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From: Feng Tang <feng.tang@intel.com>
To: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Ben Widawsky <ben.widawsky@intel.com>
Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
	Andrea Arcangeli <aarcange@redhat.com>,
	Mel Gorman <mgorman@techsingularity.net>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>, Andi Kleen <ak@linux.intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	ying.huang@intel.com, Feng Tang <feng.tang@intel.com>
Subject: [PATCH v6 2/6] mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy
Date: Mon, 12 Jul 2021 16:09:30 +0800	[thread overview]
Message-ID: <1626077374-81682-3-git-send-email-feng.tang@intel.com> (raw)
In-Reply-To: <1626077374-81682-1-git-send-email-feng.tang@intel.com>

The semantics of MPOL_PREFERRED_MANY is similar to MPOL_PREFERRED,
that it will first try to allocate memory from the preferred node(s),
and fallback to all nodes in system when first try fails.

Add a dedicated function for it just like 'interleave' policy.

Link: https://lore.kernel.org/r/20200630212517.308045-9-ben.widawsky@intel.com
Suggested-by: Michal Hocko <mhocko@suse.com>
Co-developed-by: Ben Widawsky <ben.widawsky@intel.com>
Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Signed-off-by: Feng Tang <feng.tang@intel.com>
---
 mm/mempolicy.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 17b5800b7dcc..d17bf018efcc 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2153,6 +2153,25 @@ static struct page *alloc_page_interleave(gfp_t gfp, unsigned order,
 	return page;
 }
 
+static struct page *alloc_page_preferred_many(gfp_t gfp, unsigned int order,
+						struct mempolicy *pol)
+{
+	struct page *page;
+
+	/*
+	 * This is a two pass approach. The first pass will only try the
+	 * preferred nodes but skip the direct reclaim and allow the
+	 * allocation to fail, while the second pass will try all the
+	 * nodes in system.
+	 */
+	page = __alloc_pages(((gfp | __GFP_NOWARN) & ~__GFP_DIRECT_RECLAIM),
+				order, first_node(pol->nodes), &pol->nodes);
+	if (!page)
+		page = __alloc_pages(gfp, order, numa_node_id(), NULL);
+
+	return page;
+}
+
 /**
  * alloc_pages_vma - Allocate a page for a VMA.
  * @gfp: GFP flags.
-- 
2.7.4


  parent reply	other threads:[~2021-07-12  9:04 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12  8:09 [PATCH v6 0/6] Introduce multi-preference mempolicy Feng Tang
2021-07-12  8:09 ` [PATCH v6 1/6] mm/mempolicy: Add MPOL_PREFERRED_MANY for multiple preferred nodes Feng Tang
2021-07-28 12:31   ` Michal Hocko
2021-07-28 14:11     ` Feng Tang
2021-07-28 16:12       ` Michal Hocko
2021-07-29  7:09         ` Feng Tang
2021-07-29 13:38           ` Michal Hocko
2021-07-29 15:12             ` Feng Tang
2021-07-29 16:21               ` Michal Hocko
2021-07-30  3:05                 ` Feng Tang
2021-07-30  6:36                   ` Michal Hocko
2021-07-30  7:18                     ` Feng Tang
2021-07-30  7:38                       ` Michal Hocko
2021-08-02  8:11                       ` Feng Tang
2021-08-02 11:14                         ` Michal Hocko
2021-08-02 11:33                           ` Feng Tang
2021-08-02 11:47                             ` Michal Hocko
2021-07-12  8:09 ` Feng Tang [this message]
2021-07-28 12:42   ` [PATCH v6 2/6] mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy Michal Hocko
2021-07-28 15:18     ` Feng Tang
2021-07-28 15:25       ` Feng Tang
2021-07-28 16:15         ` Michal Hocko
2021-07-28 16:14       ` Michal Hocko
2021-07-12  8:09 ` [PATCH v6 3/6] mm/mempolicy: enable page allocation for MPOL_PREFERRED_MANY for general cases Feng Tang
2021-07-12  8:09 ` [PATCH v6 4/6] mm/hugetlb: add support for mempolicy MPOL_PREFERRED_MANY Feng Tang
2021-07-21 20:49   ` Mike Kravetz
2021-07-22  8:11     ` Feng Tang
2021-07-22  9:42     ` Michal Hocko
2021-07-22 16:21       ` Mike Kravetz
2021-07-12  8:09 ` [PATCH v6 5/6] mm/mempolicy: Advertise new MPOL_PREFERRED_MANY Feng Tang
2021-07-28 12:47   ` Michal Hocko
2021-07-28 13:41     ` Feng Tang
2021-07-12  8:09 ` [PATCH v6 6/6] mm/mempolicy: unify the create() func for bind/interleave/prefer-many policies Feng Tang
2021-07-28 12:51   ` Michal Hocko
2021-07-28 13:50     ` Feng Tang
2021-07-15  0:15 ` [PATCH v6 0/6] Introduce multi-preference mempolicy Andrew Morton
2021-07-15  2:13   ` Feng Tang
2021-07-15 18:49   ` Dave Hansen

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