[PATCH 2/4] mm: speed up mremap by 500x on large regions (v2)
joel at joelfernandes.org
Wed Oct 24 19:13:50 PDT 2018
On Wed, Oct 24, 2018 at 10:57:33PM +1100, Balbir Singh wrote:
> > > + pmd_t pmd;
> > > +
> > > + new_ptl = pmd_lockptr(mm, new_pmd);
> Looks like this is largely inspired by move_huge_pmd(), I guess a lot of
> the code applies, why not just reuse as much as possible? The same comments
> w.r.t mmap_sem helping protect against lock order issues applies as well.
I thought about this and when I looked into it, it seemed there are subtle
differences that make such sharing not worth it (or not possible).
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