- Remove much of the inlining of the KTR tracepoints into a ktr_tracepoint()
function declared in kern_ktr.c. The only inline checks left are the checks that compare KTR_COMPILE with the supplied mask and thus should be optimized away into either nothing or a direct call to ktr_tracepoint(). - Move several KTR-related options to opt_ktr.h now that they are only needed by kern_ktr.c and not by ktr.h. - Add in the ktr_verbose functionality if KTR_EXTEND is turned on. If the global variable 'ktr_verbose' is non-zero, then KTR messages will be dumped to the console. This variable can be set by either kernel code or via the 'debug.ktr_verbose' sysctl. It defaults to off unless the KTR_VERBOSE kernel option is specified in which case it defaults to on. This can be useful when the machine locks up spinning in a loop with interrupts disabled as you might be able to see what it is doing when it locks up. Requested by: phk
This commit is contained in:
parent
7d1fae05bb
commit
d8f03321bd
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@ -461,11 +461,12 @@ PCFCLOCK_MAX_RETRIES opt_pcfclock.h
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TDFX_LINUX opt_tdfx.h
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KTR opt_global.h
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KTR_MASK opt_global.h
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KTR_CPUMASK opt_global.h
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KTR_MASK opt_ktr.h
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KTR_CPUMASK opt_ktr.h
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KTR_COMPILE opt_global.h
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KTR_ENTRIES opt_global.h
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KTR_EXTEND opt_global.h
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KTR_VERBOSE opt_ktr.h
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MUTEX_DEBUG opt_global.h
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WITNESS opt_global.h
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WITNESS_DDB opt_witness.h
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@ -30,14 +30,34 @@
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*/
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/*
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* This module holds the global variables used by KTR.
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* This module holds the global variables used by KTR and the ktr_tracepoint()
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* function that does the actual tracing.
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*/
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#include "opt_ktr.h"
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/ktr.h>
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#include <sys/libkern.h>
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#include <sys/linker_set.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <machine/stdarg.h>
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#ifndef KTR_MASK
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#define KTR_MASK (KTR_GEN)
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#endif
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#ifndef KTR_CPUMASK
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#define KTR_CPUMASK (~0)
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#endif
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#ifdef SMP
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#define KTR_CPU cpuid
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#else
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#define KTR_CPU 0
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#endif
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#ifdef KTR_EXTEND
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/*
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@ -49,7 +69,7 @@ SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 1, "");
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#else
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int ktr_extend = 0;
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SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 0, "");
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#endif
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#endif /* KTR_EXTEND */
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int ktr_cpumask = KTR_CPUMASK;
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SYSCTL_INT(_debug, OID_AUTO, ktr_cpumask, CTLFLAG_RW, &ktr_cpumask, KTR_CPUMASK, "");
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@ -62,3 +82,67 @@ SYSCTL_INT(_debug, OID_AUTO, ktr_entries, CTLFLAG_RD, &ktr_entries, KTR_ENTRIES,
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volatile int ktr_idx = 0;
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struct ktr_entry ktr_buf[KTR_ENTRIES];
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#ifdef KTR_VERBOSE
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int ktr_verbose = 1;
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#else
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int ktr_verbose = 0;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, ktr_verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
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#ifdef KTR
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#ifdef KTR_EXTEND
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void
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ktr_tracepoint(u_int mask, char *filename, u_int line, char *format, ...)
