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Message #167198
[Bug 1542941] Re: Regression: problems migrating recent wily/vivid Xen VMs due to memory hotplug fix
This bug was fixed in the package linux - 3.19.0-56.62
---------------
linux (3.19.0-56.62) vivid; urgency=low
[ Brad Figg ]
* Release Tracking Bug
- LP: #1555832
[ Florian Westphal ]
* SAUCE: [nf,v2] netfilter: x_tables: don't rely on well-behaving
userspace
- LP: #1555338
linux (3.19.0-55.61) vivid; urgency=low
[ Brad Figg ]
* Release Tracking Bug
- LP: #1554708
[ Upstream Kernel Changes ]
* Revert "drm/radeon: call hpd_irq_event on resume"
- LP: #1554608
linux (3.19.0-54.60) vivid; urgency=low
[ Luis Henriques ]
* Release Tracking Bug
- LP: #1552337
[ Upstream Kernel Changes ]
* Revert "firmware: dmi_scan: Fix UUID endianness for SMBIOS >= 2.6"
- LP: #1551419
linux (3.19.0-53.59) vivid; urgency=low
[ Kamal Mostafa ]
* Release Tracking Bug
- LP: #1550576
[ Kamal Mostafa ]
* Merged back 3.19.0-52.58
linux (3.19.0-52.58) vivid; urgency=low
[ Brad Figg ]
* Release Tracking Bug
- LP: #1548548
[ Dan Streetman ]
* SAUCE: nbd: ratelimit error msgs after socket close
- LP: #1505564
[ Upstream Kernel Changes ]
* Revert "ACPI / LPSS: allow to use specific PM domain during ->probe()"
- LP: #1542457
* Revert "workqueue: make sure delayed work run in local cpu"
- LP: #1546320
* net: ipmr: fix static mfc/dev leaks on table destruction
- LP: #1542457
* drm/nouveau/nv46: Change mc subdev oclass from nv44 to nv4c
- LP: #1542457
* ovl: allow zero size xattr
- LP: #1542457
* ovl: use a minimal buffer in ovl_copy_xattr
- LP: #1542457
* [media] vb2: fix a regression in poll() behavior for output,streams
- LP: #1542457
* [media] gspca: ov534/topro: prevent a division by 0
- LP: #1542457
* [media] media: dvb-core: Don't force CAN_INVERSION_AUTO in oneshot mode
- LP: #1542457
* tools lib traceevent: Fix output of %llu for 64 bit values read on 32
bit machines
- LP: #1542457
* KVM: x86: expose MSR_TSC_AUX to userspace
- LP: #1542457
* KVM: x86: correctly print #AC in traces
- LP: #1542457
* drm/radeon: call hpd_irq_event on resume
- LP: #1542457
* xhci: refuse loading if nousb is used
- LP: #1542457
* arm64: Clear out any singlestep state on a ptrace detach operation
- LP: #1542457
* time: Avoid signed overflow in timekeeping_get_ns()
- LP: #1542457
* ovl: root: copy attr
- LP: #1542457
* Bluetooth: Add support of Toshiba Broadcom based devices
- LP: #1522949, #1542457
* rtlwifi: fix memory leak for USB device
- LP: #1542457
* wlcore/wl12xx: spi: fix oops on firmware load
- LP: #1542457
* ovl: check dentry positiveness in ovl_cleanup_whiteouts()
- LP: #1542457
* EDAC, mc_sysfs: Fix freeing bus' name
- LP: #1542457
* EDAC: Robustify workqueues destruction
- LP: #1542457
* arm64: mm: ensure that the zero page is visible to the page table
walker
- LP: #1542457
* powerpc: Make value-returning atomics fully ordered
- LP: #1542457
* powerpc: Make {cmp}xchg* and their atomic_ versions fully ordered
- LP: #1542457
* dm space map metadata: remove unused variable in brb_pop()
- LP: #1542457
* dm thin: fix race condition when destroying thin pool workqueue
- LP: #1542457
* futex: Drop refcount if requeue_pi() acquired the rtmutex
- LP: #1542457
* arm64: mdscr_el1: avoid exposing DCC to userspace
- LP: #1542457
* arm64: kernel: enforce pmuserenr_el0 initialization and restore
- LP: #1542457
* drm/radeon: Fix off-by-one errors in radeon_vm_bo_set_addr
- LP: #1542457
* drm/radeon: clean up fujitsu quirks
- LP: #1542457
