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[Qemu-devel] [v6 11/14] migration: Add interface to control compression
From: |
Liang Li |
Subject: |
[Qemu-devel] [v6 11/14] migration: Add interface to control compression |
Date: |
Mon, 23 Mar 2015 16:32:26 +0800 |
The multiple compression threads can be turned on/off through
qmp and hmp interface before doing live migration.
Signed-off-by: Liang Li <address@hidden>
Signed-off-by: Yang Zhang <address@hidden>
Reviewed-by: Dr.David Alan Gilbert <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
---
migration/migration.c | 7 +++++--
qapi-schema.json | 11 ++++++++++-
2 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index 19409e6..dc7db87 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -611,8 +611,11 @@ bool migrate_zero_blocks(void)
bool migrate_use_compression(void)
{
- /* Disable compression before the patch series are applied */
- return false;
+ MigrationState *s;
+
+ s = migrate_get_current();
+
+ return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
}
int migrate_compress_level(void)
diff --git a/qapi-schema.json b/qapi-schema.json
index ac9594d..b117008 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -515,13 +515,22 @@
# to enable the capability on the source VM. The feature is disabled
by
# default. (since 1.6)
#
+# @compress: Use multiple compression threads to accelerate live migration.
+# This feature can help to reduce the migration traffic, by sending
+# compressed pages. Please note that if compress and xbzrle are both
+# on, compress only takes effect in the ram bulk stage, after that,
+# it will be disabled and only xbzrle takes effect, this can help to
+# minimize migration traffic. The feature is disabled by default.
+# (since 2.3)
+#
# @auto-converge: If enabled, QEMU will automatically throttle down the guest
# to speed up convergence of RAM migration. (since 1.6)
#
# Since: 1.2
##
{ 'enum': 'MigrationCapability',
- 'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks'] }
+ 'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
+ 'compress'] }
##
# @MigrationCapabilityStatus
--
1.9.1
- [Qemu-devel] [PATCH v6 0/14] migration: Add a new feature to do live migration, Liang Li, 2015/03/23
- [Qemu-devel] [v6 08/14] migration: Add the core code of multi-thread compression, Liang Li, 2015/03/23
- [Qemu-devel] [v6 03/14] migration: Add the framework of multi-thread decompression, Liang Li, 2015/03/23
- [Qemu-devel] [v6 11/14] migration: Add interface to control compression,
Liang Li <=
- [Qemu-devel] [v6 04/14] qemu-file: Add compression functions to QEMUFile, Liang Li, 2015/03/23
- [Qemu-devel] [v6 13/14] migration: Add qmp commands to set and query parameters, Liang Li, 2015/03/23
- [Qemu-devel] [v6 10/14] migration: Add the core code for decompression, Liang Li, 2015/03/23
- [Qemu-devel] [v6 09/14] migration: Make compression co-work with xbzrle, Liang Li, 2015/03/23
- [Qemu-devel] [v6 14/14] migration: Add hmp interface to set and query parameters, Liang Li, 2015/03/23
- [Qemu-devel] [v6 06/14] arch_init: Add and free data struct for decompression, Liang Li, 2015/03/23
- [Qemu-devel] [v6 05/14] arch_init: Alloc and free data struct for compression, Liang Li, 2015/03/23
- [Qemu-devel] [v6 07/14] migration: Split save_zero_page from ram_save_page, Liang Li, 2015/03/23