On Fri, 2007-12-14 at 09:47 +0100, Peter Zijlstra wrote:
> How about something like this:
>
> diff --git a/lib/proportions.c b/lib/proportions.c
> index 332d8c5..4afb330 100644
> --- a/lib/proportions.c
> +++ b/lib/proportions.c
> @@ -190,6 +190,8 @@ prop_adjust_shift(int *pl_shift, unsigned lon
On Fri, 2007-12-14 at 16:26 +0800, zhejiang wrote:
> On Thu, 2007-12-13 at 22:54 +0100, Peter Zijlstra wrote:
> > On Thu, 2007-12-13 at 11:30 +0800, zhejiang wrote:
> > > __percpu_counter_add() cache the result in percpu variable until it
> > > exceeds the batch.
> > > The prop_norm_percpu() use t
On Thu, 2007-12-13 at 22:54 +0100, Peter Zijlstra wrote:
> On Thu, 2007-12-13 at 11:30 +0800, zhejiang wrote:
> > __percpu_counter_add() cache the result in percpu variable until it
> > exceeds the batch.
> > The prop_norm_percpu() use the percpu_counter_read(&pl->events) to read
> > the counter ,a
On Thu, 2007-12-13 at 11:30 +0800, zhejiang wrote:
> __percpu_counter_add() cache the result in percpu variable until it
> exceeds the batch.
> The prop_norm_percpu() use the percpu_counter_read(&pl->events) to read
> the counter ,and use percpu_counter_add(&pl->events, -half) to half the
> counte
__percpu_counter_add() cache the result in percpu variable until it
exceeds the batch.
The prop_norm_percpu() use the percpu_counter_read(&pl->events) to read
the counter ,and use percpu_counter_add(&pl->events, -half) to half the
counter.
There are potential problems:
1.The counter may be negativ
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