linux-kernel - [PATCH v4 7/8] xen/balloon: try to merge system ram resources

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Message-Id: <20200911103459.10306-8-david@redhat.com>
Date:   Fri, 11 Sep 2020 12:34:58 +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,
        linux-acpi@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-s390@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Andrew Morton <akpmt@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.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 v4 7/8] xen/balloon: try to merge system ram resources

Let's try to merge system ram resources we add, to minimize the number
of resources in /proc/iomem. We don't care about the boundaries of
individual chunks we added.

Reviewed-by: Juergen Gross <jgross@...e.com>
Cc: Andrew Morton <akpmt@...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 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 9f40a294d398d..b57b2067ecbfb 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -331,7 +331,7 @@ static enum bp_state reserve_additional_memory(void)
 	mutex_unlock(&balloon_mutex);
 	/* add_memory_resource() requires the device_hotplug lock */
 	lock_device_hotplug();
-	rc = add_memory_resource(nid, resource, MHP_NONE);
+	rc = add_memory_resource(nid, resource, MEMHP_MERGE_RESOURCE);
 	unlock_device_hotplug();
 	mutex_lock(&balloon_mutex);
 
-- 
2.26.2