search for: ksm

Hi, This is a very very strange thing I have seen in Linux Kernel. I wrote a simple program, all it does is to load a file into memory. This programming is running on a virtual machine while linux-kvm is working as the hypervisor. I enabled ksm in the hypervisor level, my host machine was installed with a Opensuse11.4 while the guest OS is Fedora14, the strange thing is, whenever I run following simple program, the number exported by /sys/kernel/mm/ksm/page_sharing increase dramatically, I mean, no matter what file I am loading, the corre...

Hi, This is a very very strange thing I have seen in Linux Kernel. I wrote a simple program, all it does is to load a file into memory. This programming is running on a virtual machine while linux-kvm is working as the hypervisor. I enabled ksm in the hypervisor level, my host machine was installed with a Opensuse11.4 while the guest OS is Fedora14, the strange thing is, whenever I run following simple program, the number exported by /sys/kernel/mm/ksm/page_sharing increase dramatically, I mean, no matter what file I am loading, the corre...

Greetings Xen Users, I am trying to bring up xen-4.0.1-0.1.rc4.fc13 on an up to date FC 13 Dell Precision 690. For dom0, I am using the 2.6.32.17 PVOPS kernel. Xen boots and the kernel boots until it reaches a point where KSM fails (as it should, since KSM is compiled out) but hangs, because it cannot find /sys/kernel/mm/ksm/sleep_millisecs and friends. I have booted the kernel on bare metal (KSM failed but did not hang the boot) and used chkconfig to turn KSM off. After the KSM service was configured off, I could boot...

Hi, Could anyone provide (or point me to) information on how KSM merging behaves when performing live migrations? Does libvirt perform any special work to trigger KSM scanning of the migrated pages? Any guidance is appreciated. James

I have had ksm[2] causing a high load (on recent centos7), such things have been reported before[1]. I suspect that this could be related to windows vm's. I am having not that many vm's in the current setup, and this load increased on the hosts with a few windows vm's that are already generating m...

Are their any good guides out there on how to use ksmctl to enable and tune KSM performance on Centos/RedHat At the moment the only guidelines I can find are from the following OLS paper, plus the Linux Kernel Docs. * http://www.kernel.org/doc/ols/2009/ols2009-pages-19-28.pdf * http://www.kernel.org/doc/Documentation/vm/ksm.txt On a basic dual cor...

...lsyms] [k] _raw_spin_lock - _raw_spin_lock + 45.30% kvm_mmu_sync_roots + 28.49% kvm_mmu_load + 25.00% mmu_free_roots + 1.12% tdp_page_fault ?n joi, 18 aug. 2016 la 11:59, Laurentiu Soica <laurentiu at soica.ro> a scris: > I've tried with KSM disabled and nothing changed. > > I've upgraded KVM to qemu-kvm-ev. I'm waiting to see if there are any > improvements and report back. > > ?n mie., 17 aug. 2016 la 15:10, Boris Derzhavets <bderzhavets at hotmail.com> > a scris: > >> For myself KSM is unpred...

Hi guys, Any chance we could get KSM support in centos 5.4? Maybe the centosplus ones or a gift from elrepo.

On 07/31/2017 02:55 PM, Michal Hocko wrote: > On Mon 31-07-17 12:13:33, Wei Wang wrote: >> Ballooned pages will be marked as MADV_DONTNEED by the hypervisor and >> shouldn't be given to the host ksmd to scan. > Could you point me where this MADV_DONTNEED is done, please? Sure. It's done in the hypervisor when the balloon pages are received. Please see line 40 at https://github.com/qemu/qemu/blob/master/hw/virtio/virtio-balloon.c > >> Therefore, it is not >> necessary...

On 07/31/2017 02:55 PM, Michal Hocko wrote: > On Mon 31-07-17 12:13:33, Wei Wang wrote: >> Ballooned pages will be marked as MADV_DONTNEED by the hypervisor and >> shouldn't be given to the host ksmd to scan. > Could you point me where this MADV_DONTNEED is done, please? Sure. It's done in the hypervisor when the balloon pages are received. Please see line 40 at https://github.com/qemu/qemu/blob/master/hw/virtio/virtio-balloon.c > >> Therefore, it is not >> necessary...

...ernel. I can not go through the step "Verify the Xen step after reboot", when I reboot and choose the new kernel, the system hang on "Starting xend daemon", so the new kernel could not be booted, and I can not verify the Xen setup. The information on screen are "/usr/sbin/ksmtuned: line 64: /sys/kernel/mm/ksm/pages_to_scan: No such file or directory" "/usr/sbin/ksmtuned: line 65: /sys/kernel/mm/ksm/sleep_millisecs: No such file or directory" "/usr/sb...

