Latest memory size virtual Weblinks:
- Re: how to get physical memory address from virtual memory address
So what happens if you 'malloc' more memory than is physically present? What happens if three programs each 'malloc' a block that is equal in size to half of physical memory? What would be the point of swap if this were the case? Yes, it can change at any time. It can even change such that there is not one. And because Linux is demand paged, when you first allocate or- Re: how to get physical memory address from virtual memory address
Of course, you are wrong. Virtual addresses /only/ have corresponding physical addresses when they are used in a memory reference. Pure "allocation" (malloc()) doesn't result in a memory reference, so no real address is assigned. (FWIW, this is why the OOM killer works the way it does - it kills processes that have allocated memory- Re: how to get physical memory address from virtual memory address
Hari wrote: There isn't one. You haven't allocated any physical memory, so the kernel doesn't give you any. DS- Flat cell read only memory using common contacts for bit lines and virtual ground lines
In a flat cell read only memory, two bit lines or two virtual ground lines share a common contact such that the contact is slightly adjustable in its location for inserting a local metal word line without increasing the layout area to improve the reading speed of the memory. Moreover,...- Re: how to get physical memory address from virtual memory address
Where does the physical memory come from when you turn on virtual memory overcommits? Look at Documentation/vm/overcommit-ac counting in your kernel sources. Setting vm.overcommit_memory=1 is indeed useful in some circumstances but can lead to unpredictable process deaths.- Re: how to get physical memory address from virtual memory address
Correct, if by "valid" you mean "mapped and present" so that touching the page doesn't give rise to an exception. However, there can be mapped pages which are not present. Change or disappear temporarily (become not present).
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