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authorLuiz Capitulino <lcapitulino@redhat.com>2012-10-05 16:47:57 -0300
committerDoug Goldstein <cardoe@cardoe.com>2013-01-18 21:02:09 -0600
commit18fad4723e8c220c2825b9975e6c7913085336a2 (patch)
treebf1ff1088dffc88b6b90f55fa02482c3f70b7c46
parentmigration: Fix madvise breakage if host and guest have different page sizes (diff)
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Call MADV_HUGEPAGE for guest RAM allocations
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 <lcapitulino@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> (cherry picked from commit ad0b5321f1f797274603ebbe20108b0750baee94)
-rw-r--r--exec.c1
-rw-r--r--osdep.h5
2 files changed, 6 insertions, 0 deletions
diff --git a/exec.c b/exec.c
index 3fdbbde0b..0ebdb4b31 100644
--- a/exec.c
+++ b/exec.c
@@ -2571,6 +2571,7 @@ 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 cb213e029..c5fd3d91f 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)