linux-kernel - Re: [PATCH v2] docs: proc.rst: meminfo: briefly describe gaps in memory accounting

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Date:   Tue, 20 Apr 2021 15:21:08 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Jonathan Corbet <corbet@....net>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Michal Hocko <mhocko@...e.com>,
        Mike Rapoport <rppt@...ux.ibm.com>, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] docs: proc.rst: meminfo: briefly describe gaps in
 memory accounting

On Tue, Apr 20, 2021 at 03:13:54PM +0300, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> Add a paragraph that explains that it may happen that the counters in
> /proc/meminfo do not add up to the overall memory usage.
> 
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>

Ooops, forgot to add Michal's Ack, sorry.

> ---
> v2:
> * Add brief changelog
> * Fix typo
> * Update example about network memory usage according to Eric's comment at
> 
> https://lore.kernel.org/lkml/CANn89iKprp7WYeZy4RRO5jHykprnSCcVBc7Tk14Ui_MA9OK7Fg@mail.gmail.com
> 
> v1: Link: https://lore.kernel.org/lkml/20210420085105.1156640-1-rppt@kernel.org
> 
>  Documentation/filesystems/proc.rst | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
> index 48fbfc336ebf..8c77a491c436 100644
> --- a/Documentation/filesystems/proc.rst
> +++ b/Documentation/filesystems/proc.rst
> @@ -929,8 +929,14 @@ meminfo
>  ~~~~~~~
>  
>  Provides information about distribution and utilization of memory.  This
> -varies by architecture and compile options.  The following is from a
> -16GB PIII, which has highmem enabled.  You may not have all of these fields.
> +varies by architecture and compile options. Please note that it may happen
> +that the memory accounted here does not add up to the overall memory usage
> +and the difference for some workloads can be substantial. In many cases there
> +are other means to find out additional memory using subsystem specific
> +interfaces, for instance /proc/net/sockstat for TCP memory allocations.
> +
> +The following is from a 16GB PIII, which has highmem enabled.
> +You may not have all of these fields.
>  
>  ::
>  
> -- 
> 2.29.2
> 

-- 
Sincerely yours,
Mike.