linux-kernel - [PATCH v1 4/5] xen/balloon: try to merge system ram resources

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Message-Id: <20200821103431.13481-5-david@redhat.com>
Date:   Fri, 21 Aug 2020 12:34:30 +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>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Roger Pau Monné <roger.pau@...rix.com>,
        Julien Grall <julien@....org>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Baoquan He <bhe@...hat.com>,
        Wei Yang <richardw.yang@...ux.intel.com>
Subject: [PATCH v1 4/5] xen/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 (e.g., DIMMs don't apply),
so this is safe to be used.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Stefano Stabellini <sstabellini@...nel.org>
Cc: Roger Pau Monné <roger.pau@...rix.com>
Cc: Julien Grall <julien@....org>
Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
Cc: Baoquan He <bhe@...hat.com>
Cc: Wei Yang <richardw.yang@...ux.intel.com>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 drivers/xen/balloon.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 37ffccda8bb87..5ec73f752b8a7 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -338,6 +338,10 @@ static enum bp_state reserve_additional_memory(void)
 	if (rc) {
 		pr_warn("Cannot add additional memory (%i)\n", rc);
 		goto err;
+	} else {
+		resource = NULL;
+		/* Try to reduce the number of system ram resources. */
+		merge_system_ram_resources(&iomem_resource);
 	}
 
 	balloon_stats.total_pages += balloon_hotplug;
-- 
2.26.2