linux-kernel - Re: [PATCH 1/1] fixup: alloc_tag: mark inaccurate allocation counters in /proc/allocinfo output

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <4e76b94d-9c32-4ec1-b2ec-fc989f1a23ad@infradead.org>
Date: Thu, 18 Sep 2025 21:20:58 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
 Usama Arif <usamaarif642@...il.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>, kent.overstreet@...ux.dev,
 vbabka@...e.cz, hannes@...xchg.org, rientjes@...gle.com,
 roman.gushchin@...ux.dev, harry.yoo@...cle.com, shakeel.butt@...ux.dev,
 00107082@....com, pyyjason@...il.com, pasha.tatashin@...een.com,
 souravpanda@...gle.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] fixup: alloc_tag: mark inaccurate allocation counters
 in /proc/allocinfo output

Andrew,

On 9/16/25 5:56 PM, Andrew Morton wrote:
> On Tue, 16 Sep 2025 21:50:51 +0100 Usama Arif <usamaarif642@...il.com> wrote:
> 
>>
>>
>> On 16/09/2025 17:01, Suren Baghdasaryan wrote:
>>> Document new "accurate:no" marker.
>>>
>>> Fixes: 39d117e04d15 ("alloc_tag: mark inaccurate allocation counters in /proc/allocinfo output")
>>> Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
>>> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
>>> ---
>>> Based on mm-new
>>>
>>>  Documentation/filesystems/proc.rst | 8 ++++++++
>>>  1 file changed, 8 insertions(+)
>>>
>>> diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
>>> index 1776a06571c2..17668f82ff1c 100644
>>> --- a/Documentation/filesystems/proc.rst
>>> +++ b/Documentation/filesystems/proc.rst
>>> @@ -1014,6 +1014,14 @@ If file version is 2.0 or higher then each line may contain additional
>>>  For example if the counters are not accurate, the line will be appended with
>>>  "accurate:no" pair.
>>>  
>>> +Supported markers in v2:
>>> +accurate:no
>>> +              Absolute values of the counters in this line are not
>>
>> s/values/value/ maybe? :)
> 
> That's OK as-is.
> 
>> +              accurate because of the failure to allocate storage required
>>
>> s/storage required/memory/
> 
> Sure.
> 
> 
> From: Andrew Morton <akpm@...ux-foundation.org>
> Subject: alloc_tag-mark-inaccurate-allocation-counters-in-proc-allocinfo-output-fix-fix
> Date: Tue Sep 16 05:53:33 PM PDT 2025
> 
> simplification per Usama, reflow text
> 
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: David Wang <00107082@....com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Kent Overstreet <kent.overstreet@...ux.dev>
> Cc: Pasha Tatashin <pasha.tatashin@...een.com>
> Cc: Roman Gushchin <roman.gushchin@...ux.dev>
> Cc: Shakeel Butt <shakeel.butt@...ux.dev>
> Cc: Sourav Panda <souravpanda@...gle.com>
> Cc: Suren Baghdasaryan <surenb@...gle.com>
> Cc: Usama Arif <usamaarif642@...il.com>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> 
>  Documentation/filesystems/proc.rst |   10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> --- a/Documentation/filesystems/proc.rst~alloc_tag-mark-inaccurate-allocation-counters-in-proc-allocinfo-output-fix-fix
> +++ a/Documentation/filesystems/proc.rst
> @@ -1016,11 +1016,11 @@ For example if the counters are not accu
>  
>  Supported markers in v2:
>  accurate:no

Please insert a blank line here to prevent a docs warning:

linux-next-20250918/Documentation/filesystems/proc.rst:998: ERROR: Unexpected indentation. [docutils]

Thanks.

> -              Absolute values of the counters in this line are not
> -              accurate because of the failure to allocate storage required
> -              to track some of the allocations made at this location.
> -              Deltas in these counters are accurate, therefore counters
> -              can be used to track allocation size and count changes.
> +              Absolute values of the counters in this line are not accurate
> +              because of the failure to allocate memory to track some of the
> +              allocations made at this location.  Deltas in these counters are
> +              accurate, therefore counters can be used to track allocation size
> +              and count changes.
>  
>  Example output.
>  
> _

-- 
~Randy