Comment 1 for bug 1079044

Since change buffers are maintained as index tree in the buffer pool, the size given in

'Ibuf: size 1, free list len 0, seg size 2, 0 merges'

multiplied by UNIV_PAGE_SIZE should give the total size of the insert buffer in memory in kB.

However, it might need to be checked whether "Database pages"
under "BUFFER POOL AND MEMORY" includes the pages of change
buffer or not.

I also checked I_S.BUFFER_POOL_PAGES, and noticed that Ibuf pages
are not included there.