On Wed, 26 Sep 2012, David Rientjes wrote:

On Wed, 19 Sep 2012, Hugh Dickins wrote:

quoted

Good catch, and the patch looks right to me, as far as it goes:
but does it go far enough?

I hesitate because it looks as if the NR_MLOCK zone page state is
maintained (with incs and decs) in ignorance of THP; so although
you will be correcting the Unevictable kB with your mlock_vma_page(),
the Mlocked kB just above it in /proc/meminfo would still be wrong?

Indeed, NR_MLOCK is a separate problem with regard to thp and it's 
currently incremented once for every hugepage rather than HPAGE_PMD_NR.  
mlock_vma_page() needs to increment by hpage_nr_pages(page) like 
add_page_to_lru_list() does.

quoted

I suppose I'm not sure whether this is material for late-3.6:
surely it's not a fix for a recent regression?

Ok, sounds good.  If there's no objection, I'd like to ask Andrew to apply 
this to -mm and remove the cc to stable@vger.kernel.org since the 
mlock_vma_page() problem above is separate and doesn't conflict with this 
code, so I'll send a followup patch to address that.

Thanks!

Sounds right, certainly no objection from me, thanks for taking care of it.

Hugh

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