[PATCH 2/4] mm: speed up mremap by 500x on large regions (v2)
bsingharora at gmail.com
Sat Oct 27 03:21:02 PDT 2018
On Wed, Oct 24, 2018 at 07:13:50PM -0700, Joel Fernandes wrote:
> 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).
Could you elaborate on them?
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