source: trunk/kernel/syscalls/sys_trace.c

Last change on this file was 670, checked in by alain, 18 months ago

1) Introduce up to 4 command lines arguments in the KSH "load" command.
These arguments are transfered to the user process through the
argc/argv mechanism, using the user space "args" vseg.

2) Introduce the named and anonymous "pipes", for inter-process communication
through the pipe() and mkfifo() syscalls.

3) Introduce the "chat" application to validate the two above mechanisms.

4) Improve printk() and assert() fonctions in printk.c.

File size: 3.1 KB
Line 
1/*
2 * sys_trace.c - activate / desactivate the context switches trace for a given core
3 *
4 * Author    Alain Greiner (c) (2016,2017,2018,2019)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <hal_kernel_types.h>
25#include <hal_special.h>
26#include <printk.h>
27#include <thread.h>
28#include <errno.h>
29#include <shared_syscalls.h>
30#include <syscalls.h>
31
32///////////////////////////////
33int sys_trace( bool_t   active,
34               cxy_t    cxy,
35               lid_t    lid )
36{
37    uint32_t    ncores;
38
39    thread_t  * this    = CURRENT_THREAD;
40
41#if DEBUG_SYS_TRACE || DEBUG_SYSCALLS_ERROR || CONFIG_INSTRUMENTATION_SYSCALLS
42process_t * process  = this->process;
43uint64_t    tm_start = hal_get_cycles();
44#endif
45
46#if DEBUG_SYS_TRACE
47if( DEBUG_SYS_TRACE < tm_start )
48printk("\n[%s] thread[%x,%x] enters / cycle = %d\n",
49__FUNCTION__, this->process->pid, this->trdid, (uint32_t)tm_start );
50#endif
51
52    // check cluster identifier
53    if( cluster_is_active( cxy ) == false )
54    {
55
56#if DEBUG_SYSCALLS_ERROR
57if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start )
58printk("\n[ERROR] in %s : thread[%x,%x] / illegal cxy argument %x\n",
59__FUNCTION__ , this->trdid , process->pid , cxy );
60#endif
61        this->errno = EINVAL;
62        return -1;
63    }
64
65    // check core local index
66    ncores = hal_remote_l32( XPTR( cxy , &LOCAL_CLUSTER->cores_nr ) );
67    if( lid >= ncores )
68    {
69
70#if DEBUG_SYSCALLS_ERROR
71if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start )
72printk("\n[ERROR] in %s : thread[%x,%x] / illegal lid argument %x\n",
73__FUNCTION__ , this->trdid , process->pid , lid );
74#endif
75        this->errno = EINVAL;
76        return -1;
77    }
78
79    // get local pointer on target core
80    core_t * core = &LOCAL_CLUSTER->core_tbl[lid];
81
82    // get extended pointer on target scheduler trace field
83    xptr_t trace_xp = XPTR( cxy , &core->scheduler.trace );
84
85    if ( active ) hal_remote_s32( trace_xp , 1 );
86    else          hal_remote_s32( trace_xp , 0 );
87   
88    hal_fence();
89
90#if (DEBUG_SYS_TRACE || CONFIG_INSTRUMENTATION_SYSCALLS)
91uint64_t     tm_end = hal_get_cycles();
92#endif
93
94#if DEBUG_SYS_TRACE
95if( DEBUG_SYS_TRACE < tm_end )
96printk("\n[%s] thread[%x,%x] exit / cycle %d\n",
97__FUNCTION__, this->process->pid, this->trdid, (uint32_t)tm_end );
98#endif
99
100#if CONFIG_INSTRUMENTATION_SYSCALLS
101hal_atomic_add( &syscalls_cumul_cost[SYS_TRACE] , tm_end - tm_start );
102hal_atomic_add( &syscalls_occurences[SYS_TRACE] , 1 );
103#endif
104
105    return 0;
106
107}  // end sys_trace()
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