linux-kernel - [PATCH v4 7/7] drivers: hyperv: balloon

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Message-Id: <20221005090158.2801592-8-alexander.atanasov@virtuozzo.com>
Date:   Wed,  5 Oct 2022 12:01:57 +0300
From:   Alexander Atanasov <alexander.atanasov@...tuozzo.com>
To:     "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>
Cc:     kernel@...nvz.org,
        Alexander Atanasov <alexander.atanasov@...tuozzo.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 7/7] drivers: hyperv: balloon - report inflated memory

Propagate inflated memory changes to mm.

Signed-off-by: Alexander Atanasov <alexander.atanasov@...tuozzo.com>
---
 drivers/hv/hv_balloon.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index fdf6decacf06..b4c828c462a4 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -24,6 +24,7 @@
 #include <linux/notifier.h>
 #include <linux/percpu_counter.h>
 #include <linux/page_reporting.h>
+#include <linux/balloon.h>
 
 #include <linux/hyperv.h>
 #include <asm/hyperv-tlfs.h>
@@ -1280,6 +1281,13 @@ static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
 	return i * alloc_unit;
 }
 
+static void report_ballooned_pages(struct hv_dynmem_device *dm)
+{
+	u32 actual = dm->num_pages_ballooned;
+	long inflated_kb = actual << (HV_HYP_PAGE_SHIFT - 10);
+
+	balloon_set_inflated_total(inflated_kb);
+}
+
 static void balloon_up(struct work_struct *dummy)
 {
 	unsigned int num_pages = dm_device.balloon_wrk.num_pages;
@@ -1368,6 +1376,7 @@ static void balloon_up(struct work_struct *dummy)
 		}
 	}
 
+	report_ballooned_pages(&dm_device);
 }
 
 static void balloon_down(struct hv_dynmem_device *dm,
@@ -1387,6 +1396,8 @@ static void balloon_down(struct hv_dynmem_device *dm,
 	pr_debug("Freed %u ballooned pages.\n",
 		prev_pages_ballooned - dm->num_pages_ballooned);
 
+	report_ballooned_pages(dm);
+
 	if (req->more_pages == 1)
 		return;
 
-- 
2.31.1