真正的bus lock 虚假的bus lock 在x86的平台上增加了split lock的检测事件，通过 PMU 能很容易的检测到当前系统的splitlock事件。 可以通过如下命令确定你的主机、kernel已经支持了split …

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Intel 64 and IA-32 processors provide a LOCK# signal that is asserted automatically during certain critical memory operations to lock the system bus or equivalent link. Assertion of this signal is …

bus lock signal 现在是按照cache line 对齐与否来决定是否lock bus. Cross cache-line的 atomic operation 会触发bus lock 从而锁住整个bus。 如果atomic operation 只在cache-line 内则只需要 …

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2021年3月22日 · Hardware only generates #DB for bus lock detect when CPL>0 to avoid nested #DB from multiple bus locks while the first #DB is being handled. Use the existing kernel …

2025年1月21日 · It's also useful for general computing to prevent guests or user applications from slowing down the overall system by executing instructions with bus lock. Guidance ===== off - …

The kernel #AC and #DB handlers handle bus lock based on the kernel parameter “split_lock_detect”. Here is a summary of different options: split_lock_detect=

Since the operand spans two cache lines and the operation must be atomic, the system locks the bus while the CPU accesses the two cache lines. A bus lock is acquired through either split …

A split lock is any atomic operation whose operand crosses two cache lines. Since the operand spans two cache lines and the operation must be atomic, the system locks the bus while the …