Re: [PATCH] proc: export page young and skip_kasan_poison flag via kpageflags

From: Xin Hao
Date: Sun Jun 05 2022 - 01:43:20 EST


Hi, Matthew:

On 6/4/22 11:08 PM, Matthew Wilcox wrote:
On Sat, Jun 04, 2022 at 05:50:31PM +0800, Xin Hao wrote:
On 6/3/22 2:28 AM, Matthew Wilcox wrote:
On Thu, Jun 02, 2022 at 11:43:02PM +0800, Xin Hao wrote:
Now the young and skip_kasan_poison flag are supported in
Why do we want userspace to know about whether skip_kasan_poison is set?
That seems like a kernel-internal detail to me.
the  skip_kasan_poison also a page flags, we use page_types tool to display
them not only include user-internal,

but also  kernel-internal, add them, the page-types tool can more detail
display the kernel-internal page flags,

just in case we don't miss some page flags when check the whole memory.
So you're just being completist? You don't have a reason to expose this
information?

Yes, about the skip_kasan_poison, i just want the kpageflags to support it,  i think it should be included,

the mainly  region is i want get the page node info from the kpageflags in my next patch,  when i check these

codes,  i see there lost some info about the skip_kasan_poison and young flags,  the page_types tool also check

the kasan pages, so i think it should be included.

Thanks.

--
Best Regards!
Xin Hao