Messages in this thread |  | | Date | Wed, 3 Oct 2018 15:51:05 -0700 (PDT) | From | David Rientjes <> | Subject | Re: [RFC PATCH] mm, proc: report PR_SET_THP_DISABLE in proc |
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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.
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