+ mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch added to -mm tree

* + mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch added to -mm tree
@ 2021-07-15  0:16 akpm
  0 siblings, 0 replies; 2+ messages in thread
From: akpm @ 2021-07-15  0:16 UTC (permalink / raw)
  To: aarcange, ak, ben.widawsky, dan.j.williams, dave.hansen,
	feng.tang, mgorman, mhocko, mhocko, mike.kravetz, mm-commits,
	rdunlap, rientjes, vbabka, ying.huang


The patch titled
     Subject: mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy
has been added to the -mm tree.  Its filename is
     mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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------------------------------------------------------
From: Feng Tang <feng.tang@intel.com>
Subject: mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy

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
Link: https://lkml.kernel.org/r/1626077374-81682-3-git-send-email-feng.tang@intel.com
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Co-developed-by: Ben Widawsky <ben.widawsky@intel.com>
Suggested-by: Michal Hocko <mhocko@suse.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mempolicy.c |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

--- a/mm/mempolicy.c~mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy
+++ a/mm/mempolicy.c
@@ -2153,6 +2153,25 @@ static struct page *alloc_page_interleav
 	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.
_

Patches currently in -mm which might be from feng.tang@intel.com are

mm-memplicy-add-page-allocation-function-for-mpol_preferred_many-policy.patch
mm-mempolicy-unify-the-create-func-for-bind-interleave-prefer-many-policies.patch


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