From: Liang Li <liang.z.li@intel.com>
To: linux-kernel@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org, linux-mm@kvack.org,
virtio-dev@lists.oasis-open.org, kvm@vger.kernel.org,
qemu-devel@nongnu.org, dgilbert@redhat.com, quintela@redhat.com,
Liang Li <liang.z.li@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
Mel Gorman <mgorman@techsingularity.net>,
"Michael S. Tsirkin" <mst@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Amit Shah <amit.shah@redhat.com>
Subject: [PATCH v2 repost 6/7] mm: add the related functions to get free page info
Date: Wed, 27 Jul 2016 09:23:35 +0800 [thread overview]
Message-ID: <1469582616-5729-7-git-send-email-liang.z.li@intel.com> (raw)
In-Reply-To: <1469582616-5729-1-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: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
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 | 46 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7da61ad..3ad8b10 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4523,6 +4523,52 @@ unsigned long get_max_pfn(void)
}
EXPORT_SYMBOL(get_max_pfn);
+static void mark_free_pages_bitmap(struct zone *zone, unsigned long start_pfn,
+ unsigned long end_pfn, unsigned long *bitmap, unsigned long len)
+{
+ unsigned long pfn, flags, page_num;
+ unsigned int order, t;
+ struct list_head *curr;
+
+ if (zone_is_empty(zone))
+ return;
+ end_pfn = min(start_pfn + len, end_pfn);
+ spin_lock_irqsave(&zone->lock, flags);
+
+ 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));
+ if (pfn >= start_pfn && pfn <= end_pfn) {
+ page_num = 1UL << order;
+ if (pfn + page_num > end_pfn)
+ page_num = end_pfn - pfn;
+ bitmap_set(bitmap, pfn - start_pfn, page_num);
+ }
+ }
+ }
+
+ spin_unlock_irqrestore(&zone->lock, flags);
+}
+
+int get_free_pages(unsigned long start_pfn, unsigned long end_pfn,
+ unsigned long *bitmap, unsigned long len)
+{
+ struct zone *zone;
+ int ret = 0;
+
+ if (bitmap == NULL || start_pfn > end_pfn || start_pfn >= max_pfn)
+ return 0;
+ if (end_pfn < max_pfn)
+ ret = 1;
+ if (end_pfn >= max_pfn)
+ ret = 0;
+
+ for_each_populated_zone(zone)
+ mark_free_pages_bitmap(zone, start_pfn, end_pfn, bitmap, len);
+ return ret;
+}
+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:[~2016-07-27 1:32 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-27 1:23 [PATCH v2 repost 0/7] Extend virtio-balloon for fast (de)inflating & fast live migration Liang Li
2016-07-27 1:23 ` [PATCH v2 repost 1/7] virtio-balloon: rework deflate to add page to a list Liang Li
2016-07-27 1:23 ` [PATCH v2 repost 2/7] virtio-balloon: define new feature bit and page bitmap head Liang Li
2016-07-27 1:23 ` [PATCH v2 repost 3/7] mm: add a function to get the max pfn Liang Li
2016-07-27 22:08 ` Michael S. Tsirkin
2016-07-27 22:52 ` Dave Hansen
2016-07-27 1:23 ` [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process Liang Li
2016-07-27 16:03 ` Dave Hansen
2016-07-27 21:39 ` Michael S. Tsirkin
2016-07-28 3:30 ` Li, Liang Z
2016-07-28 22:15 ` Michael S. Tsirkin
2016-07-29 1:08 ` [virtio-dev] " Li, Liang Z
2016-07-28 1:13 ` Li, Liang Z
2016-07-28 1:45 ` Michael S. Tsirkin
2016-07-28 6:36 ` [virtio-dev] " Li, Liang Z
2016-07-28 21:51 ` Michael S. Tsirkin
2016-07-29 0:46 ` Li, Liang Z
2016-07-29 19:48 ` Dave Hansen
2016-08-02 0:28 ` Li, Liang Z
2016-07-27 21:36 ` Michael S. Tsirkin
2016-07-28 3:06 ` Li, Liang Z
2016-07-28 22:17 ` Michael S. Tsirkin
2016-07-29 0:38 ` Li, Liang Z
2016-07-27 22:07 ` Michael S. Tsirkin
2016-07-28 3:48 ` Li, Liang Z
2016-07-27 1:23 ` [PATCH v2 repost 5/7] virtio-balloon: define feature bit and head for misc virt queue Liang Li
2016-07-27 1:23 ` Liang Li [this message]
2016-07-27 16:40 ` [PATCH v2 repost 6/7] mm: add the related functions to get free page info Dave Hansen
2016-07-27 22:05 ` Michael S. Tsirkin
2016-07-27 22:16 ` Dave Hansen
2016-07-27 23:05 ` Michael S. Tsirkin
2016-07-28 4:36 ` Li, Liang Z
2016-07-28 0:10 ` Li, Liang Z
2016-07-28 0:17 ` Michael S. Tsirkin
2016-07-27 22:13 ` Michael S. Tsirkin
2016-07-28 5:30 ` [virtio-dev] " Li, Liang Z
2016-07-27 1:23 ` [PATCH v2 repost 7/7] virtio-balloon: tell host vm's " Liang Li
2016-07-27 22:00 ` Michael S. Tsirkin
2016-07-28 7:50 ` Li, Liang Z
2016-07-28 21:37 ` Michael S. Tsirkin
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