Re: [PATCH 1/3] lockdep: Apply crossrelease to PG_locked locks

[Byungchul Park]

On 11/16/2017 9:02 PM, Michal Hocko wrote:
> for each struct page. So you are doubling the size. Who is going to
> enable this config option? You are moving this to page_ext in a later
> patch which is a good step but it doesn't go far enough because this
> still consumes those resources. Is there any problem to make this
> kernel command line controllable? Something we do for page_owner for
> example?

Sure. I will add it.

> Also it would be really great if you could give us some measures about
> the runtime overhead. I do not expect it to be very large but this is

The major overhead would come from the amount of additional memory
consumption for 'lockdep_map's.

Do you want me to measure the overhead by the additional memory
consumption?

Or do you expect another overhead?

Could you tell me what kind of result you want to get?

> something people are usually interested in when enabling debugging
> features.

--
Thanks,
Byungchul