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