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[Qemu-devel] [PATCH] Call MADV_HUGEPAGE for guest RAM allocations
From: |
Luiz Capitulino |
Subject: |
[Qemu-devel] [PATCH] Call MADV_HUGEPAGE for guest RAM allocations |
Date: |
Fri, 5 Oct 2012 16:47:57 -0300 |
This makes it possible for QEMU to use transparent huge pages (THP)
when transparent_hugepage/enabled=madvise. Otherwise THP is only
used when it's enabled system wide.
Signed-off-by: Luiz Capitulino <address@hidden>
---
exec.c | 1 +
osdep.h | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/exec.c b/exec.c
index 1114a09..7504909 100644
--- a/exec.c
+++ b/exec.c
@@ -2584,6 +2584,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void
*host,
cpu_physical_memory_set_dirty_range(new_block->offset, size, 0xff);
qemu_ram_setup_dump(new_block->host, size);
+ qemu_madvise(new_block->host, size, QEMU_MADV_HUGEPAGE);
if (kvm_enabled())
kvm_setup_guest_memory(new_block->host, size);
diff --git a/osdep.h b/osdep.h
index cb213e0..c5fd3d9 100644
--- a/osdep.h
+++ b/osdep.h
@@ -108,6 +108,11 @@ void qemu_vfree(void *ptr);
#else
#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
#endif
+#ifdef MADV_HUGEPAGE
+#define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
+#else
+#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
+#endif
#elif defined(CONFIG_POSIX_MADVISE)
--
1.7.12.315.g682ce8b
- [Qemu-devel] [PATCH] Call MADV_HUGEPAGE for guest RAM allocations,
Luiz Capitulino <=