* mmc: sdio: Fix invalid vdd in voltage switch power cycle
- LP: #1542457
* mmc: sdhci: Fix DMA descriptor with zero data length
- LP: #1542457
* mmc: sdhci: Fix sdhci_runtime_pm_bus_on/off()
- LP: #1542457
* udf: limit the maximum number of indirect extents in a row
- LP: #1542457
* [media] rc: sunxi-cir: Initialize the spinlock properly
- LP: #1542457
* nfs: Fix race in __update_open_stateid()
- LP: #1542457
* USB: cp210x: add ID for ELV Marble Sound Board 1
- LP: #1542457
* NFSv4: Don't perform cached access checks before we've OPENed the file
- LP: #1542457
* NFS: Ensure we revalidate attributes before using execute_ok()
- LP: #1542457
* Thermal: initialize thermal zone device correctly
- LP: #1542457
* Thermal: handle thermal zone device properly during system sleep
- LP: #1542457
* Thermal: do thermal zone update after a cooling device registered
- LP: #1542457
* posix-clock: Fix return code on the poll method's error path
- LP: #1542457
* rtlwifi: rtl8723be: Fix module parameter initialization
- LP: #1542457
* rtlwifi: rtl8723ae: Fix initialization of module parameters
- LP: #1542457
* rtlwifi: rtl8821ae: Fix errors in parameter initialization
- LP: #1542457
* rtlwifi: rtl8188ee: Fix module parameter initialization
- LP: #1542457
* rtlwifi: rtl8192de: Fix incorrect module parameter descriptions
- LP: #1542457
* rtlwifi: rtl8192se: Fix module parameter initialization
- LP: #1542457
* rtlwifi: rtl8192ce: Fix handling of module parameters
- LP: #1542457
* rtlwifi: rtl8192cu: Add missing parameter setup
- LP: #1542457
* NFS: Fix attribute cache revalidation
- LP: #1542457
* rtlwifi: rtl_pci: Fix kernel panic
- LP: #1542457
* bcache: fix a livelock when we cause a huge number of cache misses
- LP: #1542457
* bcache: Add a cond_resched() call to gc
- LP: #1542457
* bcache: clear BCACHE_DEV_UNLINK_DONE flag when attaching a backing
device
- LP: #1542457
* bcache: fix a leak in bch_cached_dev_run()
- LP: #1542457
* bcache: unregister reboot notifier if bcache fails to unregister device
- LP: #1542457
* bcache: allows use of register in udev to avoid "device_busy" error.
- LP: #1542457
* bcache: Change refill_dirty() to always scan entire disk if necessary
- LP: #1542457
* wlcore/wl12xx: spi: fix NULL pointer dereference (Oops)
- LP: #1542457
* Input: i8042 - add Fujitsu Lifebook U745 to the nomux list
- LP: #1542457
* libxfs: pack the agfl header structure so XFS_AGFL_SIZE is correct
- LP: #1542457
* x86/xen: don't reset vcpu_info on a cancelled suspend
- LP: #1542457
* udf: Prevent buffer overrun with multi-byte characters
- LP: #1542457
* udf: Check output buffer length when converting name to CS0
- LP: #1542457
* drm/dp/mst: process broadcast messages correctly
- LP: #1542457
* drm/dp/mst: always send reply for UP request
- LP: #1542457
* drm/dp/mst: fix in MSTB RAD initialization
- LP: #1542457
* drm/dp/mst: fix in RAD element access
- LP: #1542457
* PCI: Fix minimum allocation address overwrite
- LP: #1542457
* PCI: host: Mark PCIe/PCI (MSI) IRQ cascade handlers as IRQF_NO_THREAD
- LP: #1542457
* iwlwifi: update and fix 7265 series PCI IDs
- LP: #1542457
* locks: fix unlock when fcntl_setlk races with a close
- LP: #1542457
* ASoC: compress: Fix compress device direction check
- LP: #1542457
* dm snapshot: fix hung bios when copy error occurs
- LP: #1542457
* uml: fix hostfs mknod()
- LP: #1542457
* uml: flush stdout before forking
- LP: #1542457
* drm/nouveau/kms: take mode_config mutex in connector hotplug path
- LP: #1542457
* ALSA: usb: Add native DSD support for Oppo HA-1
- LP: #1542457
