Re: [Qemu-devel] [PATCH] Call MADV_HUGEPAGE for guest RAM allocations

[Luiz Capitulino]

On Fri, 5 Oct 2012 16:47:57 -0300
Luiz Capitulino <address@hidden> wrote:

> 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>

ping?

> ---
>  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)
>