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MWAIT is a hint to the processor to enter an optimized state until a specified event or a store operation. It works with MONITOR instruction for address-range monitoring or power management. See CPUID, EAX, ECX, and C-states details.
These are all the uses of these instructions in the Linux kernel that I'm aware of. Uses of monitor / mwait for thread synchronization Starting with gcc 9 and kernel v5.3-rc1, the user-mode versions of mwait and monitor, called umwait and umonitor, are exposed through the _umwait and _umonitor intrinsics.
The MWAIT instruction is designed to operate with the MONITOR instruction. The two instructions allow the definition of an address at which to 'wait' (MONITOR) and an instruction that causes a predefined 'implementation-dependent-optimized operation' to commence at the 'wait' address (MWAIT).
intel_idle uses the MWAIT instruction to inform the processor that the logical CPU executing it is idle and so it may be possible to put some of the processor's functional blocks into low-power states.
timed_mwait_feat: contains the code that we reverse engineered the Intel's undocumented timed-mwait feature. comparison: contains the code that we constructed a standard benchmark for detecting fully asynchronous events with Transient-Writes-Monitor (TWM) and other conventional side-channel attacks for reference (Figure 1-2, Table 3).
The MONITOR instruction arms address monitoring hardware using an address specified in EAX (the address range that the monitoring hardware checks for store operations can be determined by using CPUID). A store to an address within the specified address range triggers the monitoring hardware. The state of monitor hardware is used by MWAIT.
mwait 指令 A hint that allows the processor to stop instruction execution and enter an implementation-dependent optimized state until occurrence of a class of events.MWAIT instruction provides hints to
Visual Studio extension for assembly syntax highlighting and code completion in assembly files and the disassembly window - HJLebbink/asm-dude
Additionally, the CPU programmer must expect spurious wakeups (MWAIT may wake before it's "supposed to"), and therefore use the instruction from within a polling loop. The remainder of this section discusses a variety of ways in which KVM can offer sufficient support for MONITOR and MWAIT to enable Mac OS X guest execution. 1.
The Monitor Wait "MWAIT" instruction can be used for power management purposes to hint that the processor can enter a specified target C state while waiting for an event or a MONITOR'ed store operation to complete. Usage of MWAIT is intended to be more efficient than the HALT instruction.