From: Liang Li <liang.z.li@intel.com>
To: kvm@vger.kernel.org
Cc: virtio-dev@lists.oasis-open.org, qemu-devel@nongun.org,
linux-kernel@vger.kernel.org, mst@redhat.com,
Liang Li <liang.z.li@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Amit Shah <amit.shah@redhat.com>
Subject: [PATCH 5/6] mm: add the related functions to get free page info
Date: Mon, 13 Jun 2016 17:47:12 +0800 [thread overview]
Message-ID: <1465811233-21136-6-git-send-email-liang.z.li@intel.com> (raw)
In-Reply-To: <1465811233-21136-1-git-send-email-liang.z.li@intel.com>
Save the free page info into a page bitmap, will be used in virtio
balloon device driver.
Signed-off-by: Liang Li <liang.z.li@intel.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Amit Shah <amit.shah@redhat.com>
---
mm/page_alloc.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6903b69..96b408f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4515,6 +4515,46 @@ void show_free_areas(unsigned int filter)
show_swap_cache_info();
}
+unsigned long get_max_pfn(void)
+{
+ return max_pfn;
+}
+EXPORT_SYMBOL(get_max_pfn);
+
+static void mark_free_pages_bitmap(struct zone *zone,
+ unsigned long *bitmap, unsigned long len)
+{
+ unsigned long pfn, flags, limit, page_num;
+ unsigned int order, t;
+ struct list_head *curr;
+
+ if (zone_is_empty(zone))
+ return;
+
+ spin_lock_irqsave(&zone->lock, flags);
+
+ limit = min(len, max_pfn);
+ for_each_migratetype_order(order, t) {
+ list_for_each(curr, &zone->free_area[order].free_list[t]) {
+ pfn = page_to_pfn(list_entry(curr, struct page, lru));
+ page_num = 1UL << order;
+ if (pfn + page_num < limit)
+ bitmap_set(bitmap, pfn, page_num);
+ }
+ }
+
+ spin_unlock_irqrestore(&zone->lock, flags);
+}
+
+void get_free_pages(unsigned long *bitmap, unsigned long len)
+{
+ struct zone *zone;
+
+ for_each_populated_zone(zone)
+ mark_free_pages_bitmap(zone, bitmap, len);
+}
+EXPORT_SYMBOL(get_free_pages);
+
static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref)
{
zoneref->zone = zone;
--
1.9.1
next prev parent reply other threads:[~2016-06-13 9:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-13 9:47 [PATCH 0/6] Fast balloon & fast live migration Liang Li
2016-06-13 9:47 ` [PATCH 1/6] virtio-balloon: rework deflate to add page to a list Liang Li
2016-06-23 8:25 ` Li, Liang Z
2016-06-23 8:30 ` Li, Liang Z
2016-06-13 9:47 ` [PATCH 2/6] virtio-balloon: speed up inflate/deflate process Liang Li
2016-06-13 10:17 ` kbuild test robot
2016-06-24 5:39 ` Michael S. Tsirkin
2016-06-24 6:28 ` Li, Liang Z
2016-06-13 9:47 ` [PATCH 3/6] mm:split the drop cache operation into a function Liang Li
2016-06-13 9:47 ` [PATCH 4/6] virtio-balloon: add drop cache support Liang Li
2016-06-13 9:47 ` Liang Li [this message]
2016-06-13 9:47 ` [PATCH 6/6] virtio-balloon: tell host vm's free page info Liang Li
2016-06-23 8:27 ` [PATCH 0/6] Fast balloon & fast live migration Li, Liang Z
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