Re: [PATCH v8 3/8] mm: Hot page tracking and promotion - pghot

[Bharata B Rao]

On 28-Sep-26 4:55 AM, Davidlohr Bueso wrote:
> On Tue, 28 Jul 2026, Bharata B Rao wrote:
> 
>> +/**
>> + * pghot_record_access() - Record page accesses from lower tier memory
>> + * for the purpose of tracking page hotness and subsequent promotion.
>> + *
>> + * @pfn: PFN of the page
>> + * @nid: Unused
>> + * @src: The identifier of the sub-system that reports the access
>> + * @now: Access time in jiffies
>> + *
>> + * Updates the frequency and time of access and marks the page as
>> + * ready for migration if the frequency crosses a threshold. The pages
>> + * marked for migration are migrated by kmigrated kernel thread.
>> + *
>> + * Return: 0 on success and -EINVAL on failure to record the access.
>> + */
>> +int pghot_record_access(unsigned long pfn, int nid, int src, unsigned long now)
>> +{
> [...]
>> +}
> 
> This needs a EXPORT_SYMBOL_GPL(pghot_record_access) for any module based
> sources.

Ah I didn't see that till now. CXL driver would need that. Thanks will add.

Regards,
Bharata.