Re: [PATCH v4] mm: introduce reference pages

On Tue, Jun 29, 2021 at 12:19:22AM -0700, John Hubbard wrote:

quoted

+SYSCALL_DEFINE2(refpage_create, const void *__user, content, unsigned long,
+		flags)

From the API discussion (and using a simpler syntax to illustrate this), it
seems like the following would be close:

enum content_type {
	BYTE_PATTERN,
	FOUR_BYTE_PATTERN,
	...
	FULL_4KB_PAGE
};

int refpage_create(const void *__user content, enum content_type, unsigned long flags);

...and if content_type == BYTE_PATTERN, then content is a pointer to just one byte of
data, and so forth for the other enum values.

That seems a little more complicated and non-extensible.

int refpage_create(const void *__user content, unsigned int size,
		unsigned long flags);