Re: [RFC PATCH 00/19] Cleanup and optimise the page allocator V2

[Peter Zijlstra]

On Wed, 2009-03-04 at 10:05 +0800, Zhang, Yanmin wrote:
> FAIR_GROUP_SCHED is a feature to support configurable cpu weight for different users.
> We did find it takes lots of time to check/update the share weight which might create
> lots of cache ping-pang. With sysbench(oltp)+mysql, that becomes more severe because
> mysql runs as user mysql and sysbench runs as another regular user. When starting
> the testing with 1 thread in command line, there are 2 mysql threads and 1 sysbench
> thread are proactive.

cgroup based group scheduling doesn't bother with users. So unless you
create sched-cgroups your should all be in the same (root) group.

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