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<div class="moz-cite-prefix">On 2/11/2022 10:39 AM, David
Hildenbrand wrote:<br>
</div>
<blockquote type="cite" cite="mid:f2af73c1-396b-168f-7f86-eb10b3b68a26@redhat.com">
<pre class="moz-quote-pre" wrap="">On 11.02.22 17:15, David Hildenbrand wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">On 01.02.22 16:48, Alex Sierra wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Device memory that is cache coherent from device and CPU point of view.
This is used on platforms that have an advanced system bus (like CAPI
or CXL). Any page of a process can be migrated to such memory. However,
no one should be allowed to pin such memory so that it can always be
evicted.
Signed-off-by: Alex Sierra <a class="moz-txt-link-rfc2396E" href="mailto:alex.sierra@amd.com"><alex.sierra@amd.com></a>
Acked-by: Felix Kuehling <a class="moz-txt-link-rfc2396E" href="mailto:Felix.Kuehling@amd.com"><Felix.Kuehling@amd.com></a>
Reviewed-by: Alistair Popple <a class="moz-txt-link-rfc2396E" href="mailto:apopple@nvidia.com"><apopple@nvidia.com></a>
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">
So, I'm currently messing with PageAnon() pages and CoW semantics ...
all these PageAnon() ZONE_DEVICE variants don't necessarily make my life
easier but I'm not sure yet if they make my life harder. I hope you can
help me understand some of that stuff.
1) What are expected CoW semantics for DEVICE_COHERENT?
I assume we'll share them just like other PageAnon() pages during fork()
readable, and the first sharer writing to them receives an "ordinary"
!ZONE_DEVICE copy.
So this would be just like DEVICE_EXCLUSIVE CoW handling I assume, just
that we don't have to go through the loop of restoring a device
exclusive entry?
2) How are these pages freed to clear/invalidate PageAnon() ?
I assume for PageAnon() ZONE_DEVICE pages we'll always for via
free_devmap_managed_page(), correct?
3) FOLL_PIN
While you write "no one should be allowed to pin such memory", patch #2
only blocks FOLL_LONGTERM. So I assume we allow ordinary FOLL_PIN and
you might want to be a bit more precise?</pre>
</blockquote>
</blockquote>
<p class="MsoPlainText">Device coherent pages can be FOLL_PIN.
However, we
want to avoid FOLL_LONGTERM with<br>
these pages because that would affect our memory manager's
ability to evict device memory.</p>
<p class="MsoPlainText">Regards,<br>
Alex Sierra<br>
</p>
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<blockquote type="cite" cite="mid:f2af73c1-396b-168f-7f86-eb10b3b68a26@redhat.com">
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">
... I'm pretty sure we cannot FOLL_PIN DEVICE_PRIVATE pages, but can we
FILL_PIN DEVICE_EXCLUSIVE pages? I strongly assume so?
Thanks for any information.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">
(digging a bit more, I realized that device exclusive pages are not
actually/necessarily ZONE_DEVICE pages -- so I assume DEVICE_COHERENT
will be the actual first PageAnon() ZONE_DEVICE pages that can be
present in a page table.)</pre>
</blockquote>
<p>Yes, that's correct. Device coherent pages are pte present.</p>
<p>Regards,<br>
Alex Sierra<br>
</p>
<blockquote type="cite" cite="mid:f2af73c1-396b-168f-7f86-eb10b3b68a26@redhat.com">
<pre class="moz-quote-pre" wrap="">
</pre>
</blockquote>
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