From 18fad4723e8c220c2825b9975e6c7913085336a2 Mon Sep 17 00:00:00 2001 From: Luiz Capitulino Date: Fri, 5 Oct 2012 16:47:57 -0300 Subject: 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 Signed-off-by: Anthony Liguori (cherry picked from commit ad0b5321f1f797274603ebbe20108b0750baee94) --- exec.c | 1 + osdep.h | 5 +++++ 2 files changed, 6 insertions(+) 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) -- cgit v1.2.3-65-gdbad