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  1. 20 1月, 2020 1 次提交
  3. 30 10月, 2019 1 次提交
  5. 12 9月, 2019 1 次提交
  7. 16 8月, 2019 3 次提交
  9. 15 8月, 2019 1 次提交
  11. 15 7月, 2019 1 次提交
    • P
      migration: Split log_clear() into smaller chunks · 002cad6b
      由 Peter Xu 提交于 
      Currently we are doing log_clear() right after log_sync() which mostly
keeps the old behavior when log_clear() was still part of log_sync().

This patch tries to further optimize the migration log_clear() code
path to split huge log_clear()s into smaller chunks.

We do this by spliting the whole guest memory region into memory
chunks, whose size is decided by MigrationState.clear_bitmap_shift (an
example will be given below).  With that, we don't do the dirty bitmap
clear operation on the remote node (e.g., KVM) when we fetch the dirty
bitmap, instead we explicitly clear the dirty bitmap for the memory
chunk for each of the first time we send a page in that chunk.

Here comes an example.

Assuming the guest has 64G memory, then before this patch the KVM
ioctl KVM_CLEAR_DIRTY_LOG will be a single one covering 64G memory.
If after the patch, let's assume when the clear bitmap shift is 18,
then the memory chunk size on x86_64 will be 1UL<<18 * 4K = 1GB.  Then
instead of sending a big 64G ioctl, we'll send 64 small ioctls, each
of the ioctl will cover 1G of the guest memory.  For each of the 64
small ioctls, we'll only send if any of the page in that small chunk
was going to be sent right away.
Signed-off-by: NPeter Xu <peterx@redhat.com>
Reviewed-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190603065056.25211-12-peterx@redhat.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>
      002cad6b
  13. 12 6月, 2019 1 次提交
    • M
      Include qemu-common.h exactly where needed · a8d25326
      由 Markus Armbruster 提交于 
      No header includes qemu-common.h after this commit, as prescribed by
qemu-common.h's file comment.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Message-Id: <20190523143508.25387-5-armbru@redhat.com>
[Rebased with conflicts resolved automatically, except for
include/hw/arm/xlnx-zynqmp.h hw/arm/nrf51_soc.c hw/arm/msf2-soc.c
block/qcow2-refcount.c block/qcow2-cluster.c block/qcow2-cache.c
target/arm/cpu.h target/lm32/cpu.h target/m68k/cpu.h target/mips/cpu.h
target/moxie/cpu.h target/nios2/cpu.h target/openrisc/cpu.h
target/riscv/cpu.h target/tilegx/cpu.h target/tricore/cpu.h
target/unicore32/cpu.h target/xtensa/cpu.h; bsd-user/main.c and
net/tap-bsd.c fixed up]
      a8d25326
  15. 15 5月, 2019 1 次提交
  17. 02 4月, 2019 1 次提交
    • M
      Revert "migration: move only_migratable to MigrationState" · 811f8652
      由 Markus Armbruster 提交于 
      This reverts commit 3df663e5.
This reverts commit b605c47b.

Command line option --only-migratable is for disallowing any
configuration that can block migration.

Initially, --only-migratable set global variable @only_migratable.

Commit 3df663e5 "migration: move only_migratable to MigrationState"
replaced it by MigrationState member @only_migratable.  That was a
mistake.

First, it doesn't make sense on the design level.  MigrationState
captures the state of an individual migration, but --only-migratable
isn't a property of an individual migration, it's a restriction on
QEMU configuration.  With fault tolerance, we could have several
migrations at once.  --only-migratable would certainly protect all of
them.  Storing it in MigrationState feels inappropriate.

Second, it contributes to a dependency cycle that manifests itself as
a bug now.

Putting @only_migratable into MigrationState means its available only
after migration_object_init().

We can't set it before migration_object_init(), so we delay setting it
with a global property (this is fixup commit b605c47b "migration:
fix handling for --only-migratable").

We can't get it before migration_object_init(), so anything that uses
it can only run afterwards.

Since migrate_add_blocker() needs to obey --only-migratable, any code
adding migration blockers can run only afterwards.  This contributes
to the following dependency cycle:

* configure_blockdev() must run before machine_set_property()
  so machine properties can refer to block backends

* machine_set_property() before configure_accelerator()
  so machine properties like kvm-irqchip get applied

* configure_accelerator() before migration_object_init()
  so that Xen's accelerator compat properties get applied.

* migration_object_init() before configure_blockdev()
  so configure_blockdev() can add migration blockers

The cycle was closed when recent commit cda4aa9a "Create block
backends before setting machine properties" added the first
dependency, and satisfied it by violating the last one.  Broke block
backends that add migration blockers.

Moving @only_migratable into MigrationState was a mistake.  Revert it.

This doesn't quite break the "migration_object_init() before
configure_blockdev() dependency, since migrate_add_blocker() still has
another dependency on migration_object_init().  To be addressed the
next commit.

Note that the reverted commit made -only-migratable sugar for -global
migration.only-migratable=on below the hood.  Documentation has only
ever mentioned -only-migratable.  This commit removes the arcane &
undocumented alternative to -only-migratable again.  Nobody should be
using it.

Conflicts:
	include/migration/misc.h
	migration/migration.c
	migration/migration.h
	vl.c
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Message-Id: <20190401090827.20793-3-armbru@redhat.com>
Reviewed-by: NIgor Mammedov <imammedo@redhat.com>
      811f8652
  19. 26 3月, 2019 1 次提交
  21. 06 3月, 2019 3 次提交
  23. 05 3月, 2019 1 次提交
  25. 23 1月, 2019 2 次提交
  27. 31 10月, 2018 1 次提交
  29. 22 8月, 2018 2 次提交
  31. 15 6月, 2018 2 次提交
  33. 04 6月, 2018 1 次提交
  35. 16 5月, 2018 10 次提交
  37. 26 4月, 2018 3 次提交
  39. 20 3月, 2018 2 次提交
  41. 14 3月, 2018 1 次提交