On Thu, Nov 15, 2018 at 08:09:07PM +0200, Ahmed Abd El Mawgood wrote: > From: Ahmed Abd El Mawgood <ahmedsoliman@xxxxxxxxxxx> > > madvise() returns -1 without CONFIG_TRANSPARENT_HUGEPAGE=y. That would > trigger asserts when checking for return value of madvice. Following > similar decision to [1]. I thought it is ok to assume that madvise() > failures implies that THP is not supported by host kernel. > > Other options were to check for Transparent Huge Page support in > /sys/kernel/mm/transparent_hugepage/enabled. > > -- links -- > [1] https://lists.gnu.org/archive/html/qemu-devel/2015-11/msg04514.html > > Signed-off-by: Ahmed Abd El Mawgood <ahmedsoliman@xxxxxxxxxxx> > --- > tools/testing/selftests/kvm/lib/kvm_util.c | 14 ++++++-------- > 1 file changed, 6 insertions(+), 8 deletions(-) > > diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c > index 1b41e71283d5..7725cfdf1b79 100644 > --- a/tools/testing/selftests/kvm/lib/kvm_util.c > +++ b/tools/testing/selftests/kvm/lib/kvm_util.c > @@ -586,14 +586,12 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, > src_type == VM_MEM_SRC_ANONYMOUS_THP ? huge_page_size : 1); > > /* As needed perform madvise */ > - if (src_type == VM_MEM_SRC_ANONYMOUS || src_type == VM_MEM_SRC_ANONYMOUS_THP) { > - ret = madvise(region->host_mem, npages * vm->page_size, > - src_type == VM_MEM_SRC_ANONYMOUS ? MADV_NOHUGEPAGE : MADV_HUGEPAGE); > - TEST_ASSERT(ret == 0, "madvise failed,\n" > - " addr: %p\n" > - " length: 0x%lx\n" > - " src_type: %x", > - region->host_mem, npages * vm->page_size, src_type); > + if (src_type == VM_MEM_SRC_ANONYMOUS) { > + madvise(region->host_mem, npages * vm->page_size, > + MADV_NOHUGEPAGE); This is fine. > + } else if (src_type == VM_MEM_SRC_ANONYMOUS_THP) { > + madvise(region->host_mem, npages * vm->page_size, > + MADV_HUGEPAGE); I would still assert here, but with a more informative message like "madvise(MADV_HUGEPAGE) failed. Does the kernel have CONFIG_TRANSPARENT_HUGEPAGE=y?" > } > > region->unused_phy_pages = sparsebit_alloc(); > -- > 2.18.1 > Thanks, drew
