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migration: Deprecate old compression method

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Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231018115513.2163-6-quintela@redhat.com>
This commit is contained in:
Juan Quintela
2023-10-18 13:55:13 +02:00
parent 66db46ca83
commit 864128df46
3 changed files with 64 additions and 20 deletions
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8
docs/about/deprecated.rst
View File

@@ -496,3 +496,11 @@ devices or none.
Please see "QMP invocation for live storage migration with
``blockdev-mirror`` + NBD" in docs/interop/live-block-operations.rst
for a detailed explanation.
old compression method (since 8.2)
''''''''''''''''''''''''''''''''''
Compression method fails too much. Too many races. We are going to
remove it if nobody fixes it. For starters, migration-test
compression tests are disabled becase they fail randomly. If you need
compression, use multifd compression methods.

13
migration/options.c
View File

@@ -483,6 +483,11 @@ bool migrate_caps_check(bool *old_caps, bool *new_caps, Error **errp)
" use blockdev-mirror with NBD instead");
}
if (new_caps[MIGRATION_CAPABILITY_COMPRESS]) {
warn_report("old compression method is deprecated;"
" use multifd compression methods instead");
}
#ifndef CONFIG_REPLICATION
if (new_caps[MIGRATION_CAPABILITY_X_COLO]) {
error_setg(errp, "QEMU compiled without replication module"
@@ -1335,18 +1340,26 @@ static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
/* TODO use QAPI_CLONE() instead of duplicating it inline */
if (params->has_compress_level) {
warn_report("old compression is deprecated;"
" use multifd compression methods instead");
s->parameters.compress_level = params->compress_level;
}
if (params->has_compress_threads) {
warn_report("old compression is deprecated;"
" use multifd compression methods instead");
s->parameters.compress_threads = params->compress_threads;
}
if (params->has_compress_wait_thread) {
warn_report("old compression is deprecated;"
" use multifd compression methods instead");
s->parameters.compress_wait_thread = params->compress_wait_thread;
}
if (params->has_decompress_threads) {
warn_report("old compression is deprecated;"
" use multifd compression methods instead");
s->parameters.decompress_threads = params->decompress_threads;
}

