Re: selftests: bpf: mmap question

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Hi!

On Tue, Jul 28, 2020 at 8:15 AM Andrii Nakryiko
<andrii.nakryiko@xxxxxxxxx> wrote:
>
> On Thu, Jul 23, 2020 at 4:02 AM Yauheni Kaliuta
> <yauheni.kaliuta@xxxxxxxxxx> wrote:
> >
> > Hi!
> >
> > I have a question about the part of the test:
> >
>
> [...]
>
> >
> > In my configuration the first mapping
> >
> >         /* map all but last page: pages 1-3 mapped */
> >         tmp1 = mmap(NULL, 3 * page_size, PROT_READ, MAP_SHARED,
> >                           data_map_fd, 0);
> >
> >
> > maps the area to the 3 pages right before the TLS page.
> > I find it's pretty ok.
>
> Hm... I never ran into this problem. The point here is to be able to
> re-mmap partial ranges. One way would be to re-write all those
> manipulations to start with a full range map, and then do partial
> un-mmaps/re-mmaps, eventually just re-mmaping everything back. I think
> that would work, right, as long as we never unmmap the last page? Do
> you mind trying to fix the test in such a fashion?

Sorry for the delay. I don't sure, sending the patch.




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