...I'm running FreeBSD with Samba 3.0.28 and have had success previously with FreeBSD and an earlier version of Samba, and am in the process of setting up a member server to act as a file server using the above combination. I have created a kerberos ticket, and successfully joined the domain: ksm-smb# net ads join -UAdministrator%password Using short domain name -- END-DESIGN Joined 'KSM-SMB' to realm 'END-DESIGN.PRI' ksm-smb# net ads testjoin Join is OK ksm-smb# However, I get from log.winbindd-idmap: [2008/01/14 09:57:38, 1] nsswitch/idmap.c:idmap_init(377) Initializi...

For myself KSM is unpredictable feature. The problem is Compute, just this node does "copy on write" , so only Compute. My concern exactly is where would it lead to worse or better Guest behavior ? I am not expecting complete fix. I would track via top/htop and dmesg via Cron on 1-2 hr period. _...

...ock > > > + 45.30% kvm_mmu_sync_roots > > > + 28.49% kvm_mmu_load > > > + 25.00% mmu_free_roots > > > + 1.12% tdp_page_fault > > ?n joi, 18 aug. 2016 la 11:59, Laurentiu Soica a > scris: > >> I've tried with KSM disabled and nothing changed. >> >> I've upgraded KVM to qemu-kvm-ev. I'm waiting to see if there are >> any improvements and report back. >> >> ?n mie., 17 aug. 2016 la 15:10, Boris Derzhavets >> <bderzhavets at hotmail.com> a scris: >> &g...

...t; >>>On 07/31/2017 02:55 PM, Michal Hocko wrote: > >>>> >On Mon 31-07-17 12:13:33, Wei Wang wrote: > >>>>> >>Ballooned pages will be marked as MADV_DONTNEED by the hypervisor and > >>>>> >>shouldn't be given to the host ksmd to scan. > >>>> >Could you point me where this MADV_DONTNEED is done, please? > >>> > >>>Sure. It's done in the hypervisor when the balloon pages are received. > >>> > >>>Please see line 40 at > >>>https://github.com...

It sounds weird, but attempt to disable KSM and see would it help or no ? ________________________________ From: centos-virt-bounces at centos.org <centos-virt-bounces at centos.org> on behalf of Laurentiu Soica <laurentiu at soica.ro> Sent: Wednesday, August 17, 2016 4:56 AM To: Discussion about the virtualization on CentOS Su...

I've tried with KSM disabled and nothing changed. I've upgraded KVM to qemu-kvm-ev. I'm waiting to see if there are any improvements and report back. ?n mie., 17 aug. 2016 la 15:10, Boris Derzhavets <bderzhavets at hotmail.com> a scris: > For myself KSM is unpredictable feature. The problem is Comp...

...t; > > struct vhost_virtqueue **vqs, int nvqs, int iov_limit) > > > > > { > > > > I also wonder here: when page is write protected then > > > > it does not look like .invalidate_range is invoked. > > > > > > > > E.g. mm/ksm.c calls > > > > > > > > mmu_notifier_invalidate_range_start and > > > > mmu_notifier_invalidate_range_end but not mmu_notifier_invalidate_range. > > > > > > > > Similarly, rmap in page_mkclean_one will not call > > > > mmu_no...

...t; > > struct vhost_virtqueue **vqs, int nvqs, int iov_limit) > > > > > { > > > > I also wonder here: when page is write protected then > > > > it does not look like .invalidate_range is invoked. > > > > > > > > E.g. mm/ksm.c calls > > > > > > > > mmu_notifier_invalidate_range_start and > > > > mmu_notifier_invalidate_range_end but not mmu_notifier_invalidate_range. > > > > > > > > Similarly, rmap in page_mkclean_one will not call > > > > mmu_no...

...gi-oh.kim at profitbricks.com> Signed-off-by: Minchan Kim <minchan at kernel.org> --- Documentation/filesystems/Locking | 4 + Documentation/filesystems/vfs.txt | 11 ++ Documentation/vm/page_migration | 107 +++++++++++++++++- include/linux/fs.h | 2 + include/linux/ksm.h | 3 +- include/linux/migrate.h | 5 + include/linux/mm.h | 1 + include/linux/page-flags.h | 29 +++-- mm/compaction.c | 47 +++++--- mm/ksm.c | 4 +- mm/migrate.c | 222 ++++++...