linux-kernel - Re: [PATCH] proc: export page young and skip_kasan

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Message-ID: <a64d6c6b-ae07-ed49-8185-0381b6e2d37b@linux.alibaba.com>
Date:   Sun, 5 Jun 2022 13:25:00 +0800
From:   Xin Hao <xhao@...ux.alibaba.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     sashal@...nel.org, akpm@...ux-foundation.org, adobriyan@...il.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: export page young and skip_kasan_poison flag via
 kpageflags

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