smp: disable mlock on overcommit #2575
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Memory locking keeps pages in physical memory, and decreases the amount of pages available for swapping on an overcommit setup. Thus, it can decrease fairness, increase memory pressure, and cause OOMs. So, it is less suitable for a cooperative overcommit setup. This change disables memory locking on overcommit (overprovisioned - I hope I can rename that config). Also, it reuses the mlock variable. I assume that this change shouldn't break reasonable configs.
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Memory locking keeps pages in physical memory, and decreases the amount of pages available for swapping on an overcommit setup. Thus, it can decrease fairness, increase memory pressure, and cause OOMs. So, it is less suitable for a cooperative overcommit setup.
This change disables memory locking on overcommit (overprovisioned - I hope I can rename that config). Also, it reuses the mlock variable. I assume that this change shouldn't break reasonable configs.