During the life of a process, lots of segments might be created and destroyed, so there might be many hole inside the address space, suppose we need to allocate a segment (use mmap to create a anonymous meomry) whose size is 10M, but the first 1000 holes in address space solaris could find is only 1M.
My question is: 1: is the time searching for a free space of 10M counted as sys cpu or user cpu? 2: What's the algorithm solaris used to find the free space. We are using hoad as memory allocator, if using pmap to show the segment, there are 100K+ segments inside the space address, so I am wondering whether we would use lots of sys cpu to manage these huge number of segment. I am reading the book "solaris internal", but still can't find the answer about how solaris create a new segment.
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