Messages in this thread | | | Subject | Re: [patch v3]numa: add a sysctl to control interleave allocation granularity from each node to improve I/O performance | From | Shaohua Li <> | Date | Wed, 14 Dec 2011 10:33:47 +0800 |
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On Wed, 2011-12-14 at 04:38 +0800, Andi Kleen wrote: > On Tue, Dec 13, 2011 at 02:12:58PM -0600, Christoph Lameter wrote: > > On Tue, 13 Dec 2011, Andi Kleen wrote: > > > > > I would prefer to add a new policy (INTERLEAVE_MULTI or so) for this > > > instead of a global sysctl, that takes the additional parameter. > > > > That would require a change of all scripts and code that uses > > MPOL_INTERLEAVE. Lets not do that. > > Yes, but setting a sysctl would need the same right? > > It's not clear that all workloads want this. > > With a global switch only you cannot set it case by case. That's what I want to avoid letting each apps to explicitly do it, it's a lot of burden. That's true only workload with heavy I/O wants this. but I don't expect it will harm other workloads.
>> Also I don't like having more per task state. Could you compute this >> from the address instead even for the process policy case? > >That sounds good. the process policy case doesn't give an address for allocation.
Thanks, Shaohua
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