linux-kernel - Re: [RFC][PATCH v2 16/29] mm/show_mem: Annotate static information into Kmemdump

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Message-ID: <72485de0-d05e-4421-9b47-3449778d278b@redhat.com>
Date: Wed, 30 Jul 2025 16:10:07 +0200
From: David Hildenbrand <david@...hat.com>
To: Eugen Hristev <eugen.hristev@...aro.org>, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-mm@...ck.org, tglx@...utronix.de, andersson@...nel.org,
 pmladek@...e.com
Cc: linux-arm-kernel@...ts.infradead.org, linux-hardening@...r.kernel.org,
 corbet@....net, mojha@....qualcomm.com, rostedt@...dmis.org,
 jonechou@...gle.com, tudor.ambarus@...aro.org
Subject: Re: [RFC][PATCH v2 16/29] mm/show_mem: Annotate static information
 into Kmemdump

On 30.07.25 16:04, Eugen Hristev wrote:
> 
> 
> On 7/30/25 16:55, David Hildenbrand wrote:
>> On 24.07.25 15:54, Eugen Hristev wrote:
>>> Annotate vital static information into kmemdump:
>>>    - _totalram_pages
>>>
>>> Information on these variables is stored into dedicated kmemdump section.
>>>
>>> Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
>>> ---
>>>    mm/show_mem.c | 2 ++
>>>    1 file changed, 2 insertions(+)
>>>
>>> diff --git a/mm/show_mem.c b/mm/show_mem.c
>>> index 41999e94a56d..93a5dc041ae1 100644
>>> --- a/mm/show_mem.c
>>> +++ b/mm/show_mem.c
>>> @@ -14,12 +14,14 @@
>>>    #include <linux/mmzone.h>
>>>    #include <linux/swap.h>
>>>    #include <linux/vmstat.h>
>>> +#include <linux/kmemdump.h>
>>>    
>>>    #include "internal.h"
>>>    #include "swap.h"
>>>    
>>>    atomic_long_t _totalram_pages __read_mostly;
>>>    EXPORT_SYMBOL(_totalram_pages);
>>> +KMEMDUMP_VAR_CORE(_totalram_pages, sizeof(_totalram_pages));
>>
>> Tagging these variables that way is really rather ... controversial.
>>
>> As these are exported globals, isn't there a way to have a list of what
>> to include and what not somewhere else?
>>
>> Not sure if any of that would win a beauty price, though.
>>
> 
> Annotating the variable was suggested here :
> 
> https://lore.kernel.org/lkml/87h61wn2qq.ffs@tglx/
> 
> It does not win a beauty prize but it's simple and efficient at least.
> Do you think it would be better to gather all the annotations for the
> globals in a single place ?

See my other mail regarding VMCOREINFO.

-- 
Cheers,

David / dhildenb