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#else
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void
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ktr_tracepoint(u_int mask, char *format, u_long arg1, u_long arg2, u_long arg3,
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u_long arg4, u_long arg5)
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#endif
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{
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struct ktr_entry *entry;
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int newindex, saveindex, saveintr;
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#ifdef KTR_EXTEND
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va_list ap;
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#endif
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if ((ktr_mask & mask) == 0)
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return;
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#ifdef KTR_EXTEND
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if (((1 << KTR_CPU) & ktr_cpumask) == 0)
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return;
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#endif
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saveintr = save_intr();
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disable_intr();
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do {
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saveindex = ktr_idx;
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newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
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} while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
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entry = &ktr_buf[saveindex];
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restore_intr(saveintr);
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nanotime(&entry->ktr_tv);
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#ifdef KTR_EXTEND
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strncpy(entry->ktr_filename, filename, KTRFILENAMESIZE - 1);
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entry->ktr_filename[KTRFILENAMESIZE - 1] = '\0';
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snprintf(entry->ktr_filename, KTRFILENAMESIZE, "%s", __FILE__);
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entry->ktr_line = line;
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entry->ktr_cpu = KTR_CPU;
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va_start(ap, format);
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vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap);
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va_end(ap);
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if (ktr_verbose) {
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va_start(ap, format);
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vprintf(format, ap);
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printf("\n");
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va_end(ap);
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}
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#else
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entry->ktr_desc = format;
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entry->ktr_parm1 = arg1;
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entry->ktr_parm2 = arg2;
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entry->ktr_parm3 = arg3;
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entry->ktr_parm4 = arg4;
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entry->ktr_parm5 = arg5;
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#endif
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}
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#endif /* KTR */
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165
sys/sys/ktr.h
165
sys/sys/ktr.h
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@ -85,14 +85,6 @@
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#define KTR_COMPILE (KTR_GEN)
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#endif
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#ifndef KTR_MASK
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#define KTR_MASK (KTR_GEN)
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#endif
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#ifndef KTR_CPUMASK
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#define KTR_CPUMASK (~0)
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#endif
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#ifndef LOCORE
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#include <sys/time.h>
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@ -126,6 +118,7 @@ extern int ktr_extend;
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extern int ktr_cpumask;
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extern int ktr_mask;
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extern int ktr_entries;
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extern int ktr_verbose;
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extern volatile int ktr_idx;
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extern struct ktr_entry ktr_buf[];
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@ -138,138 +131,38 @@ extern struct ktr_entry ktr_buf[];
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#endif
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#ifdef KTR_EXTEND
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#ifndef _TR_CPU
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#ifdef SMP
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#define _TR_CPU cpuid
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void ktr_tracepoint(u_int mask, char *filename, u_int line,
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char *format, ...);
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#else
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#define _TR_CPU 0
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void ktr_tracepoint(u_int mask, char *format, u_long arg1, u_long arg2,
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u_long arg3, u_long arg4, u_long arg5);
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#endif
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#endif
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#ifndef _TR
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#define _TR() \
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struct ktr_entry *_ktrptr; \
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int _ktr_newidx, _ktr_saveidx; \
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int _tr_intrsave = save_intr(); \
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disable_intr(); \
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do { \
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_ktr_saveidx = ktr_idx; \
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_ktr_newidx = (ktr_idx + 1) & (KTR_ENTRIES - 1); \
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} while (atomic_cmpset_int(&ktr_idx, _ktr_saveidx, _ktr_newidx) == 0); \
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_ktrptr = &ktr_buf[_ktr_saveidx]; \
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restore_intr(_tr_intrsave); \
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nanotime(&_ktrptr->ktr_tv); \
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snprintf (_ktrptr->ktr_filename, KTRFILENAMESIZE, "%s", __FILE__); \
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_ktrptr->ktr_line = __LINE__; \
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_ktrptr->ktr_cpu = _TR_CPU;
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#endif
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#define CTR0(m, _desc) \
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if (KTR_COMPILE & (m)) { \
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if ((ktr_mask & (m)) && ((1 << _TR_CPU) & ktr_cpumask)) { \
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_TR() \
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memcpy (_ktrptr->ktr_desc, _desc, KTRDESCSIZE); \
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} \
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}
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#define CTR1(m, _desc, _p1) \
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if (KTR_COMPILE & (m)) { \
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if ((ktr_mask & (m)) && ((1 << _TR_CPU) & ktr_cpumask)) { \
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_TR() \
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snprintf (_ktrptr->ktr_desc, KTRDESCSIZE, _desc, _p1); \
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} \
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}
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#define CTR2(m, _desc, _p1, _p2) \
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if (KTR_COMPILE & (m)) { \
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if ((ktr_mask & (m)) && ((1 << _TR_CPU) & ktr_cpumask)) { \
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_TR() \
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snprintf (_ktrptr->ktr_desc, KTRDESCSIZE, _desc, _p1, _p2); \
