On Wed, Jun 22, 2016 at 11:17:54PM +0300, Cyrill Gorcunov wrote: > On Wed, Jun 22, 2016 at 12:56:56PM -0700, Dave Hansen wrote: > > > > Yeah, cgroups don't make a lot of sense. > > > > On x86, the 48-bit virtual address is even hard-coded in the ABI[1]. So > > we can't change *any* program's layout without either breaking the ABI > > or having it opt in. > > > > But, we're also lucky to only have one VA layout since day one. > > > > 1. www.x86-64.org/documentation/abi.pdf - “... Therefore, conforming > > processes may only use addresses from 0x00000000 00000000 to 0x00007fff > > ffffffff .” > > Yes, but noone forces you to write conforming programs ;) > After all while hw allows you to run VA with bits > than > 48 it's fine, all side effects of breaking abi is up to > program author (iirc on x86 there is up to 52 bits on > hw level allowed, don't have specs under my hands?) Nope. 48-bit VA (47-bit to userspace) and 46-bit PA. -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>