87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
#ifndef DEBUG_H
|
|
#define DEBUG_H
|
|
|
|
/* This header file defines all debugging constants and macros, and declares
|
|
* some variables. Certain debugging features redefine standard constants
|
|
* and macros. Therefore, this header file should be included after the
|
|
* other kernel headers.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
/* It's interesting to measure the time spent withing locked regions, because
|
|
* this is the time that the system is deaf to interrupts.
|
|
*/
|
|
#if DEBUG_TIME_LOCKS
|
|
|
|
#define TIMING_POINTS 20 /* timing resolution */
|
|
#define TIMING_CATEGORIES 20
|
|
#define TIMING_NAME 10
|
|
|
|
/* Enable prints such as
|
|
* . send/receive failed due to deadlock or dead source or dead destination
|
|
* . trap not allowed
|
|
* . bogus message pointer
|
|
* . kernel call number not allowed by this process
|
|
*
|
|
* Of course the call still fails, but nothing is printed if these warnings
|
|
* are disabled.
|
|
*/
|
|
#define DEBUG_ENABLE_IPC_WARNINGS 0
|
|
|
|
/* Definition of the data structure to store lock() timing data. */
|
|
struct lock_timingdata {
|
|
char names[TIMING_NAME];
|
|
unsigned long lock_timings[TIMING_POINTS];
|
|
unsigned long lock_timings_range[2];
|
|
unsigned long binsize, resets, misses, measurements;
|
|
};
|
|
|
|
/* The data is declared here, but allocated in debug.c. */
|
|
extern struct lock_timingdata timingdata[TIMING_CATEGORIES];
|
|
|
|
/* Prototypes for the timing functionality. */
|
|
_PROTOTYPE( void timer_start, (int cat, char *name) );
|
|
_PROTOTYPE( void timer_end, (int cat) );
|
|
|
|
#define locktimestart(c, v) timer_start(c, v)
|
|
#define locktimeend(c) timer_end(c)
|
|
#else
|
|
#define locktimestart(c, v)
|
|
#define locktimeend(c)
|
|
#endif /* DEBUG_TIME_LOCKS */
|
|
|
|
/* The locking checks counts relocking situation, which are dangerous because
|
|
* the inner lock may unlock the outer one.
|
|
*/
|
|
#if DEBUG_LOCK_CHECK
|
|
#define lockcheck if (!(read_cpu_flags() & X86_FLAG_I)) kinfo.relocking++;
|
|
#else
|
|
#define lockcheck
|
|
#endif /* DEBUG_LOCK_CHECK */
|
|
|
|
/* This check makes sure that the scheduling queues are in a consistent state.
|
|
* The check is run when the queues are updated with ready() and unready().
|
|
*/
|
|
#if DEBUG_SCHED_CHECK
|
|
_PROTOTYPE( void check_runqueues, (char *when) );
|
|
#endif /* DEBUG_SCHED_CHECK */
|
|
|
|
/* The timing and checking of kernel locking requires a redefine of the lock()
|
|
* and unlock() macros. That's done here. This redefine requires that this
|
|
* header is included after the other kernel headers.
|
|
*/
|
|
#if (DEBUG_TIME_LOCKS || DEBUG_LOCK_CHECK)
|
|
# undef lock
|
|
# define lock(c, v) do { lockcheck; \
|
|
intr_disable(); \
|
|
locktimestart(c, v); \
|
|
} while(0)
|
|
# undef unlock
|
|
# define unlock(c) do { locktimeend(c); \
|
|
intr_enable();\
|
|
} while(0)
|
|
#endif
|
|
|
|
#endif /* DEBUG_H */
|