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} \
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}
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#define CTR3(m, _desc, _p1, _p2, _p3) \
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if (KTR_COMPILE & (m)) { \
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if ((ktr_mask & (m)) && ((1 << _TR_CPU) & ktr_cpumask)) { \
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_TR() \
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snprintf (_ktrptr->ktr_desc, KTRDESCSIZE, _desc, _p1, _p2, _p3); \
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} \
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}
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#define CTR4(m, _desc, _p1, _p2, _p3, _p4) \
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if (KTR_COMPILE & (m)) { \
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if ((ktr_mask & (m)) && ((1 << _TR_CPU) & ktr_cpumask)) { \
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_TR() \
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snprintf (_ktrptr->ktr_desc, KTRDESCSIZE, _desc, _p1, _p2, _p3, _p4); \
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} \
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}
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#define CTR5(m, _desc, _p1, _p2, _p3, _p4, _p5) \
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if (KTR_COMPILE & (m)) { \
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if ((ktr_mask & (m)) && ((1 << _TR_CPU) & ktr_cpumask)) { \
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_TR() \
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snprintf (_ktrptr->ktr_desc, KTRDESCSIZE, _desc, _p1, _p2, _p3, _p4, _p5); \
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} \
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}
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#ifdef KTR_EXTEND
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#define CTR(m, format, args...) do { \
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if (KTR_COMPILE & (m)) \
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ktr_tracepoint((m), __FILE__, __LINE__, format , ##args); \
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} while(0)
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#define CTR0(m, format) CTR(m, format)
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#define CTR1(m, format, p1) CTR(m, format, p1)
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#define CTR2(m, format, p1, p2) CTR(m, format, p1, p2)
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#define CTR3(m, format, p1, p2, p3) CTR(m, format, p1, p2, p3)
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#define CTR4(m, format, p1, p2, p3, p4) CTR(m, format, p1, p2, p3, p4)
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#define CTR5(m, format, p1, p2, p3, p4, p5) \
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CTR(m, format, p1, p2, p3, p4, p5)
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#else /* not extended */
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#ifndef _TR
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#define _TR(_desc) \
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struct ktr_entry *_ktrptr; \
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int _ktr_newidx, _ktr_saveidx; \
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do { \
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_ktr_saveidx = ktr_idx; \
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_ktr_newidx = (ktr_idx + 1) & (KTR_ENTRIES - 1); \
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} while (atomic_cmpset_int(&ktr_idx, _ktr_saveidx, _ktr_newidx) == 0); \
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_ktrptr = &ktr_buf[_ktr_saveidx]; \
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nanotime(&_ktrptr->ktr_tv); \
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_ktrptr->ktr_desc = (_desc);
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#endif
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#define CTR0(m, _desc) \
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if (KTR_COMPILE & (m)) { \
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if (ktr_mask & (m)) { \
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_TR(_desc) \
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} \
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}
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#define CTR1(m, _desc, _p1) \
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if (KTR_COMPILE & (m)) { \
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if (ktr_mask & (m)) { \
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_TR(_desc) \
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_ktrptr->ktr_parm1 = (u_long)(_p1); \
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} \
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}
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#define CTR2(m, _desc, _p1, _p2) \
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if (KTR_COMPILE & (m)) { \
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if (ktr_mask & (m)) { \
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_TR(_desc) \
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_ktrptr->ktr_parm1 = (u_long)(_p1); \
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_ktrptr->ktr_parm2 = (u_long)(_p2); \
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} \
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}
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#define CTR3(m, _desc, _p1, _p2, _p3) \
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if (KTR_COMPILE & (m)) { \
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if (ktr_mask & (m)) { \
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_TR(_desc) \
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_ktrptr->ktr_parm1 = (u_long)(_p1); \
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_ktrptr->ktr_parm2 = (u_long)(_p2); \
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_ktrptr->ktr_parm3 = (u_long)(_p3); \
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} \
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}
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#define CTR4(m, _desc, _p1, _p2, _p3, _p4) \
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if (KTR_COMPILE & (m)) { \
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if (ktr_mask & (m)) { \
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_TR(_desc) \
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_ktrptr->ktr_parm1 = (u_long)(_p1); \
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_ktrptr->ktr_parm2 = (u_long)(_p2); \
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_ktrptr->ktr_parm3 = (u_long)(_p3); \
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_ktrptr->ktr_parm4 = (u_long)(_p4); \
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} \
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}
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#define CTR5(m, _desc, _p1, _p2, _p3, _p4, _p5) \
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if (KTR_COMPILE & (m)) { \
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if (ktr_mask & (m)) { \
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_TR(_desc) \
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_ktrptr->ktr_parm1 = (u_long)(_p1); \
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_ktrptr->ktr_parm2 = (u_long)(_p2); \
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_ktrptr->ktr_parm3 = (u_long)(_p3); \
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_ktrptr->ktr_parm4 = (u_long)(_p4); \
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_ktrptr->ktr_parm5 = (u_long)(_p5); \
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} \
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}
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#endif
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#define CTR5(m, format, p1, p2, p3, p4, p5) do { \
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if (KTR_COMPILE & (m)) \
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ktr_tracepoint((m), format, (u_long)p1, (u_long)p2, \
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(u_long)p3, (u_long)p4, (u_long)p5); \
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} while(0)
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#define CTR0(m, format) CTR5(m, format, 0, 0, 0, 0, 0)
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#define CTR1(m, format, p1) CTR5(m, format, p1, 0, 0, 0, 0)
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#define CTR2(m, format, p1, p2) CTR5(m, format, p1, p2, 0, 0, 0)
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#define CTR3(m, format, p1, p2, p3) CTR5(m, format, p1, p2, p3, 0, 0)
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#define CTR4(m, format, p1, p2, p3, p4) CTR5(m, format, p1, p2, p3, p4, 0)
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#endif /* KTR_EXTEND */
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#else /* KTR */
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#undef KTR_COMPILE
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#define KTR_COMPILE 0
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