[PATCH 0/2] Configurable order free page reporting in hyper-v

Shradha Gupta
2022-09-29T10:25:19Z

Configurable order free page reporting is enabled in page_reporting
driver in mm tree. However, changes need to be made in drivers like
hyper-v's hv_balloon to make it aware of the page order.
These patches add support for the same.
In the page_reporting driver we export the page_reporting_order module
parameter. Following precedence is added in setting the reporting order
a. Value of page_reporting_order parameter
b. Value of order passed while registering with the driver
c. default value (pageblock_order)
Besides this, in the page_reporting module a check is added to ensure
that whenever the page_reporting_order value is changed, it is within
the prescribed limits.

The hv_balloon side changes include consuming the exported
page_reporting_order. Making changes in reporting these variable order
free pages as cold discard hints to hyper-v and dropping and refining
checks that restrict the order to a minimum of 9(default).

Shradha Gupta (2):
mm/page_reporting: Add checks for page_reporting_order param value
hv_balloon: Add support for configurable order free page reporting

drivers/hv/hv_balloon.c | 94 ++++++++++++++++++++++++++++++++---------
mm/page_reporting.c | 50 ++++++++++++++++++++++++++++++++++++++++-----
2 file changed, 118 insertions(+), 26 deletions(-)

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2.37.2