63
qapi/migration.json
View File

@@ -272,6 +272,10 @@
# Features:
#
# @deprecated: Member @disk is deprecated because block migration is.
# Member @compression is deprecated because it is unreliable and
# untested. It is recommended to use multifd migration, which
# offers an alternative compression implementation that is
# reliable and tested.
#
# Since: 0.14
##
@@ -289,7 +293,7 @@
'*blocked-reasons': ['str'],
'*postcopy-blocktime': 'uint32',
'*postcopy-vcpu-blocktime': ['uint32'],
'*compression': 'CompressionStats',
'*compression': { 'type': 'CompressionStats', 'features': [ 'deprecated' ] },
'*socket-address': ['SocketAddress'],
'*dirty-limit-throttle-time-per-round': 'uint64',
'*dirty-limit-ring-full-time': 'uint64'} }
@@ -530,7 +534,10 @@
# Features:
#
# @deprecated: Member @block is deprecated. Use blockdev-mirror with
# NBD instead.
# NBD instead. Member @compression is deprecated because it is
# unreliable and untested. It is recommended to use multifd
# migration, which offers an alternative compression
# implementation that is reliable and tested.
#
# @unstable: Members @x-colo and @x-ignore-shared are experimental.
#
@@ -538,7 +545,8 @@
##
{ 'enum': 'MigrationCapability',
'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
'compress', 'events', 'postcopy-ram',
{ 'name': 'compress', 'features': [ 'deprecated' ] },
'events', 'postcopy-ram',
{ 'name': 'x-colo', 'features': [ 'unstable' ] },
'release-ram',
{ 'name': 'block', 'features': [ 'deprecated' ] },
@@ -844,7 +852,9 @@
# Features:
#
# @deprecated: Member @block-incremental is deprecated. Use
# blockdev-mirror with NBD instead.
# blockdev-mirror with NBD instead. Members @compress-level,
# @compress-threads, @decompress-threads and @compress-wait-thread
# are deprecated because @compression is deprecated.
#
# @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
# are experimental.
@@ -854,8 +864,11 @@
{ 'enum': 'MigrationParameter',
'data': ['announce-initial', 'announce-max',
'announce-rounds', 'announce-step',
'compress-level', 'compress-threads', 'decompress-threads',
'compress-wait-thread', 'throttle-trigger-threshold',
{ 'name': 'compress-level', 'features': [ 'deprecated' ] },
{ 'name': 'compress-threads', 'features': [ 'deprecated' ] },
{ 'name': 'decompress-threads', 'features': [ 'deprecated' ] },
{ 'name': 'compress-wait-thread', 'features': [ 'deprecated' ] },
'throttle-trigger-threshold',
'cpu-throttle-initial', 'cpu-throttle-increment',
'cpu-throttle-tailslow',
'tls-creds', 'tls-hostname', 'tls-authz', 'max-bandwidth',
@@ -1023,7 +1036,9 @@
# Features:
#
# @deprecated: Member @block-incremental is deprecated. Use
# blockdev-mirror with NBD instead.
# blockdev-mirror with NBD instead. Members @compress-level,
# @compress-threads, @decompress-threads and @compress-wait-thread
# are deprecated because @compression is deprecated.
#
# @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
# are experimental.
@@ -1038,10 +1053,14 @@
'*announce-max': 'size',
'*announce-rounds': 'size',
'*announce-step': 'size',
'*compress-level': 'uint8',
'*compress-threads': 'uint8',
'*compress-wait-thread': 'bool',
'*decompress-threads': 'uint8',
'*compress-level': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*compress-threads': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*compress-wait-thread': { 'type': 'bool',
'features': [ 'deprecated' ] },
'*decompress-threads': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*throttle-trigger-threshold': 'uint8',
'*cpu-throttle-initial': 'uint8',
'*cpu-throttle-increment': 'uint8',
@@ -1078,7 +1097,7 @@
# Example:
#
# -> { "execute": "migrate-set-parameters" ,
# "arguments": { "compress-level": 1 } }
# "arguments": { "multifd-channels": 5 } }
# <- { "return": {} }
##
{ 'command': 'migrate-set-parameters', 'boxed': true,
@@ -1241,7 +1260,9 @@
# Features:
#
# @deprecated: Member @block-incremental is deprecated. Use
# blockdev-mirror with NBD instead.
# blockdev-mirror with NBD instead. Members @compress-level,
# @compress-threads, @decompress-threads and @compress-wait-thread
# are deprecated because @compression is deprecated.
#
# @unstable: Members @x-checkpoint-delay and @x-vcpu-dirty-limit-period
# are experimental.
@@ -1253,10 +1274,14 @@
'*announce-max': 'size',
'*announce-rounds': 'size',
'*announce-step': 'size',
'*compress-level': 'uint8',
'*compress-threads': 'uint8',
'*compress-wait-thread': 'bool',
'*decompress-threads': 'uint8',
'*compress-level': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*compress-threads': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*compress-wait-thread': { 'type': 'bool',
'features': [ 'deprecated' ] },
'*decompress-threads': { 'type': 'uint8',
'features': [ 'deprecated' ] },
'*throttle-trigger-threshold': 'uint8',
'*cpu-throttle-initial': 'uint8',
'*cpu-throttle-increment': 'uint8',
@@ -1296,10 +1321,8 @@
#
# -> { "execute": "query-migrate-parameters" }
# <- { "return": {
# "decompress-threads": 2,
# "multifd-channels": 2,
# "cpu-throttle-increment": 10,
# "compress-threads": 8,
# "compress-level": 1,
# "cpu-throttle-initial": 20,
# "max-bandwidth": 33554432,
# "downtime-limit": 300