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SubjectRe: [patch 0/2] x86,pat: Reduce contention on the memtype_lock -V4
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holt@sgi.com writes:

> Tracking memtype on x86 uses a single global spin_lock for either reading
> or changing the memory type. This includes changes made to page flags
> which is perfectly parallel.
>
> Part one of the patchset makes the page-based tracking use cmpxchg
> without a need for a lock.
>
> Part two of the patchset converts the spin_lock into a read/write lock.

I'm curious: in what workloads did you see contention?

For any scalability patches it would be always good to have a description
of the workload.

-Andi

--
ak@linux.intel.com -- Speaking for myself only.


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