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Linux 6.1 introduced `MADV_COLLAPSE` flag to perform a best-effort synchronous collapse of the native pages mapped by the memory range into transparent huge pages. Synchronous hugification might be beneficial for at least two reasons: we are not relying on khugepaged anymore and get an instant feedback if range wasn't hugified. If `hpa_hugify_sync` option is on, we'll try to perform synchronously collapse and if it wasn't successful, we'll fallback to asynchronous behaviour. |
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