SAP HANA consumes all space and make system slow.

Dear Experts,

I have sap hana details as below.

i started the database just 30 minute ago and then i took this scree-shot.

and its os free-g is as below. and os is suse.

But after 10 to 12 hours of the restart free space would be only 1 GB. this is what i realized and mh hana system will start behaving slowly and my s4 application users will face slowness issue.. So what could i do to solve this problem. I have googled a lot but still not geeting any clue. How can i keep my os memory free atleast 10 gb.

I am using hana 1.0 sp11 will be upgrading it soon as well.

Please suggest.