> Am 22.06.2022 um 12:52 schrieb Janne Johansson <icepic...@gmail.com>: > > >> >> I found relatively large allocations in the qemu smaps and checked the >> contents. It contained several hundred repetitions of osd and pool names. We >> use the default builds on Ubuntu 20.04. Is there a special memory allocator >> in place that might not clean up properly? > > I think the promise from the OS could be stated as "pages are > guaranteed to get cleaned before handed over to the next process", but > if that happens at free() or any time in between is probably later > than one thinks. (zero-fill-on-demand is a thing) > > Some OSes have page clearing done in a maximum lowprio > process-or-thread that uses otherwise idle CPU time to pre-clean > pages, but if that is a win or not seems to depend a lot on if this > destroys your L1 caches for the running processes and so forth. > > So just as with disks, finding memory pages with junk data still in > them is not a huge surprise.
Hi Janne, the areas i see are still dirty and allocated to the Qemu process. I am confused by the size they are up to 64MB in size. As far as I know there is no special allocator on place so I wonder why there are so big allocations. Peter > > -- > May the most significant bit of your life be positive. _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