* ALSA: hda - Fixup inverted internal mic for Lenovo E50-80
- LP: #1529624, #1542457
* x86/mm: Add barriers and document switch_mm()-vs-flush synchronization
- LP: #1542457
* x86/boot: Double BOOT_HEAP_SIZE to 64KB
- LP: #1542457
* s390: fix normalization bug in exception table sorting
- LP: #1542457
* xfs: inode recovery readahead can race with inode buffer creation
- LP: #1542457
* xfs: handle dquot buffer readahead in log recovery correctly
- LP: #1542457
* clocksource/drivers/vt8500: Increase the minimum delta
- LP: #1542457
* Input: elantech - mark protocols v2 and v3 as semi-mt
- LP: #1542457
* x86/reboot/quirks: Add iMac10,1 to pci_reboot_dmi_table[]
- LP: #1542457
* ALSA: seq: Fix missing NULL check at remove_events ioctl
- LP: #1542457
* ALSA: seq: Fix race at timer setup and close
- LP: #1542457
* virtio_balloon: fix race by fill and leak
- LP: #1542457
* virtio_balloon: fix race between migration and ballooning
- LP: #1542457
* parisc: Fix __ARCH_SI_PREAMBLE_SIZE
- LP: #1542457
* scripts/recordmcount.pl: support data in text section on powerpc
- LP: #1542457
* powerpc/module: Handle R_PPC64_ENTRY relocations
- LP: #1542457
* ALSA: hda - fix the headset mic detection problem for a Dell laptop
- LP: #1533461, #1542457
* ALSA: usb-audio: Fix mixer ctl regression of Native Instrument devices
- LP: #1542457
* drm/i915: intel_hpd_init(): Fix suspend/resume reprobing
- LP: #1542457
* x86/mm: Improve switch_mm() barrier comments
- LP: #1542457
* ALSA: timer: Fix double unlink of active_list
- LP: #1542457
* dmaengine: dw: fix cyclic transfer setup
- LP: #1542457
* dmaengine: dw: fix cyclic transfer callbacks
- LP: #1542457
* mmc: mmci: fix an ages old detection error
- LP: #1542457
* ALSA: timer: Fix race among timer ioctls
- LP: #1542457
* sparc64: fix incorrect sign extension in sys_sparc64_personality
- LP: #1542457
* cifs: Ratelimit kernel log messages
- LP: #1542457
* cifs: fix race between call_async() and reconnect()
- LP: #1542457
* cifs_dbg() outputs an uninitialized buffer in cifs_readdir()
- LP: #1542457
* m32r: fix m32104ut_defconfig build fail
- LP: #1542457
* dma-debug: switch check from _text to _stext
- LP: #1542457
* scripts/bloat-o-meter: fix python3 syntax error
- LP: #1542457
* ocfs2/dlm: ignore cleaning the migration mle that is inuse
- LP: #1542457
* ALSA: timer: Harden slave timer list handling
- LP: #1542457
* zram/zcomp: use GFP_NOIO to allocate streams
- LP: #1542457
* zram: try vmalloc() after kmalloc()
- LP: #1542457
* mm: soft-offline: check return value in second __get_any_page() call
- LP: #1542457
* memcg: only free spare array when readers are done
- LP: #1542457
* panic: release stale console lock to always get the logbuf printed out
- LP: #1542457
* kernel/panic.c: turn off locks debug before releasing console lock
- LP: #1542457
* printk: do cond_resched() between lines while outputting to consoles
- LP: #1542457
* ALSA: hda - Fix bass pin fixup for ASUS N550JX
- LP: #1542457
* crypto: af_alg - Disallow bind/setkey/... after accept(2)
- LP: #1542457
* crypto: af_alg - Fix socket double-free when accept fails
- LP: #1542457
* crypto: af_alg - Add nokey compatibility path
- LP: #1542457
* crypto: hash - Add crypto_ahash_has_setkey
- LP: #1542457
* crypto: af_alg - Allow af_af_alg_release_parent to be called on nokey
path
- LP: #1542457
* crypto: af_alg - Forbid bind(2) when nokey child sockets are present
- LP: #1542457
* ALSA: hrtimer: Fix stall by hrtimer_cancel()
- LP: #1542457
* ALSA: pcm: Fix snd_pcm_hw_params struct copy in compat mode
