Date: Sat, 22 Dec 2007 02:50:13 GMT From: John Birrell <jb@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 131405 for review Message-ID: <200712220250.lBM2oD0Y096628@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=131405 Change 131405 by jb@jb_freebsd1 on 2007/12/22 02:49:22 Add the dtrace_gethrtime functions to get the number of nanoseconds since boot on the current CPU. Affected files ... .. //depot/projects/dtrace/src/sys/amd64/amd64/tsc.c#5 edit .. //depot/projects/dtrace/src/sys/i386/i386/tsc.c#11 edit Differences ... ==== //depot/projects/dtrace/src/sys/amd64/amd64/tsc.c#5 (text+ko) ==== @@ -28,6 +28,7 @@ __FBSDID("$FreeBSD: src/sys/amd64/amd64/tsc.c,v 1.208 2007/06/04 18:25:01 dwmalone Exp $"); #include "opt_clock.h" +#include "opt_kdtrace.h" #include <sys/param.h> #include <sys/bus.h> @@ -44,6 +45,10 @@ #include <machine/md_var.h> #include <machine/specialreg.h> +#ifdef KDTRACE_HOOKS +#include <sys/dtrace_bsd.h> +#endif + #include "cpufreq_if.h" uint64_t tsc_freq; @@ -220,3 +225,18 @@ { return (rdtsc()); } + +#ifdef KDTRACE_HOOKS +/* + * DTrace needs a high resolution time function which can + * be called from a probe context and guaranteed not to have + * instrumented with probes itself. + * + * Returns nanoseconds since boot. + */ +uint64_t +dtrace_gethrtime() +{ + return (rdtsc() * (uint64_t) 1000000000 / tsc_freq); +} +#endif ==== //depot/projects/dtrace/src/sys/i386/i386/tsc.c#11 (text+ko) ==== @@ -28,6 +28,7 @@ __FBSDID("$FreeBSD: src/sys/i386/i386/tsc.c,v 1.208 2007/06/04 18:25:06 dwmalone Exp $"); #include "opt_clock.h" +#include "opt_kdtrace.h" #include <sys/param.h> #include <sys/bus.h> @@ -44,6 +45,10 @@ #include <machine/md_var.h> #include <machine/specialreg.h> +#ifdef KDTRACE_HOOKS +#include <sys/dtrace_bsd.h> +#endif + #include "cpufreq_if.h" uint64_t tsc_freq; @@ -244,3 +249,18 @@ { return (rdtsc()); } + +#ifdef KDTRACE_HOOKS +/* + * DTrace needs a high resolution time function which can + * be called from a probe context and guaranteed not to have + * instrumented with probes itself. + * + * Returns nanoseconds since boot. + */ +uint64_t +dtrace_gethrtime() +{ + return (rdtsc() * (uint64_t) 1000000000 / tsc_freq); +} +#endif
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