On Fri, May 04, 2012 at 12:39:20AM +0200, Jan Kara wrote:
> Convert calculations of proportion of writeback each bdi does to new flexible
> proportion code. That allows us to use aging period of fixed wallclock time
> which gives better proportion estimates given the hugely varying throughput of
> different devices.
>
> Signed-off-by: Jan Kara <jack@xxxxxxx>
> ---
> include/linux/backing-dev.h | 6 ++--
> mm/backing-dev.c | 5 +--
> mm/page-writeback.c | 80 ++++++++++++++++++++----------------------
> 3 files changed, 43 insertions(+), 48 deletions(-)
> +static void vm_completions_period(struct work_struct *work);
> +/* Work for aging of vm_completions */
> +static DECLARE_DEFERRED_WORK(vm_completions_period_work, vm_completions_period);
> +
> +static void vm_completions_period(struct work_struct *work)
> +{
> + fprop_new_period(&vm_completions);
> + schedule_delayed_work(&vm_completions_period_work,
> + VM_COMPLETIONS_PERIOD_LEN);
> +}
> +
Is it possible to optimize away the periodic work when there are no
disk writes?
Thanks,
Fengguang
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