| Message ID | 20200212222935.GA3421@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Enable PM hibernation on guest VMs | expand |
Ancha, Anchal Agarwal <anchalag@amazon.com> writes: > Hello, > I am sending out a v3 version of series of patches that implements guest > PM hibernation. can you pretty please thread your patch series so that the 1-n/n mails have a References: <message-id-of-0-of-n-mail@whateveryourclientputsthere> in the headers? git-send-email does that proper as do other tools. Collecting the individual mails is painful. Thanks, tglx
I did resend them today. Apologies for delay
https://lkml.org/lkml/2020/2/14/2789
Thanks,
Anchal
Ancha,
Anchal Agarwal <anchalag@amazon.com> writes:
> Hello,
> I am sending out a v3 version of series of patches that implements guest
> PM hibernation.
can you pretty please thread your patch series so that the 1-n/n mails
have a
References: <message-id-of-0-of-n-mail@whateveryourclientputsthere>
in the headers? git-send-email does that proper as do other tools.
Collecting the individual mails is painful.
Thanks,
tglx
Hello, I am sending out a v3 version of series of patches that implements guest PM hibernation. These guests are running on xen hypervisor. The patches had been tested against mainstream kernel. EC2 instance hibernation feature is provided to the AWS EC2 customers. PM hibernation uses swap space carved out within the guest[or can be a separate partition], where hibernation image is stored and restored from. Doing guest hibernation does not involve any support from hypervisor and this way guest has complete control over its state. Infrastructure restrictions for saving up guest state can be overcome by guest initiated hibernation. This series includes some improvements over RFC series sent last year: https://lists.xenproject.org/archives/html/xen-devel/2018-06/msg00823.html Changelog v3: 1. Feedback from V2 2. Introduced 2 new patches for xen sched clock offset fix 3. Fixed pirq shutdown/restore in generic irq subsystem 4. Split save/restore steal clock patches into 2 for better readability Changelog v2: 1. Removed timeout/request present on the ring in xen-blkfront during blkfront freeze 2. Fixed restoring of PIRQs which was apparently working for 4.9 kernels but not for newer kernel. [Legacy irqs were no longer restored after hibernation introduced with this commit "020db9d3c1dc0"] 3. Merged couple of related patches to make the code more coherent and readable 4. Code refactoring 5. Sched clock fix when hibernating guest is under heavy CPU load Note: Under very rare circumstances we see resume failures with KASLR enabled only on xen instances. We are roughly seeing 3% failures [>1000 runs] when testing with various instance sizes and some workload running on each instance. I am currently investigating the issue as to confirm if its a xen issue or kernel issue. However, it should not hold back anyone from reviewing/accepting these patches. Testing done: All testing is done for multiple hibernation cycle for 5.4 kernel on EC2. Testing How to: --------------- Example: Set up a file-backed swap space. Swap file size>=Total memory on the system sudo dd if=/dev/zero of=/swap bs=$(( 1024 * 1024 )) count=4096 # 4096MiB sudo chmod 600 /swap sudo mkswap /swap sudo swapon /swap Update resume device/resume offset in grub if using swap file: resume=/dev/xvda1 resume_offset=200704 Execute: -------- sudo pm-hibernate OR echo disk > /sys/power/state && echo reboot > /sys/power/disk Compute resume offset code: " #!/usr/bin/env python import sys import array import fcntl #swap file f = open(sys.argv[1], 'r') buf = array.array('L', [0]) #FIBMAP ret = fcntl.ioctl(f.fileno(), 0x01, buf) print buf[0] " Aleksei Besogonov (1): PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP_AREA Anchal Agarwal (4): x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume genirq: Shutdown irq chips in suspend/resume during hibernation xen: Introduce wrapper for save/restore sched clock offset xen: Update sched clock offset to avoid system instability in hibernation Munehisa Kamata (7): xen/manage: keep track of the on-going suspend mode xenbus: add freeze/thaw/restore callbacks support x86/xen: add system core suspend and resume callbacks xen-netfront: add callbacks for PM suspend and hibernation support xen-blkfront: add callbacks for PM suspend and hibernation xen/time: introduce xen_{save,restore}_steal_clock x86/xen: save and restore steal clock arch/x86/xen/enlighten_hvm.c | 8 ++ arch/x86/xen/suspend.c | 72 ++++++++++++++++++ arch/x86/xen/time.c | 18 ++++- arch/x86/xen/xen-ops.h | 3 + drivers/block/xen-blkfront.c | 119 ++++++++++++++++++++++++++++-- drivers/net/xen-netfront.c | 98 +++++++++++++++++++++++- drivers/xen/events/events_base.c | 1 + drivers/xen/manage.c | 73 ++++++++++++++++++ drivers/xen/time.c | 29 +++++++- drivers/xen/xenbus/xenbus_probe.c | 99 ++++++++++++++++++++----- include/linux/irq.h | 2 + include/xen/xen-ops.h | 8 ++ include/xen/xenbus.h | 3 + kernel/irq/chip.c | 2 +- kernel/irq/internals.h | 1 + kernel/irq/pm.c | 31 +++++--- kernel/power/user.c | 6 +- 17 files changed, 533 insertions(+), 40 deletions(-)