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Groups > linux.kernel > #1569491

[RFC V2 10/12] mm: Ignore madvise(MADV_MERGEABLE) request for VM_CDM marked VMAs

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VMA containing CDM memory should be excluded from KSM merging. This change
makes madvise(MADV_MERGEABLE) request on target VMA to be ignored.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
 mm/ksm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/ksm.c b/mm/ksm.c
index 9ae6011..2fb8939 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -37,6 +37,7 @@
 #include <linux/freezer.h>
 #include <linux/oom.h>
 #include <linux/numa.h>
+#include <linux/mempolicy.h>
 
 #include <asm/tlbflush.h>
 #include "internal.h"
@@ -1751,6 +1752,9 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
 				 VM_HUGETLB | VM_MIXEDMAP))
 			return 0;		/* just ignore the advice */
 
+		if (is_cdm_vma(vma))
+			return 0;
+
 #ifdef VM_SAO
 		if (*vm_flags & VM_SAO)
 			return 0;
-- 
2.9.3

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Thread

[RFC V2 00/12] Define coherent device memory node Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:40 +0100
  [RFC V2 05/12] cpuset: Add cpuset_inc() inside cpuset_init() Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:40 +0100
    Re: [RFC V2 05/12] cpuset: Add cpuset_inc() inside cpuset_init() Dave Hansen <dave.hansen@intel.com> - 2017-01-30 19:20 +0100
  [RFC V2 04/12] mm: Change mbind(MPOL_BIND) implementation for CDM nodes Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:40 +0100
  [DEBUG 16/21] mm: Enable CONFIG_MOVABLE_NODE on powerpc Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:50 +0100
  [DEBUG 18/21] mm: Add debugfs interface to dump each node's zonelist information Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:50 +0100
  [DEBUG 19/21] mm: Add migrate_virtual_range migration interface Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:50 +0100
  [DEBUG 17/21] mm: Export definition of 'zone_names' array through mmzone.h Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:50 +0100
  [DEBUG 15/21] powerpc/mm: Enable CONFIG_MOVABLE_NODE for PPC64 platform Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:50 +0100
  [DEBUG 21/21] selftests/powerpc: Add a script to perform random VMA migrations Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:50 +0100
  [DEBUG 14/21] powerpc/mm: Create numa nodes for hotplug memory Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:50 +0100
  [DEBUG 13/21] powerpc/mm: Identify coherent device memory nodes during platform init Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:50 +0100
  [DEBUG 20/21] drivers: Add two drivers for coherent device memory tests Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 04:50 +0100
  [RFC V2 09/12] mm: Exclude CDM marked VMAs from auto NUMA Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 07:10 +0100
  [RFC V2 12/12] mm: Tag VMA with VM_CDM flag explicitly during mbind(MPOL_BIND) Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 07:20 +0100
    Re: [RFC V2 12/12] mm: Tag VMA with VM_CDM flag explicitly during  mbind(MPOL_BIND) Dave Hansen <dave.hansen@intel.com> - 2017-01-30 19:00 +0100
  [RFC V2 10/12] mm: Ignore madvise(MADV_MERGEABLE) request for VM_CDM marked VMAs Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 10:30 +0100
  [RFC V2 11/12] mm: Tag VMA with VM_CDM flag during page fault Anshuman Khandual <khandual@linux.vnet.ibm.com> - 2017-01-30 10:40 +0100
    Re: [RFC V2 11/12] mm: Tag VMA with VM_CDM flag during page fault Dave Hansen <dave.hansen@intel.com> - 2017-01-30 19:00 +0100

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