On Thu, Jan 16, 2014 at 1:01 PM, Alex Thorlton <athorl...@sgi.com> wrote: > This patch adds an mm flag (MMF_THP_DISABLE) to disable transparent > hugepages using prctl. >
> --- a/kernel/sys.c > +++ b/kernel/sys.c > @@ -1998,6 +1998,17 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, > arg2, unsigned long, arg3, > if (arg2 || arg3 || arg4 || arg5) > return -EINVAL; > return current->no_new_privs ? 1 : 0; > + case PR_SET_THP_DISABLE: > + if (arg2) > + set_bit(MMF_THP_DISABLE, &me->mm->flags); > + else > + clear_bit(MMF_THP_DISABLE, &me->mm->flags); > + break; > + case PR_GET_THP_DISABLE: > + error = put_user(test_bit(MMF_THP_DISABLE, > + &me->mm->flags), > + (int __user *) arg2); > + break; Usual nit: please return -EINVAL if unused args are nonzero. This makes it possible to extend these APIs in the future. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
