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

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Message-Id: <1664447081-14744-1-git-send-email-shradhagupta@linux.microsoft.com>
Date:   Thu, 29 Sep 2022 03:24:39 -0700
From:   Shradha Gupta <shradhagupta@...ux.microsoft.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Shradha Gupta <shradhagupta@...ux.microsoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Shradha Gupta <shradhagupta@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: [PATCH 0/2] Configurable order free page reporting in hyper-v

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(-)

-- 
2.37.2