svn commit: r244093 - in stable/9/sys: cddl/dev/dtrace/amd64 cddl/dev/dtrace/i386 kern

[George V. Neville-Neil]

Author: gnn
Date: Mon Dec 10 19:33:39 2012
New Revision: 244093
URL: http://svnweb.freebsd.org/changeset/base/244093

Log:
  MFC: 238537,238552
  Add support for walltimestamp in DTrace.
  
  Submitted by: Fabian Keil
  Includes correction by: avg

Modified:
  stable/9/sys/cddl/dev/dtrace/amd64/dtrace_subr.c
  stable/9/sys/cddl/dev/dtrace/i386/dtrace_subr.c
  stable/9/sys/kern/kern_tc.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/cddl/dev/dtrace/amd64/dtrace_subr.c
==============================================================================
--- stable/9/sys/cddl/dev/dtrace/amd64/dtrace_subr.c    Mon Dec 10 17:56:51 
2012        (r244092)
+++ stable/9/sys/cddl/dev/dtrace/amd64/dtrace_subr.c    Mon Dec 10 19:33:39 
2012        (r244093)
@@ -43,6 +43,8 @@
 extern uintptr_t       dtrace_in_probe_addr;
 extern int             dtrace_in_probe;
 
+extern void dtrace_getnanotime(struct timespec *tsp);
+
 int dtrace_invop(uintptr_t, uintptr_t *, uintptr_t);
 
 typedef struct dtrace_invop_hdlr {
@@ -456,8 +458,11 @@ dtrace_gethrtime()
 uint64_t
 dtrace_gethrestime(void)
 {
-       printf("%s(%d): XXX\n",__func__,__LINE__);
-       return (0);
+       struct timespec current_time;
+
+       dtrace_getnanotime(&current_time);
+
+       return (current_time.tv_sec * 1000000000ULL + current_time.tv_nsec);
 }
 
 /* Function to handle DTrace traps during probes. See amd64/amd64/trap.c */

Modified: stable/9/sys/cddl/dev/dtrace/i386/dtrace_subr.c
==============================================================================
--- stable/9/sys/cddl/dev/dtrace/i386/dtrace_subr.c     Mon Dec 10 17:56:51 
2012        (r244092)
+++ stable/9/sys/cddl/dev/dtrace/i386/dtrace_subr.c     Mon Dec 10 19:33:39 
2012        (r244093)
@@ -45,6 +45,8 @@ extern uintptr_t      kernelbase;
 extern uintptr_t       dtrace_in_probe_addr;
 extern int             dtrace_in_probe;
 
+extern void dtrace_getnanotime(struct timespec *tsp);
+
 int dtrace_invop(uintptr_t, uintptr_t *, uintptr_t);
 
 typedef struct dtrace_invop_hdlr {
@@ -457,8 +459,11 @@ dtrace_gethrtime()
 uint64_t
 dtrace_gethrestime(void)
 {
-       printf("%s(%d): XXX\n",__func__,__LINE__);
-       return (0);
+       struct timespec current_time;
+
+       dtrace_getnanotime(&current_time);
+
+       return (current_time.tv_sec * 1000000000ULL + current_time.tv_nsec);
 }
 
 /* Function to handle DTrace traps during probes. See i386/i386/trap.c */

Modified: stable/9/sys/kern/kern_tc.c
==============================================================================
--- stable/9/sys/kern/kern_tc.c Mon Dec 10 17:56:51 2012        (r244092)
+++ stable/9/sys/kern/kern_tc.c Mon Dec 10 19:33:39 2012        (r244093)
@@ -110,6 +110,8 @@ SYSCTL_INT(_kern_timecounter, OID_AUTO, 
 static void tc_windup(void);
 static void cpu_tick_calibrate(int);
 
+void dtrace_getnanotime(struct timespec *tsp);
+
 static int
 sysctl_kern_boottime(SYSCTL_HANDLER_ARGS)
 {
@@ -303,6 +305,24 @@ getmicrotime(struct timeval *tvp)
 }
 
 /*
+ * This is a clone of getnanotime and used for walltimestamps.
+ * The dtrace_ prefix prevents fbt from creating probes for
+ * it so walltimestamp can be safely used in all fbt probes.
+ */
+void
+dtrace_getnanotime(struct timespec *tsp)
+{
+       struct timehands *th;
+       u_int gen;
+
+       do {
+               th = timehands;
+               gen = th->th_generation;
+               *tsp = th->th_nanotime;
+       } while (gen == 0 || gen != th->th_generation);
+}
+
+/*
  * Initialize a new timecounter and possibly use it.
  */
 void
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