Unit Instance

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{
    "translation": "https://translate-dev.freebsd.org/api/translations/documentation/booksarch-handbooksmp_index/en/?format=api",
    "source": [
        "Simply put, a thread migrates when it moves from one CPU to another. In a non-preemptive kernel this can only happen at well-defined points such as when calling `msleep` or returning to userland. However, in the preemptive kernel, an interrupt can force a preemption and possible migration at any time. This can have negative affects on per-CPU data since with the exception of `curthread` and `curpcb` the data can change whenever you migrate. Since you can potentially migrate at any time this renders unprotected per-CPU data access rather useless. Thus it is desirable to be able to disable migration for sections of code that need per-CPU data to be stable."
    ],
    "previous_source": "",
    "target": [
        "Simply put, a thread migrates when it moves from one CPU to another. In a non-preemptive kernel this can only happen at well-defined points such as when calling `msleep` or returning to userland. However, in the preemptive kernel, an interrupt can force a preemption and possible migration at any time. This can have negative affects on per-CPU data since with the exception of `curthread` and `curpcb` the data can change whenever you migrate. Since you can potentially migrate at any time this renders unprotected per-CPU data access rather useless. Thus it is desirable to be able to disable migration for sections of code that need per-CPU data to be stable."
    ],
    "id_hash": 5639549270827207817,
    "content_hash": 5639549270827207817,
    "location": "documentation/content/en/books/arch-handbook/smp/_index.adoc:137",
    "context": "",
    "note": "type: Plain text",
    "flags": "",
    "labels": [],
    "state": 100,
    "fuzzy": false,
    "translated": true,
    "approved": false,
    "position": 45,
    "has_suggestion": false,
    "has_comment": false,
    "has_failing_check": false,
    "num_words": 110,
    "source_unit": "https://translate-dev.freebsd.org/api/units/1134250/?format=api",
    "priority": 100,
    "id": 1134250,
    "web_url": "https://translate-dev.freebsd.org/translate/documentation/booksarch-handbooksmp_index/en/?checksum=ce43b42ea4f80c89",
    "url": "https://translate-dev.freebsd.org/api/units/1134250/?format=api",
    "explanation": "",
    "extra_flags": "",
    "pending": false,
    "timestamp": "2021-05-23T13:16:47.186504Z"
}