On Fri, Jul 3, 2015 at 1:23 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
> On 2 July 2015 at 16:30, Sawada Masahiko <sawada.mshk@gmail.com> wrote:
>
>>
>> Also, the flags of each heap page header might be set PD_ALL_FROZEN,
>> as well as all-visible
>
>
> Is it possible to have VM bits set to frozen but not visible?
>
> The description makes those two states sound independent of each other.
>
> Are they? Or not? Do we test for an impossible state?
>
It's impossible to have VM bits set to frozen but not visible.
These bit are controlled independently. But eventually, when
all-frozen bit is set, all-visible is also set.
Regards,
--
Sawada Masahiko