Chapter 29 `fpuinfo` Provider

The fpuinfo provider makes available probes that correspond to the simulation of floating-point instructions on SPARC microprocessors. While most floating-point instructions are executed in hardware, some floating-point operations trap into the operating system for simulation. The conditions under which floating-point operations require operating system simulation are specific to a microprocessor implementation. The operations that require simulation are rare. However, if an application uses one of these operations frequently, the effect on performance could be severe. The fpuinfo provider enables rapid investigation of floating-point simulation seen through either kstat(1M) and the fpu_info kernel statistic or trapstat(1M) and the fp-xcp-other trap.

Probes

The fpuinfo provider makes available a probe for each type of floating-point instruction that can be simulated. The fpuinfo provider has a Name Stability of CPU; the names of the probes are specific to a microprocessor implementation, and might not be available on different microprocessors within the same family. For example, some of the probes listed might only be available on UltraSPARC-III and not UltraSPARC-III+ or vice versa.

The fpuinfo probes are described in Table 29–1.

Table 29–1 fpuinfo Probes


`fpu_sim_fitoq`	Probe that fires whenever an `fitoq` instruction is simulated by the kernel.
`fpu_sim_fitod`	Probe that fires whenever an `fitod` instruction is simulated by the kernel.
`fpu_sim_fitos`	Probe that fires whenever an `fitos` instruction is simulated by the kernel.
`fpu_sim_fxtoq`	Probe that fires whenever an `fxtoq` instruction is simulated by the kernel.
`fpu_sim_fxtod`	Probe that fires whenever an `fxtod` instruction is simulated by the kernel.
`fpu_sim_fxtos`	Probe that fires whenever an `fxtos` instruction is simulated by the kernel.
`fpu_sim_fqtox`	Probe that fires whenever an `fqtox` instruction is simulated by the kernel.
`fpu_sim_fdtox`	Probe that fires whenever an `fdtox` instruction is simulated by the kernel.
`fpu_sim_fstox`	Probe that fires whenever an `fstox` instruction is simulated by the kernel.
`fpu_sim_fqtoi`	Probe that fires whenever an `fqtoi` instruction is simulated by the kernel.
`fpu_sim_fdtoi`	Probe that fires whenever an `fdtoi` instruction is simulated by the kernel.
`fpu_sim_fstoi`	Probe that fires whenever an `fstoi` instruction is simulated by the kernel.
`fpu_sim_fsqrtq`	Probe that fires whenever an `fsqrtq` instruction is simulated by the kernel.
`fpu_sim_fsqrtd`	Probe that fires whenever an `fsqrtd` instruction is simulated by the kernel.
`fpu_sim_fsqrts`	Probe that fires whenever an `fsqrts` instruction is simulated by the kernel.
`fpu_sim_fcmpeq`	Probe that fires whenever an `fcmpeq` instruction is simulated by the kernel.
`fpu_sim_fcmped`	Probe that fires whenever an `fcmped` instruction is simulated by the kernel.
`fpu_sim_fcmpes`	Probe that fires whenever an `fcmpes` instruction is simulated by the kernel.
`fpu_sim_fcmpq`	Probe that fires whenever an `fcmpq` instruction is simulated by the kernel.
`fpu_sim_fcmpd`	Probe that fires whenever an `fcmpd` instruction is simulated by the kernel.
`fpu_sim_fcmps`	Probe that fires whenever an `fcmps` instruction is simulated by the kernel.
`fpu_sim_fdivq`	Probe that fires whenever an `fdivq` instruction is simulated by the kernel.
`fpu_sim_fdivd`	Probe that fires whenever an `fdivd` instruction is simulated by the kernel.
`fpu_sim_fdivs`	Probe that fires whenever an `fdivs` instruction is simulated by the kernel.
`fpu_sim_fdmulx`	Probe that fires whenever an `fdmulx` instruction is simulated by the kernel.
`fpu_sim_fsmuld`	Probe that fires whenever an `fsmuld` instruction is simulated by the kernel.
`fpu_sim_fmulq`	Probe that fires whenever an `fmulq` instruction is simulated by the kernel.
`fpu_sim_fmuld`	Probe that fires whenever an `fmuld` instruction is simulated by the kernel.
`fpu_sim_fmuls`	Probe that fires whenever an `fmuls` instruction is simulated by the kernel.
`fpu_sim_fsubq`	Probe that fires whenever an `fsubq` instruction is simulated by the kernel.
`fpu_sim_fsubd`	Probe that fires whenever an `fsubd` instruction is simulated by the kernel.
`fpu_sim_fsubs`	Probe that fires whenever an `fsubs` instruction is simulated by the kernel.
`fpu_sim_faddq`	Probe that fires whenever an `faddq` instruction is simulated by the kernel.
`fpu_sim_faddd`	Probe that fires whenever an `faddd` instruction is simulated by the kernel.
`fpu_sim_fadds`	Probe that fires whenever an `fadds` instruction is simulated by the kernel.
`fpu_sim_fnegd`	Probe that fires whenever an `fnegd` instruction is simulated by the kernel.
`fpu_sim_fnegq`	Probe that fires whenever an `fneqq` instruction is simulated by the kernel.
`fpu_sim_fnegs`	Probe that fires whenever an `fnegs` instruction is simulated by the kernel.
`fpu_sim_fabsd`	Probe that fires whenever an `fabsd` instruction is simulated by the kernel.
`fpu_sim_fabsq`	Probe that fires whenever an `fabsq` instruction is simulated by the kernel.
`fpu_sim_fabss`	Probe that fires whenever an `fabss` instruction is simulated by the kernel.
`fpu_sim_fmovd`	Probe that fires whenever an `fmovd` instruction is simulated by the kernel.
`fpu_sim_fmovq`	Probe that fires whenever an `fmovq` instruction is simulated by the kernel.
`fpu_sim_fmovs`	Probe that fires whenever an `fmovs` instruction is simulated by the kernel.
`fpu_sim_fmovr`	Probe that fires whenever an `fmovr` instruction is simulated by the kernel.
`fpu_sim_fmovcc`	Probe that fires whenever an `fmovcc` instruction is simulated by the kernel.

Arguments

There are no arguments to fpuinfo probes.

Stability

The fpuinfo provider uses DTrace's stability mechanism to describe its stabilities, as shown in the following table. For more information about the stability mechanism, see Chapter 39, Stability.

Element	Name stability	Data stability	Dependency class
Provider	Evolving	Evolving	CPU
Module	Private	Private	Unknown
Function	Private	Private	Unknown
Name	Evolving	Evolving	CPU
Arguments	Evolving	Evolving	CPU

Innerhalb

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Support-Ressourcen

Chapter 29 fpuinfo Provider

Probes

Arguments

Stability

Chapter 29 `fpuinfo` Provider