Implement the D "cpu" variable, which returns curcpu. I have chosen not
to follow the example of OpenSolaris and its descendants, which implemented cpu as an inline that took a value out of curthread. At certain points in the FreeBSD scheduler curthread->td_oncpu will no longer be valid (in particukar, just before the thread gets descheduled) so instead I have implemented this as its own built-in variable. Sponsored by: Sandvine Inc. MFC after: 1 week
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5293615570
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=234691
@ -497,6 +497,12 @@ static const dt_ident_t _dtrace_globals[] = {
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{ "zonename", DT_IDENT_SCALAR, 0, DIF_VAR_ZONENAME,
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DT_ATTR_STABCMN, DT_VERS_1_0, &dt_idops_type, "string" },
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#endif
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#if !defined(sun)
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{ "cpu", DT_IDENT_SCALAR, 0, DIF_VAR_CPU,
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DT_ATTR_STABCMN, DT_VERS_1_6_3, &dt_idops_type, "int" },
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#endif
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{ NULL, 0, 0, 0, { 0, 0, 0 }, 0, NULL, NULL }
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};
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@ -3143,6 +3143,11 @@ dtrace_dif_variable(dtrace_mstate_t *mstate, dtrace_state_t *state, uint64_t v,
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return (curthread->td_errno);
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#endif
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}
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#if !defined(sun)
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case DIF_VAR_CPU: {
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return curcpu;
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}
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#endif
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default:
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DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
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return (0);
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@ -251,6 +251,10 @@ typedef enum dtrace_probespec {
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#define DIF_VAR_ERRNO 0x0120 /* thread errno */
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#define DIF_VAR_EXECARGS 0x0121 /* process arguments */
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#if !defined(sun)
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#define DIF_VAR_CPU 0x0200
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#endif
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#define DIF_SUBR_RAND 0
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#define DIF_SUBR_MUTEX_OWNED 1
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#define DIF_SUBR_MUTEX_OWNER 2
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