[ I fat-fingered the linux-mm Cc:, so every reply will bounce on that,
sorry about that :-/ Fixed it in this mail's Cc: list. ]
* Ingo Molnar <mi...@kernel.org> wrote:
> Waiman Long reported 'pgd_lock' contention on high CPU count systems and
> proposed moving pgd_lock on a separate cacheline to eliminate false sharing
> and
> to reduce some of the lock bouncing overhead.
So 'pgd_lock' is a global lock, used for every new task creation:
arch/x86/mm/fault.c:DEFINE_SPINLOCK(pgd_lock);
which with a sufficiently high CPU count starts to hurt.
Thanks,
Ingo
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