Re: [patch 0/2] x86,pat: Reduce contention on the memtype_lock -V4
From: Andi Kleen
Date: Tue Mar 23 2010 - 22:16:21 EST
holt@xxxxxxx 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@xxxxxxxxxxxxxxx -- Speaking for myself only.
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