- LP: #1542457
* ALSA: seq: Fix snd_seq_call_port_info_ioctl in compat mode
- LP: #1542457
* ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0
- LP: #1542457
* ARM: debug-ll: fix BCM63xx entry for multiplatform
- LP: #1542457
* xfs: log mount failures don't wait for buffers to be released
- LP: #1542457
* crypto: algif_skcipher - Load TX SG list after waiting
- LP: #1542457
* crypto: crc32c - Fix crc32c soft dependency
- LP: #1542457
* IB/qib: fix mcast detach when qp not attached
- LP: #1542457
* IB/qib: Support creating qps with GFP_NOIO flag
- LP: #1542457
* ideapad-laptop: Add Lenovo ideapad Y700-17ISK to no_hw_rfkill dmi list
- LP: #1542457
* iscsi-target: Fix potential dead-lock during node acl delete
- LP: #1542457
* ALSA: hda - Flush the pending probe work at remove
- LP: #1542457
* ALSA: timer: Handle disconnection more safely
- LP: #1542457
* ocfs2: NFS hangs in __ocfs2_cluster_lock due to race with
ocfs2_unblock_lock
- LP: #1542457
* MAINTAINERS: return arch/sh to maintained state, with new maintainers
- LP: #1542457
* ideapad-laptop: Add Lenovo Yoga 700 to no_hw_rfkill dmi list
- LP: #1542457
* drm/i915: On fb alloc failure, unref gem object where it gets refed
- LP: #1542457
* [media] rc: allow rc modules to be loaded if rc-main is not a module
- LP: #1542457
* SCSI: initio: remove duplicate module device table
- LP: #1542457
* clk: xgene: Fix divider with non-zero shift value
- LP: #1542457
* clk: st: avoid uninitialized variable use
- LP: #1542457
* ASoC: Intel: pass correct parameter in sst_alloc_stream_mrfld()
- LP: #1542457
* ath9k_htc: check for underflow in ath9k_htc_rx_msg()
- LP: #1542457
* mtd: nand: fix ONFI parameter page layout
- LP: #1542457
* mtd: nand: denali: add missing nand_release() call in denali_remove()
- LP: #1542457
* ALSA: fm801: propagate TUNER_ONLY bit when autodetected
- LP: #1542457
* pinctrl: bcm2835: Fix memory leak in error path
- LP: #1542457
* mmc: sdhci: restore behavior when setting VDD via external regulator
- LP: #1542457
* x86/LDT: Print the real LDT base address
- LP: #1542457
* sysrq: Fix warning in sysrq generated crash.
- LP: #1542457
* kconfig: return 'false' instead of 'no' in bool function
- LP: #1542457
* perf/x86: Fix filter_events() bug with event mappings
- LP: #1542457
* power: test_power: correctly handle empty writes
- LP: #1542457
* firmware: actually return NULL on failed request_firmware_nowait()
- LP: #1542457
* target: Fix a memory leak in target_dev_lba_map_store()
- LP: #1542457
* m68k/atari, m68k/sun3: Fix SCSI platform device registration when
driver is modular
- LP: #1542457
* um: Fix build error and kconfig for i386
- LP: #1542457
* kbuild: Demote 'sign-compare' warning to W=2
- LP: #1542457
* mmc: sd: limit SD card power limit according to cards capabilities
- LP: #1542457
* net: tcp_memcontrol: properly detect ancestor socket pressure
- LP: #1542457
* vmstat: make vmstat_updater deferrable again and shut down on idle
- LP: #1542457
* Btrfs: clean up an error code in btrfs_init_space_info()
- LP: #1542457
* btrfs: initialize the seq counter in struct btrfs_device
- LP: #1542457
* printk: help pr_debug and pr_devel to optimize out arguments
- LP: #1542457
* ARM: dts: armadillo800eva Correct extal1 frequency to 24 MHz
- LP: #1542457
* mmc: debugfs: correct wrong voltage value
- LP: #1542457
* IB/mlx4: Initialize hop_limit when creating address handle
- LP: #1542457
* net/mlx4: Remove unused macro
- LP: #1542457
* veth: don’t modify ip_summed; doing so treats packets with bad
checksums as good.
