 {
70 char *val = strchr (temp, ':');
71 clk = val ? strtoll (val + 1, NULL, 16) : 0;
72 clock_rate = (int) (clk / 1000000);
73 }
74 #else
75 if (strncmp (temp, "cpu MHz", 7) == 0)
76 {
77 char *val = strchr (temp, ':');
78 clock_rate = val ? atoi (val + 1) : 0;
79 }
80 #endif /* ARCH() */
81 }
82
83 /* did we get a clock rate? */
84 if (clock_rate != 0)
85 {
86 #if ARCH(SPARC)
87 /* since we got a cpu count, we can break from the look */
88 break;
89 #endif /* ARCH(SPARC) */
90 }
91 #if ARCH(Intel)
92 /* On intel-Linux, count cpus based on "cpu MHz" lines */
93 if (strncmp (temp, "cpu MHz", 7) == 0)
94 ncpus++;
95 #endif /* ARCH(Intel) */
96 }
97 fclose (fp);
98 }
99
100 if (clock_rate != 0)
101 sprintf (msgbuf,
102 "Clock rate = %d MHz (from reading /proc/cpuinfo) %d CPUs\n",
103 clock_rate, ncpus);
104
105 /* did we get a clock rate? */
106 if (clock_rate == 0)
107 {
108 clock_rate = 1000;
109 sprintf (msgbuf, "Clock rate = %d MHz (set by default) %d CPUs\n",
110 clock_rate, ncpus);
111 }
112 return clock_rate;
113 }
114
115 int
get_ncpus(void)116 get_ncpus (void)
117 {
118 if (clock_rate == 0)
119 get_clock_rate ();
120 return ncpus;
121 }
122
123 /* gethrvtime -- generic solution, getting user time from
124 * clock_gettime(CLOCK_THREAD_CPUTIME_ID,..), and reformatting.
125 * need -lrt to compile.*/
126 hrtime_t
gethrvtime()127 gethrvtime ()
128 {
129 struct timespec tp;
130 hrtime_t rc = 0;
131 int r = clock_gettime (CLOCK_THREAD_CPUTIME_ID, &tp);
132 if (r == 0)
133 rc = ((hrtime_t) tp.tv_sec) * 1000000000 + (hrtime_t) tp.tv_nsec;
134 return rc;
135 }
136
137 /*
138 * CLOCK_MONOTONIC
139 * Clock that cannot be set and represents monotonic time since some
140 * unspecified starting point.
141 */
142 hrtime_t
gethrtime(void)143 gethrtime (void)
144 {
145 struct timespec tp;
146 hrtime_t rc = 0;
147
148 /*
149 * For er_kernel on Linux, we want to match how DTrace gets its timestamps.
150 * This is CLOCK_MONOTONIC_RAW. It might be changing to CLOCK_MONOTONIC.
151 * For now, we change to "RAW" and can change back if DTrace changes.
152 *
153 * The two can be different. Check the clock_gettime() man page.
154 * CLOCK_MONOTONIC_RAW is Linux-specific and introduced in 2.6.28.
155 * It is impervious to NTP or adjtime adjustments.
156 *
157 * We must match the timer used in perfan/libcollector/src/gethrtime.c.
158 *
159 * There is no issue on Solaris, where gethrtime() is provided by the kernel
160 * and used by DTrace.
161 */
162 #ifdef CLOCK_MONOTONIC_RAW
163 int r = clock_gettime (CLOCK_MONOTONIC_RAW, &tp);
164 #else
165 int r = clock_gettime (CLOCK_MONOTONIC, &tp);
166 #endif
167 if (r == 0)
168 rc = ((hrtime_t) tp.tv_sec) * 1000000000 + (hrtime_t) tp.tv_nsec;
169 return rc;
170 }
171