Re: [patch 1/2] cpuacct: refactoring cpuusage_read / cpuusage_write

[Ingo Molnar]

* Ken Chen <kenchen@xxxxxxxxxx> wrote:

> In the thread regarding to 'export percpu cpuacct cgroup stats'
> http://lkml.org/lkml/2008/12/7/13
> 
> akpm pointed out that current cpuacct code is inefficient.  This patch
> refactoring the following:
> 
> * make cpu_rq locking only on 32-bit
> * change iterator to each_present_cpu instead of each_possible_cpu to
>   make it hotplug friendly.
> 
> It's a bit of code churn, but I was rewarded with 160 byte code size saving
> on x86-64 arch and zero code size change on i386.

applied to tip/sched/core, thanks Ken!

	Ingo
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