Re: [Crash-utility] [PATCH v4] arm64/x86_64: show zero pfn information when using vtop
On 2023/05/29 22:13, lijiang wrote:
On Mon, May 29, 2023 at 7:56 PM Rongwei Wang
<rongwei.wang(a)linux.alibaba.com>
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.
Thank you. After all, changed the commit log and applied:
https://github.com/crash-utility/crash/commit/a0eceb041dfa248d66f9f9a4551...
Thanks,
Kazu