2 * This file contains several functions and variables used for system
5 * Statistical Profiling:
6 * The interrupt handler for profiling clock.
9 * The table used for profiling data and a function to get its size.
11 * The function used by kernelspace processes to register the locations
12 * of their control struct and profiling table.
15 * 14 Aug, 2006 Created, (Rogier Meurs)
18 #include <minix/config.h>
20 #include <minix/profile.h>
21 #include <minix/portio.h>
30 /* Function prototype for the profiling clock handler. */
31 FORWARD
_PROTOTYPE( int profile_clock_handler
, (irq_hook_t
*hook
) );
33 /* A hook for the profiling clock interrupt handler. */
34 PRIVATE irq_hook_t profile_clock_hook
;
36 /*===========================================================================*
37 * init_profile_clock *
38 *===========================================================================*/
39 PUBLIC
void init_profile_clock(u32_t freq
)
43 if((irq
= arch_init_profile_clock(freq
)) >= 0) {
44 /* Register interrupt handler for statistical system profiling. */
45 profile_clock_hook
.proc_nr_e
= CLOCK
;
46 put_irq_handler(&profile_clock_hook
, irq
, profile_clock_handler
);
47 enable_irq(&profile_clock_hook
);
51 /*===========================================================================*
52 * profile_clock_stop *
53 *===========================================================================*/
54 PUBLIC
void stop_profile_clock()
56 arch_stop_profile_clock();
58 /* Unregister interrupt handler. */
59 disable_irq(&profile_clock_hook
);
60 rm_irq_handler(&profile_clock_hook
);
63 /*===========================================================================*
64 * profile_clock_handler *
65 *===========================================================================*/
66 PRIVATE
int profile_clock_handler(irq_hook_t
*hook
)
68 /* This executes on every tick of the CMOS timer. */
70 /* Are we profiling, and profiling memory not full? */
71 if (!sprofiling
|| sprof_info
.mem_used
== -1) return (1);
73 /* Check if enough memory available before writing sample. */
74 if (sprof_info
.mem_used
+ sizeof(sprof_info
) > sprof_mem_size
) {
75 sprof_info
.mem_used
= -1;
82 if (priv(proc_ptr
)->s_proc_nr
== IDLE
) {
83 sprof_info
.idle_samples
++;
85 /* Runnable system process? */
86 if (priv(proc_ptr
)->s_flags
& SYS_PROC
&& proc_is_runnable(proc_ptr
)) {
87 /* Note: k_reenter is always 0 here. */
89 /* Store sample (process name and program counter). */
90 data_copy(KERNEL
, (vir_bytes
) proc_ptr
->p_name
,
91 sprof_ep
, sprof_data_addr_vir
+ sprof_info
.mem_used
,
92 strlen(proc_ptr
->p_name
));
94 data_copy(KERNEL
, (vir_bytes
) &proc_ptr
->p_reg
.pc
, sprof_ep
,
95 (vir_bytes
) (sprof_data_addr_vir
+ sprof_info
.mem_used
+
96 sizeof(proc_ptr
->p_name
)),
97 (vir_bytes
) sizeof(proc_ptr
->p_reg
.pc
));
99 sprof_info
.mem_used
+= sizeof(sprof_sample
);
101 sprof_info
.system_samples
++;
104 sprof_info
.user_samples
++;
107 sprof_info
.total_samples
++;
109 /* Acknowledge interrupt if necessary. */
110 arch_ack_profile_clock();
112 return(1); /* reenable interrupts */
115 #endif /* SPROFILE */
119 * The following variables and functions are used by the procentry/
120 * procentry syslib functions when linked with kernelspace processes.
121 * For userspace processes, the same variables and function are defined
122 * elsewhere. This enables different functionality and variable sizes,
123 * which is needed is a few cases.
126 /* A small table is declared for the kernelspace processes. */
127 struct cprof_tbl_s cprof_tbl
[CPROF_TABLE_SIZE_KERNEL
];
129 /* Function that returns table size. */
130 PUBLIC
int profile_get_tbl_size(void)
132 return CPROF_TABLE_SIZE_KERNEL
;
135 /* Function that returns on which execution of procentry to announce. */
136 PUBLIC
int profile_get_announce(void)
138 return CPROF_ACCOUNCE_KERNEL
;
142 * The kernel "announces" its control struct and table locations
143 * to itself through this function.
145 PUBLIC
void profile_register(ctl_ptr
, tbl_ptr
)
153 if(cprof_procs_no
>= NR_SYS_PROCS
)
156 /* Store process name, control struct, table locations. */
157 rp
= proc_addr(SYSTEM
);
159 cprof_proc_info
[cprof_procs_no
].endpt
= rp
->p_endpoint
;
160 cprof_proc_info
[cprof_procs_no
].name
= rp
->p_name
;
161 cprof_proc_info
[cprof_procs_no
].ctl_v
= (vir_bytes
) ctl_ptr
;
162 cprof_proc_info
[cprof_procs_no
].buf_v
= (vir_bytes
) tbl_ptr
;