linux-kernel - Re: [PATCH v6 00/37] Memory allocation profiling

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Date: Fri, 5 Apr 2024 17:37:59 +0200
From: Klara Modin <klarasmodin@...il.com>
To: Suren Baghdasaryan <surenb@...gle.com>
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Subject: Re: [PATCH v6 00/37] Memory allocation profiling



On 2024-04-05 17:20, Suren Baghdasaryan wrote:
> On Fri, Apr 5, 2024 at 7:30 AM Klara Modin <klarasmodin@...il.com> wrote:
>>
>> On 2024-04-05 16:14, Suren Baghdasaryan wrote:
>>> On Fri, Apr 5, 2024 at 6:37 AM Klara Modin <klarasmodin@...il.com> wrote:
>>>> If I enable this, I consistently get percpu allocation failures. I can
>>>> occasionally reproduce it in qemu. I've attached the logs and my config,
>>>> please let me know if there's anything else that could be relevant.
>>>
>>> Thanks for the report!
>>> In debug_alloc_profiling.log I see:
>>>
>>> [    7.445127] percpu: limit reached, disable warning
>>>
>>> That's probably the reason. I'll take a closer look at the cause of
>>> that and how we can fix it.
>>
>> Thanks!
> 
> In the build that produced debug_alloc_profiling.log I think we are
> consuming all the per-cpu memory reserved for the modules. Could you
> please try this change and see if that fixes the issue:
> 
>   include/linux/percpu.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/percpu.h b/include/linux/percpu.h
> index a790afba9386..03053de557cf 100644
> --- a/include/linux/percpu.h
> +++ b/include/linux/percpu.h
> @@ -17,7 +17,7 @@
>   /* enough to cover all DEFINE_PER_CPUs in modules */
>   #ifdef CONFIG_MODULES
>   #ifdef CONFIG_MEM_ALLOC_PROFILING
> -#define PERCPU_MODULE_RESERVE (8 << 12)
> +#define PERCPU_MODULE_RESERVE (8 << 13)
>   #else
>   #define PERCPU_MODULE_RESERVE (8 << 10)
>   #endif
> 

Yeah, that patch fixes the issue for me.

Thanks,
Tested-by: Klara Modin