linux-kernel - [RFC PATCH v3 21/31] page_alloc: use dnuma to transplant newly freed pages in free_hot_cold

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Message-Id: <1367539263-19999-22-git-send-email-cody@linux.vnet.ibm.com>
Date:	Thu,  2 May 2013 17:00:53 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Linux MM <linux-mm@...ck.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Simon Jeons <simon.jeons@...il.com>
Subject: [RFC PATCH v3 21/31] page_alloc: use dnuma to transplant newly freed pages in free_hot_cold_page()

free_hot_cold_page() is used for order == 0 pages, and is where the
page's zone is decided.

In the normal case, these pages are freed to the per-cpu lists. When a
page needs transplanting (ie: the actual node it belongs to has changed,
and it needs to be moved to another zone), the pcp lists are skipped &
the page is freed via free_one_page().

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 mm/page_alloc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f33f1bf..38a2161 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1358,6 +1358,7 @@ void mark_free_pages(struct zone *zone)
  */
 void free_hot_cold_page(struct page *page, int cold)
 {
+	int dest_nid;
 	struct zone *zone = page_zone(page);
 	struct per_cpu_pages *pcp;
 	unsigned long flags;
@@ -1371,6 +1372,15 @@ void free_hot_cold_page(struct page *page, int cold)
 	local_irq_save(flags);
 	__count_vm_event(PGFREE);
 
+	dest_nid = dnuma_page_needs_move(page);
+	if (dest_nid != NUMA_NO_NODE) {
+		struct zone *dest_zone = nid_zone(dest_nid, page_zonenum(page));
+		dnuma_prior_free_to_new_zone(page, 0, dest_zone, dest_nid);
+		free_one_page(dest_zone, page, 0, migratetype);
+		dnuma_post_free_to_new_zone(0);
+		goto out;
+	}
+
 	/*
 	 * We only track unmovable, reclaimable and movable on pcp lists.
 	 * Free ISOLATE pages back to the allocator because they are being
-- 
1.8.2.2

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