Re: [PATCH 2/3] mm/util.c: make vm_memory_committed() more accurate

[Feng Tang]

On Fri, May 15, 2020 at 05:04:40PM +0800, Michal Hocko wrote:
> On Fri 15-05-20 16:11:09, Feng Tang wrote:
> > On Fri, May 15, 2020 at 03:23:07PM +0800, Michal Hocko wrote:
> > > On Fri 08-05-20 15:25:16, Feng Tang wrote:
> > > > percpu_counter_sum_positive() will provide more accurate info.
> > > 
> > > Why do we need that?
> > 
> > This is a preparation for patch 3/3, which will enlarge the batch size
> > of percpu-counter 'vm_committed_as'. Andi Kleen concerned that may
> > hurt the accuracy for those readers (currently only /proc/meminfo
> > and hyperV balloon drivers for status check)
> > 
> > As in worst case, the deviation could be 'batch * nr_cpus', and
> > with patch 3/3, that could be totalram_pages/16.
> 
> This information belongs to the changelog.

Will add it in v3, thanks

- Feng