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Call MADV_HUGEPAGE for guest RAM allocations

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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>
This commit is contained in:
Luiz Capitulino 2012-10-05 16:47:57 -03:00 • committed by Anthony Liguori
parent f526f3c315
commit ad0b5321f1
2 changed files with 6 additions and 0 deletions
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1
exec.c
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@ -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);

5
osdep.h
View file

@ -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)