On 11/5/12 5:49 PM, Minchan Kim wrote:
Also, memory allocators have a second motivation in using madvise: to
create virtually contiguous regions of memory from a fragmented address
space, without increasing the RSS.
I don't get it. How do we create contiguos region by madvise?
Just out of curiosity.
Could you elaborate that use case? :)
By using a new anonymous map and faulting pages in.
The fragmented virtual memory is released via MADV_DONTNEED and if the
malloc/free activity on the system is dominated by one process, chances
are that the newly faulted in page is the one released by the same
process :)
The net effect is that physical pages within a single address space are
rearranged so larger allocations can be satisfied.
-Arun
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