On Tue, 2009-12-01 at 15:35 +0100, Segher Boessenkool wrote:
> So make the memory known to the kernel, just tell the kernel not to
> use it. If it's normal system RAM, just put it in the "memory" node
> and do a memreserve on it (or do something in your platform code); if
> it's some other memory,
On Tue, 2009-12-01 at 19:34 +0800, Li Yang wrote:
> The scenario for the second case is to pre-allocate some memory to a
> certain application or device (probably through mem=XXX kernel
> parameter or limit through device tree). The memory is not known to
> kernel, but fully managed by the applica
On Thu, Dec 3, 2009 at 12:15 PM, Segher Boessenkool
wrote:
The scenario for the first case is that in a multicore system running
ASMP which means different OS runs on different cores. They might
communicate through a shared memory region. The region on every OS
need to be map
The scenario for the first case is that in a multicore system
running
ASMP which means different OS runs on different cores. They might
communicate through a shared memory region. The region on every OS
need to be mapped with the same cache perperty to avoid cache
paradox.
This isn't true.
On Tue, Dec 1, 2009 at 10:35 PM, Segher Boessenkool
wrote:
>> The scenario for the first case is that in a multicore system running
>> ASMP which means different OS runs on different cores. They might
>> communicate through a shared memory region. The region on every OS
>> need to be mapped with
The scenario for the first case is that in a multicore system running
ASMP which means different OS runs on different cores. They might
communicate through a shared memory region. The region on every OS
need to be mapped with the same cache perperty to avoid cache paradox.
This isn't true. In
On Tue, Dec 1, 2009 at 6:58 PM, Benjamin Herrenschmidt
wrote:
> On Tue, 2009-12-01 at 18:30 +0800, Li Yang wrote:
>> The patch adds the ability for powerpc architecture to set page cache
>> property of mmaped area through device tree. This is useful for two
>> cases. First, for memory shared wit
On Tue, 2009-12-01 at 18:30 +0800, Li Yang wrote:
> The patch adds the ability for powerpc architecture to set page cache
> property of mmaped area through device tree. This is useful for two
> cases. First, for memory shared with other OS'es to have the same cache
> property to avoid cache parad
The patch adds the ability for powerpc architecture to set page cache
property of mmaped area through device tree. This is useful for two
cases. First, for memory shared with other OS'es to have the same cache
property to avoid cache paradoxes. Second, enabling application to map
memory which is
