DevConf.cz 2018 has ended

DevConf.cz 2018 is the 10th annual, free, Red Hat sponsored community conference for developers, admins, DevOps engineers, testers, documentation writers and other contributors to open source technologies such as Linux, Middleware, Virtualization, Storage, Cloud and mobile where FLOSS communities sync, share, and hack on upstream projects together in the beautiful city of Brno, Czech Republic.

When: Friday, January 26 to Sunday, January 28, 2018

Venue: Faculty of Information Technology (VUT FIT - Božetěchova 2, Brno)


  • Friday 17:15: at the venue there will be a surprise show, stick around!
  • Saturday 19:00: the social event starts at Fleda Club. TICKET IS REQUIRED. Tickets will be distributed each day at check-in. First come, first serve.
  • Sunday 17:00: there will be many prizes given away at the closing session.
Back To Schedule
Saturday, January 27 • 11:00am - 11:23am
Eliminating guest page cache

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To fit more guests into system, we need to reduce memory footprint of individual guests. Our observation is big part of guest memory is page cache. Guest page cache grows large because of guest disk read/write accesses and there is no coordination between guest & host which pages should be swapped out when there is memory pressure at host side.<br>In this talk we will present solution to this problem. How we are eliminating guest page cache using QEMU fake DAX (Direct access) with guest persistent memory range. Also, we will discuss design & implementation details of new flushing interface required to persist guest changes to the backing storage. In addition to this, we will also talk about KVM guest page hinting and how both the above solutions help to solve the actual problem.

avatar for Pankaj Gupta

Pankaj Gupta

Software Engineer, RedHat
Working with Red Hat in virtualization group. Currently working in areas of realtime KVM & guest memory management.

Saturday January 27, 2018 11:00am - 11:23am CET
G-E105 Faculty of Information Technology (VUT FIT)