2017-11-06 22:08 GMT+08:00 Paolo Bonzini <pbonz...@redhat.com>: > On 06/11/2017 13:18, Wanpeng Li wrote: >> 2017-11-06 20:02 GMT+08:00 Paolo Bonzini <pbonz...@redhat.com>: >>> On 06/11/2017 12:59, Fam Zheng wrote: >>>>>> Could you point out the patchset for the fix? >>>>> Between 447b0d0b9ee8a0ac216c3186e0f3c427a1001f0c and >>>>> 092aa2fc65b7a35121616aad8f39d47b8f921618. >>>> Not sure how these relate to the core size, but I've tested upstream >>>> (ec7a8bf0b8f7dc7288fe8745464ee8217528cc6c) and with dump-guest-core=off >>>> the core >>>> file is 363M, still significantly larger than rss (~73M). >>>> >>>> What is bloating the core file? >>> >>> My guess would have been fragmented heap. The core file, unlike the >>> RSS, includes all the mmaped memory (e.g. from shared libraries) that >>> has never been used. >>> >>> For example, all the Ceph/Gluster/PulseAudio/SPICE/whatever libraries >>> are included in the core file but likely are not in the RSS. >> >> Do you mean not use Memory API will avoid the fragmented heap? > > The high memory usage from the memory API causes excessive > fragmentation. Alexey's work should help reducing memory usage and thus > the fragmentation.
But as Fam mentioned, the latest qemu still has issue. Regards, Wanpeng Li