linux-kernel - [PATCH v6 3/6] mm/mempolicy: enable page allocation for MPOL_PREFERRED

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Date:   Mon, 12 Jul 2021 16:09:31 +0800
From:   Feng Tang <feng.tang@...el.com>
To:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Ben Widawsky <ben.widawsky@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andi Kleen <ak@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>, ying.huang@...el.com,
        Feng Tang <feng.tang@...el.com>
Subject: [PATCH v6 3/6] mm/mempolicy: enable page allocation for MPOL_PREFERRED_MANY for general cases

From: Ben Widawsky <ben.widawsky@...el.com>

In order to support MPOL_PREFERRED_MANY which is used by
set_mempolicy(2), mbind(2), enable both alloc_pages() and
alloc_pages_vma() by using alloc_page_preferred_many().

Signed-off-by: Ben Widawsky <ben.widawsky@...el.com>
Signed-off-by: Feng Tang <feng.tang@...el.com>
---
 mm/mempolicy.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index d17bf018efcc..9dce67fc9bb6 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2207,6 +2207,12 @@ struct page *alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
 		goto out;
 	}
 
+	if (pol->mode == MPOL_PREFERRED_MANY) {
+		page = alloc_page_preferred_many(gfp, order, pol);
+		mpol_cond_put(pol);
+		goto out;
+	}
+
 	if (unlikely(IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && hugepage)) {
 		int hpage_node = node;
 
@@ -2286,6 +2292,8 @@ struct page *alloc_pages(gfp_t gfp, unsigned order)
 	 */
 	if (pol->mode == MPOL_INTERLEAVE)
 		page = alloc_page_interleave(gfp, order, interleave_nodes(pol));
+	else if (pol->mode == MPOL_PREFERRED_MANY)
+		page = alloc_page_preferred_many(gfp, order, pol);
 	else
 		page = __alloc_pages(gfp, order,
 				policy_node(gfp, pol, numa_node_id()),
-- 
2.7.4