Interpretation of bit patters in arena_chunk_map_bits_s

[Jason Evans]

On Mar 8, 2016, at 11:33 AM, Yasaswini G <yasaswinig7 at gmail.com> wrote:
> Hi,
> 
> What does the three patterns signify under each one of the allocation type (unallocated(dirty/clean), small, large)  in "arena_chunk_map_bits_s"
> 
> I understand the allocation types (unallocated, small, large),  but I am not sure why there are three different patters under each allocation type.
> 
> For example under Unallocated (clean), we have following bit patterns: 
>      Unallocated (clean):
>      *     ssssssss ssssssss sss+++++ +++dum-a         - pattern1

The above corresponds to the first page within a run.

>      *     xxxxxxxx xxxxxxxx xxxxxxxx xxx-Uxxx             - pattern2

The above corresponds to an interior page within a run.

>      *     ssssssss ssssssss sss+++++ +++dUm-a         - pattern3

The above corresponds to the last page within a run.

Jason
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