On 08/20/2010 03:36 PM, Aaron Konstam wrote:
On Thu, 2010-08-19 at 16:15 -0500, Michael Hennebry wrote:
> On Thu, 19 Aug 2010, JD wrote:
>
>> Problem comes as Michael explains, that when a process needs a large
>> "physically contiguous" chunk of memory, it might not be available.
>> That said, usually, requests for physically contiguous memory is only
>> needed when wanting to map very large number of DMA pages for
>> doing direct physical I/O.
>> Otherwise, a process itself does not need to have physically contiguous
>> pages. Only the virtual space allocated to that "malloc" or large
buffer
>> declaration in a program, is contiguous.
>
> Why would malloc or a large buffer declaration
> require physically contiguous memory?
I have te equally interesting question? Why you think malloc allocates
memory blocks in the swap area.
JD didn't say that.
He said that when a process needs a large physically contiguous chunk of memory,
you may need to use swap space to move other processes out of the way.
Andrew.