- LP: #1542457
* net: cdc_ncm: avoid changing RX/TX buffers on MTU changes
- LP: #1542457
* sctp: sctp should release assoc when sctp_make_abort_user return NULL
in sctp_close
- LP: #1542457
* connector: bump skb->users before callback invocation
- LP: #1542457
* unix: properly account for FDs passed over unix sockets
- LP: #1542457
* bridge: Only call /sbin/bridge-stp for the initial network namespace
- LP: #1542457
* vxlan: fix test which detect duplicate vxlan iface
- LP: #1542457
* net: sctp: prevent writes to cookie_hmac_alg from accessing invalid
memory
- LP: #1542457
* tcp_yeah: don't set ssthresh below 2
- LP: #1542457
* udp: disallow UFO for sockets with SO_NO_CHECK option
- LP: #1542457
* net: preserve IP control block during GSO segmentation
- LP: #1542457
* bonding: Prevent IPv6 link local address on enslaved devices
- LP: #1542457
* phonet: properly unshare skbs in phonet_rcv()
- LP: #1542457
* net: bpf: reject invalid shifts
- LP: #1542457
* ipv6: update skb->csum when CE mark is propagated
- LP: #1542457
* bridge: fix lockdep addr_list_lock false positive splat
- LP: #1542457
* batman-adv: Avoid recursive call_rcu for batadv_bla_claim
- LP: #1542457
* batman-adv: Avoid recursive call_rcu for batadv_nc_node
- LP: #1542457
* batman-adv: Drop immediate batadv_orig_ifinfo free function
- LP: #1542457
* batman-adv: Drop immediate batadv_neigh_node free function
- LP: #1542457
* batman-adv: Drop immediate neigh_ifinfo free function
- LP: #1542457
* batman-adv: Drop immediate batadv_hard_iface free function
- LP: #1542457
* batman-adv: Drop immediate orig_node free function
- LP: #1542457
* team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill_vid
- LP: #1542457
* sctp: Prevent soft lockup when sctp_accept() is called during a timeout
event
- LP: #1542457
* xen-netback: respect user provided max_queues
- LP: #1542457
* xen-netfront: respect user provided max_queues
- LP: #1542457
* xen-netfront: update num_queues to real created
- LP: #1542457
* Linux 3.19.8-ckt14
- LP: #1542457
* x86/xen/p2m: hint at the last populated P2M entry
- LP: #1542941
* qeth: initialize net_device with carrier off
- LP: #1541907
* HID: i2c-hid: Prevent sending reports from racing with device reset
- LP: #1535513
* iio: adis_buffer: Fix out-of-bounds memory access
- LP: #1546183
* KVM: PPC: Fix emulation of H_SET_DABR/X on POWER8
- LP: #1546183
* KVM: PPC: Fix ONE_REG AltiVec support
- LP: #1546183
* x86/irq: Call chip->irq_set_affinity in proper context
- LP: #1546183
* ACPI: Revert "ACPI / video: Add Dell Inspiron 5737 to the blacklist"
- LP: #1546183
* ACPI / PCI / hotplug: unlock in error path in acpiphp_enable_slot()
- LP: #1546183
* usb: cdc-acm: handle unlinked urb in acm read callback
- LP: #1546183
* usb: cdc-acm: send zero packet for intel 7260 modem
- LP: #1546183
* cdc-acm:exclude Samsung phone 04e8:685d
- LP: #1546183
* usb: hub: do not clear BOS field during reset device
- LP: #1546183
* USB: cp210x: add ID for IAI USB to RS485 adaptor
- LP: #1546183
* USB: visor: fix null-deref at probe
- LP: #1546183
* USB: serial: visor: fix crash on detecting device without write_urbs
- LP: #1546183
* USB: serial: option: Adding support for Telit LE922
- LP: #1546183
* ALSA: seq: Fix incorrect sanity check at snd_seq_oss_synth_cleanup()
- LP: #1546183
* ALSA: seq: Degrade the error message for too many opens
- LP: #1546183
* USB: serial: ftdi_sio: add support for Yaesu SCU-18 cable
- LP: #1546183
* arm64: kernel: fix architected PMU registers unconditional access
- LP: #1546183
* USB: option: fix Cinterion AHxx enumeration
- LP: #1546183
* ALSA: compress: Disable GET_CODEC_CAPS ioctl for some architectures
- LP: #1546183
* ALSA: usb-audio: Fix TEAC UD-501/UD-503/NT-503 usb delay
- LP: #1546183
* ALSA: bebob: Use a signed return type for get_formation_index
- LP: #1546183
