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

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Date: Sun, 7 Apr 2024 18:50:51 +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 2024-04-07 15:44, Klara Modin wrote:
> 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

linux/smp.h may be needed as well. I tried cross-compiling the 
randconfig for riscv which complains of missing raw_smp_processor_id() 
and including linux/smp.h resolves that.

Does this look reasonable, and if so, should I send it as well?

diff --git a/include/linux/alloc_tag.h b/include/linux/alloc_tag.h
index afc9e259a2d3..7fe1cbdab0b0 100644
--- a/include/linux/alloc_tag.h
+++ b/include/linux/alloc_tag.h
@@ -13,6 +13,7 @@
  #include <linux/cpumask.h>
  #include <linux/static_key.h>
  #include <linux/irqflags.h>
+#include <linux/smp.h>

  struct alloc_tag_counters {
         u64 bytes;

Download attachment "randconfig-riscv.gz" of type "application/gzip" (42191 bytes)

View attachment "riscv-alloc_tag-error" of type "text/plain" (3328 bytes)