linux-kernel - [PATCH RFCv1 5/5] hv_balloon:: try to merge "System RAM" resources

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Message-Id: <20200731091838.7490-6-david@redhat.com>
Date:   Fri, 31 Jul 2020 11:18:38 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        linux-hyperv@...r.kernel.org, xen-devel@...ts.xenproject.org,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>
Subject: [PATCH RFCv1 5/5] hv_balloon:: try to merge "System RAM" resources

Let's reuse the new mechanism to merge "System RAM" resources below the
root. We are the only one hotplugging "System RAM" and DIMMs don't apply,
so this is safe to use.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
Cc: Haiyang Zhang <haiyangz@...rosoft.com>
Cc: Stephen Hemminger <sthemmin@...rosoft.com>
Cc: Wei Liu <wei.liu@...nel.org>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 drivers/hv/hv_balloon.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 32e3bc0aa665a..0745f7cc1727b 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -745,6 +745,9 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
 			has->covered_end_pfn -=  processed_pfn;
 			spin_unlock_irqrestore(&dm_device.ha_lock, flags);
 			break;
+		} else {
+			/* Try to reduce the number of "System RAM" resources. */
+			merge_child_mem_resources(&iomem_resource, "System RAM");
 		}
 
 		/*
-- 
2.26.2