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[2/4] kvmtool: ARM: pass MADV_HUGEPAGE to madvise

Message ID 1398359406-31650-3-git-send-email-marc.zyngier@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Marc Zyngier April 24, 2014, 5:10 p.m. UTC 
If the host kernel is configured with CONFIG_TRANSPARENT_HUGEPAGE_MADVISE,
it is important to madvise(MADV_HUGEPAGE) the memory region.
Otherwise, the guest won't benefit from using THP.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
 tools/kvm/arm/kvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox

Patch

diff --git a/tools/kvm/arm/kvm.c b/tools/kvm/arm/kvm.c
index d0d64ff..58ad9fa 100644
--- a/tools/kvm/arm/kvm.c
+++ b/tools/kvm/arm/kvm.c
@@ -79,7 +79,7 @@  void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
 					SZ_2M);
 
 	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
-		MADV_MERGEABLE);
+		MADV_MERGEABLE | MADV_HUGEPAGE);
 
 	/* Initialise the virtual GIC. */
 	if (gic__init_irqchip(kvm))