[031/166] mm/page_reporting: add free page reporting documentation

Commit Message

Andrew Morton April 7, 2020, 3:05 a.m. UTC

From: Alexander Duyck <[e-mail]>
Subject: mm/page_reporting: add free page reporting documentation

Add documentation for free page reporting.  Currently the only consumer is
virtio-balloon, however it is possible that other drivers might make use
of this so it is best to add a bit of documetation explaining at a high
level how to use the API.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Alexander Duyck <[e-mail]>
Cc: Andrea Arcangeli <[e-mail]>
Cc: Dan Williams <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: David Hildenbrand <[e-mail]>
Cc: Konrad Rzeszutek Wilk <[e-mail]>
Cc: Luiz Capitulino <[e-mail]>
Cc: Matthew Wilcox <[e-mail]>
Cc: Mel Gorman <[e-mail]>
Cc: Michael S. Tsirkin <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: Nitesh Narayan Lal <[e-mail]>
Cc: Oscar Salvador <[e-mail]>
Cc: Pankaj Gupta <[e-mail]>
Cc: Paolo Bonzini <[e-mail]>
Cc: Rik van Riel <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Cc: Wei Wang <[e-mail]>
Cc: Yang Zhang <[e-mail]>
Cc: wei qi <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 Documentation/vm/free_page_reporting.rst |   41 +++++++++++++++++++++
 1 file changed, 41 insertions(+)

Patch

--- /dev/null
+++ a/Documentation/vm/free_page_reporting.rst
@@ -0,0 +1,41 @@ 
+.. _free_page_reporting:
+
+=====================
+Free Page Reporting
+=====================
+
+Free page reporting is an API by which a device can register to receive
+lists of pages that are currently unused by the system. This is useful in
+the case of virtualization where a guest is then able to use this data to
+notify the hypervisor that it is no longer using certain pages in memory.
+
+For the driver, typically a balloon driver, to use of this functionality
+it will allocate and initialize a page_reporting_dev_info structure. The
+field within the structure it will populate is the "report" function
+pointer used to process the scatterlist. It must also guarantee that it can
+handle at least PAGE_REPORTING_CAPACITY worth of scatterlist entries per
+call to the function. A call to page_reporting_register will register the
+page reporting interface with the reporting framework assuming no other
+page reporting devices are already registered.
+
+Once registered the page reporting API will begin reporting batches of
+pages to the driver. The API will start reporting pages 2 seconds after
+the interface is registered and will continue to do so 2 seconds after any
+page of a sufficiently high order is freed.
+
+Pages reported will be stored in the scatterlist passed to the reporting
+function with the final entry having the end bit set in entry nent - 1.
+While pages are being processed by the report function they will not be
+accessible to the allocator. Once the report function has been completed
+the pages will be returned to the free area from which they were obtained.
+
+Prior to removing a driver that is making use of free page reporting it
+is necessary to call page_reporting_unregister to have the
+page_reporting_dev_info structure that is currently in use by free page
+reporting removed. Doing this will prevent further reports from being
+issued via the interface. If another driver or the same driver is
+registered it is possible for it to resume where the previous driver had
+left off in terms of reporting free pages.
+
+Alexander Duyck, Dec 04, 2019
+