linux-kernel - Re: [PATCH v6 13/37] lib: add allocation tagging support for memory allocation profiling

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Message-ID: <acfdf9d8-630b-41d1-9ae0-b3b6442df82c@gmail.com>
Date: Sun, 7 Apr 2024 15:44:03 +0200
From: Klara Modin <klarasmodin@...il.com>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org,
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Subject: Re: [PATCH v6 13/37] lib: add allocation tagging support for memory
 allocation profiling

On 2024-04-06 23:47, Kent Overstreet wrote:
> On Fri, Apr 05, 2024 at 03:54:45PM +0200, Klara Modin wrote:
>> Hi,
>>
>> On 2024-03-21 17:36, Suren Baghdasaryan wrote:
>>> Introduce CONFIG_MEM_ALLOC_PROFILING which provides definitions to easily
>>> instrument memory allocators. It registers an "alloc_tags" codetag type
>>> with /proc/allocinfo interface to output allocation tag information when
>>> the feature is enabled.
>>> CONFIG_MEM_ALLOC_PROFILING_DEBUG is provided for debugging the memory
>>> allocation profiling instrumentation.
>>> Memory allocation profiling can be enabled or disabled at runtime using
>>> /proc/sys/vm/mem_profiling sysctl when CONFIG_MEM_ALLOC_PROFILING_DEBUG=n.
>>> CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT enables memory allocation
>>> profiling by default.
>>>
>>> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
>>> Co-developed-by: Kent Overstreet <kent.overstreet@...ux.dev>
>>> Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
>>
>> With this commit (9e2dcefa791e9d14006b360fba3455510fd3325d in
>> next-20240404), randconfig with KCONFIG_SEED=0xE6264236 fails to build
>> with the attached error. The following patch fixes the build error for me,
>> but I don't know if it's correct.
> 
> Looks good - if you sound out an official patch I'll ack it.
> 

I gave it a try and sent out a patch [1]. This is my first time doing 
that and it's likely not without mistakes.

1. 
https://lore.kernel.org/lkml/20240407133252.173636-1-klarasmodin@gmail.com/T/#u