Mysqld memory load

MySQL & MariaDB Other MySQL® Questions
1

I’m using version: 5.5.28-29.1 Percona Server (GPL), Release 29.1
3 days ago mysql starts to eat more memory, than usually.
And I cant find why. Load is the same for a long period of time. Restart doesnt help.
I`ve attached munin graph. Can anyone help to find problem?

2

You mean it is using less memory. Maybe you restarted it, and old pages do not fill the buffer pool as they have not been read yet.

3

I mean that Percona was using less memory than now.