* arm64: errata: Add -mpc-relative-literal-loads to build flags
- LP: #1533009, #1546183
* arm64: mm: avoid calling apply_to_page_range on empty range
- LP: #1546183
* x86/mm: Fix types used in pgprot cacheability flags translations
- LP: #1546183
* powerpc/eeh: Fix PE location code
- LP: #1546183
* SCSI: fix crashes in sd and sr runtime PM
- LP: #1546183
* tty: Fix unsafe ldisc reference via ioctl(TIOCGETD)
- LP: #1546183
* n_tty: Fix unsafe reference to "other" ldisc
- LP: #1546183
* staging/speakup: Use tty_ldisc_ref() for paste kworker
- LP: #1546183
* irqchip/atmel-aic: Fix wrong bit operation for IRQ priority
- LP: #1546183
* seccomp: always propagate NO_NEW_PRIVS on tsync
- LP: #1546183
* ALSA: dummy: Disable switching timer backend via sysfs
- LP: #1546183
* drm/vmwgfx: respect 'nomodeset'
- LP: #1546183
* Staging: speakup: Fix getting port information
- LP: #1546183
* x86/mm/pat: Avoid truncation when converting cpa->numpages to address
- LP: #1546183
* serial: 8250_pci: Add Intel Broadwell ports
- LP: #1546183
* perf annotate browser: Fix behaviour of Shift-Tab with nothing focussed
- LP: #1546183
* perf hists: Fix HISTC_MEM_DCACHELINE width setting
- LP: #1546183
* powerpc/perf: Remove PPMU_HAS_SSLOT flag for Power8
- LP: #1546183
* [media] usbvision fix overflow of interfaces array
- LP: #1546183
* [media] usbvision: fix leak of usb_dev on failure paths in
usbvision_probe()
- LP: #1546183
* [media] usbvision: fix crash on detecting device with invalid
configuration
- LP: #1546183
* ASN.1: Fix non-match detection failure on data overrun
- LP: #1546183
* Linux 3.19.8-ckt15
- LP: #1546183
* netfilter: bridge: don't use nf_bridge_info data to store mac header
- LP: #1463911
* netfilter: bridge: restore vlan tag when refragmenting
- LP: #1463911
* netfilter: bridge: forward IPv6 fragmented packets
- LP: #1463911
* netfilter: bridge: Use __in6_dev_get rather than in6_dev_get in
br_validate_ipv6
- LP: #1463911
* mwifiex: remove USB8897 chipset support
- LP: #1494593
* ALSA: usb-audio: avoid freeing umidi object twice
- LP: #1546177
- CVE-2016-2384
* vmstat: explicitly schedule per-cpu work on the CPU we need it to run
on
- LP: #1546320
-- Brad Figg <brad.figg@xxxxxxxxxxxxx> Thu, 10 Mar 2016 14:11:41 -0800
** Changed in: linux (Ubuntu Vivid)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1542941
Title:
Regression: problems migrating recent wily/vivid Xen VMs due to memory
hotplug fix
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Vivid:
Fix Released
Status in linux source package in Wily:
Fix Released
Bug description:
Commit 633d6f17cd91ad5bf2370265946f716e42d388c6 (aka
38d30afb12140c0e3a446fe779dc9cd29548f313 in vivid) in Xen domU causes
high resource requirements in the underlying target dom0 (migrating a
64-bit domU involves a 1GB malloc in dom0, as well as a lot of
unnecessary work).
In my specific case, that 1GB malloc fails as my dom0s aren't big
enough, causing all migrations to fail with the migrating VM
suspended.
This is fixed in
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=98dd166ea3a3c3b57919e20d9b0d1237fcd0349d
:
"""
x86/xen/p2m: hint at the last populated P2M entry"
With commit 633d6f17cd91ad5bf2370265946f716e42d388c6 (x86/xen: prepare
p2m list for memory hotplug) the P2M may be sized to accomdate a much
larger amount of memory than the domain currently has.
When saving a domain, the toolstack must scan all the P2M looking for
populated pages. This results in a performance regression due to the
unnecessary scanning.
Instead of reporting (via shared_info) the maximum possible size of
the P2M, hint at the last PFN which might be populated. This hint is
increased as new leaves are added to the P2M (in the expectation that
they will be used for populated entries).
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 4.0+
"""
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References
