On Wed, 3 Oct 2018, Michal Hocko wrote: > > > So how about this? (not tested yet but it should be pretty > > > straightforward) > > > > Umm, prctl(PR_GET_THP_DISABLE)? > > /me confused. I thought you want to query for the flag on a > _different_ process.
Why would we want to check three locations (system wide setting, prctl setting, madvise setting) to determine if a heap can be backed by thp? If the nh flag being exported to VmFlag is to be extended beyond what my patch did, I suggest (1) it does it for the system wide setting as well and/or (2) calling a helper function to determine if the vma could be backed by thp in the first place regardless of any setting to determine if nh/hg is important. The last thing I suggest is done is adding a third place to check.
