On 03/07/2016 01:24 PM, Christoph Lameter wrote:
On Fri, 4 Mar 2016, Waiman Long wrote:
This patch provides a mechanism to selectively degenerate per-cpu
counters to global counters at per-cpu counter initialization time. The
following new API is added:
percpu_counter_set_limit(struct percp
On Wed, 16 Mar 2016, Waiman Long wrote:
> > If the cpumask is empty you can use the global count. Otherwise you just
> > need to add up the counters of the cpus set in the cpumask.
> >
>
> I have modified the patch to try that out. However, that doesn't yield that
> much of improvement in term of
On 03/07/2016 01:24 PM, Christoph Lameter wrote:
On Fri, 4 Mar 2016, Waiman Long wrote:
This patch provides a mechanism to selectively degenerate per-cpu
counters to global counters at per-cpu counter initialization time. The
following new API is added:
percpu_counter_set_limit(struct percp
On Fri, 4 Mar 2016, Waiman Long wrote:
> This patch provides a mechanism to selectively degenerate per-cpu
> counters to global counters at per-cpu counter initialization time. The
> following new API is added:
>
> percpu_counter_set_limit(struct percpu_counter *fbc,
>
Per-cpu counters are used in quite a number of places within
the kernel. On large system with a lot of CPUs, however, doing a
percpu_counter_sum() can be very expensive as nr_cpu cachelines will
need to be read. In __percpu_counter_compare(), the chance of calling
percpu_counter_sum() also increas
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