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

[Davidlohr Bueso <dave@stgolabs.net>]

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.

Thanks,
Davidlohr