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  • x86 split_lock: Enable split lock detection by kernel - LWN. net
    From: Peter Zijlstra <peterz@infradead org> A split-lock occurs when an atomic instruction operates on data that spans two cache lines In order to maintain atomicity the core takes a global bus lock
  • 22. Bus lock detection and handling - The Linux Kernel Archives
    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 CPU accesses the two cache lines
  • x86 - does atomic operation (c++) freeze cpu - Stack Overflow
    x86 allows writing unaligned data that spans across two cache lines (i e across two 64 byte chunks), but the result is not guaranteed to be atomic This means you may read 8 Byte from addr 0x1003c for e g , requiring the CPU to fetch 2 lines ( 0x10000 and 0x10040 ), taking the relevant 4-byte chunks and stitching them together
  • The Linux Kernel Will Be Able To Detect Split-Locks To Then Warn Or . . .
    Split locks are when an atomic instruction operates on data spanning multiple cache lines Due to the atomic nature, a global bus lock is needed when working on two cache lines and that in turn causes a big performance hit for the overall system performance
  • Cache Coherence and Atomic Operations in Hardware
    Cache Coherence and Atomic Operations in Hardware Previously, we introduced multi-core parallelism — Today we’ll look at 2 things: 1 Cache coherence 2 Instruction support for synchronization — And some pitfalls of parallelization — And solve a few mysteries Intel Core i7
  • Why does atomic operation need exclusive cache access?
    In my understanding atomic operation (c++ atomic for example) first locks the cache line and then performs atomic operation
  • In-depth analysis of split locks, i++ can lead to disaster
    split lock is an atomic operation where the operand spans two cache lines bus lock can be generated in two cases, either split lock for writeback memory, or any lock operation for non-writeback memory
  • The Linux Kernel Archives
    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 locked access to writeback (WB) memory or any locked access to non-WB memory
  • Aligned AVX loads and stores are atomic - Rigtorp
    Instruction that fetched 256-bit data from memory should pay attention to be 32-byte aligned If a 32-byte unaligned fetch would span across cache line boundary, it is still preferable to fetch data from two 16-byte aligned address instead ” ↩︎
  • CS350: Operating Systems - Lecture 5: Synchronization
    Each cache line is one of three states: Modified (sometimes called Exclusive) I One cache has a valid copy I That copy is stale (needs to be written back to memory) I Must invalidate all copies before entering this state Shared I One or more caches (and memory) have a valid copy Invalid I Doesn’t contain any data Transitions can take 100





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