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

Klara Modin
2024-04-05T15:38:05Z

On 2024-04-05 17:20, Suren Baghdasaryan wrote:
> On Fri, Apr 5, 2024 at 7:30 AM Klara Modin <klarasmodin@gmail.com> wrote:
>>
>> On 2024-04-05 16:14, Suren Baghdasaryan wrote:
>>> On Fri, Apr 5, 2024 at 6:37 AM Klara Modin <klarasmodin@gmail.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