On Mon, May 29, 2023 at 7:56 PM Rongwei Wang <rongwei.wang@xxxxxxxxxxxxxxxxx> wrote:
Now vtop can not show us the page is zero pfn
when PTE or PMD has attached ZERO PAGE. This
patch supports show this information directly
when using vtop, likes:
crash> vtop -c 13674 ffff8917e000
VIRTUAL PHYSICAL
ffff8917e000 836e71000
PAGE DIRECTORY: ffff000802f8d000
PGD: ffff000802f8dff8 => 884e29003
PUD: ffff000844e29ff0 => 884e93003
PMD: ffff000844e93240 => 840413003
PTE: ffff000800413bf0 => 160000836e71fc3
PAGE: 836e71000 (ZERO PAGE)
...
If huge page found:
crash> vtop -c 14538 ffff95800000
VIRTUAL PHYSICAL
ffff95800000 910c00000
PAGE DIRECTORY: ffff000801fa0000
PGD: ffff000801fa0ff8 => 884f53003
PUD: ffff000844f53ff0 => 8426cb003
PMD: ffff0008026cb560 => 60000910c00fc1
PAGE: 910c00000 (2MB, ZERO PAGE)
...
That seems be sensible with this patch. And there
are two points have to be noted for 'ZERO PAGE'
label:
1. only supports displaying zero page for THP(except for 1G THP)
2. do not support for the hugetlb cases
Thank you for the update, Rongwei.
I have no other issues. So, for the v4: Ack.
Thanks.
Lianbo
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