linux-kernel - [PATCH 09/12] mm/mempolicy: Thread allocation for many preferred

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Date:   Fri, 30 Oct 2020 12:02:35 -0700
From:   Ben Widawsky <ben.widawsky@...el.com>
To:     linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Ben Widawsky <ben.widawsky@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Michal Hocko <mhocko@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 09/12] mm/mempolicy: Thread allocation for many preferred

In order to support MPOL_PREFERRED_MANY as the mode used by
set_mempolicy(2), alloc_pages_current() needs to support it. This patch
does that by using the new helper function to allocate properly based on
policy.

All the actual machinery to make this work was part of
("mm/mempolicy: Create a page allocator for policy")

Link: https://lore.kernel.org/r/20200630212517.308045-10-ben.widawsky@intel.com
Signed-off-by: Ben Widawsky <ben.widawsky@...el.com>
---
 mm/mempolicy.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 1fd0da0f9631..2d19235413db 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2343,7 +2343,7 @@ EXPORT_SYMBOL(alloc_pages_vma);
 struct page *alloc_pages_current(gfp_t gfp, unsigned order)
 {
 	struct mempolicy *pol = &default_policy;
-	struct page *page;
+	int nid = NUMA_NO_NODE;
 
 	if (!in_interrupt() && !(gfp & __GFP_THISNODE))
 		pol = get_task_policy(current);
@@ -2353,14 +2353,9 @@ struct page *alloc_pages_current(gfp_t gfp, unsigned order)
 	 * nor system default_policy
 	 */
 	if (pol->mode == MPOL_INTERLEAVE)
-		page = alloc_pages_policy(pol, gfp, order,
-					  interleave_nodes(pol));
-	else
-		page = __alloc_pages_nodemask(gfp, order,
-				policy_node(gfp, pol, numa_node_id()),
-				policy_nodemask(gfp, pol));
+		nid = interleave_nodes(pol);
 
-	return page;
+	return alloc_pages_policy(pol, gfp, order, nid);
 }
 EXPORT_SYMBOL(alloc_pages_current);
 
-- 
2.29.2