Re: [RFC PATCH 0/2] mm/vmstat: Reduce zone lock hold time when reading /proc/pagetypeinfo

[Waiman Long]

On 10/24/19 4:20 AM, Michal Hocko wrote:
> On Wed 23-10-19 12:27:35, Michal Hocko wrote:
> [...]
>> I went with a bound to the pages iteratred over in the free_list. See
>> patch 2.
> I will fold http://lkml.kernel.org/r/20191023180121.GN17610@xxxxxxxxxxxxxx
> to patch 2 unless there are any objections. If there are no further
> comments I will send the two patches without an RFC tomorrow.
>
> Thanks for all the feedback.

I am fine with your change. My concern is to make sure that there is a
reasonable bound to the worst case scenario. With that change, the upper
bound is iterating 100,000 list entries. I think Andrew suggested
lowering it to 1024. That I think may be too low, but I don't mind if it
is lowered somewhat from the current value.

Cheers,
Longman