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SubjectRe: Re: [PATCH v6 04/14] mm/damon: Apply dynamic memory mapping changes
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On Tue, 10 Mar 2020 09:00:26 +0000 Jonathan Cameron <Jonathan.Cameron@Huawei.com> wrote:

> On Mon, 24 Feb 2020 13:30:37 +0100
> SeongJae Park <sjpark@amazon.com> wrote:
>
> > From: SeongJae Park <sjpark@amazon.de>
> >
> > Only a number of parts in the virtual address space of the processes is
> > mapped to physical memory and accessed. Thus, tracking the unmapped
> > address regions is just wasteful. However, tracking every memory
> > mapping change might incur an overhead. For the reason, DAMON applies
> > the dynamic memory mapping changes to the tracking regions only for each
> > of a user-specified time interval (``regions update interval``).
> >
> > Signed-off-by: SeongJae Park <sjpark@amazon.de>
> Trivial inline. Otherwise makes sense to me.
>
[...]
> > +static void damon_apply_three_regions(struct damon_ctx *ctx,
> > + struct damon_task *t, struct region bregions[3])
> > +{
> > + struct damon_region *r, *next;
> > + unsigned int i = 0;
> > +
> > + /* Remove regions which isn't in the three big regions now */
> > + damon_for_each_region_safe(r, next, t) {
> > + for (i = 0; i < 3; i++) {
> > + if (damon_intersect(r, &bregions[i]))
> > + break;
> > + }
> > + if (i == 3)
> > + damon_destroy_region(r);
> > + }
> > +
> > + /* Adjust intersecting regions to fit with the threee big regions */
>
> three

Good eye! Thanks for finding :)

[...]

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