Comment 2 for bug 1582456

Hello Andrey,

MySQL starting with 5.7.6 supports page size up to 64K, so
`UNIV_PAGE_SIZE_MAX' is the upstream change. It would be not trivial to
change amount of memory needed for `incremental_buffer' without changing
`.delta' file format.

So, for the larger fix I started to draft this blueprint:

https://blueprints.launchpad.net/percona-xtrabackup/+spec/incremental-memory-limit

What I am going to do now is to replace `UNIV_PAGE_SIZE_MAX' with
`page_size', so for default page size we will still use 64M buffer.