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X-Received-From: 209.132.183.28 Cc: Orit Wasserman , Benoit Hudzia , Aidan Shribman , Petter Svard Subject: [Qemu-devel] [PATCH 20/22] Add migrate_set_cachesize command X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Orit Wasserman Change XBZRLE cache size in bytes (the size should be a power of 2, it will be rounded down to the nearest power of 2). If XBZRLE cache size is too small there will be many cache miss. Signed-off-by: Benoit Hudzia Signed-off-by: Petter Svard Signed-off-by: Aidan Shribman Signed-off-by: Orit Wasserman Signed-off-by: Juan Quintela --- arch_init.c | 10 ++++++++++ hmp-commands.hx | 20 ++++++++++++++++++++ hmp.c | 13 +++++++++++++ hmp.h | 1 + migration.c | 14 ++++++++++++++ migration.h | 2 ++ qapi-schema.json | 16 ++++++++++++++++ qmp-commands.hx | 23 +++++++++++++++++++++++ 8 files changed, 99 insertions(+) diff --git a/arch_init.c b/arch_init.c index a3a4707..d972d84 100644 --- a/arch_init.c +++ b/arch_init.c @@ -192,6 +192,16 @@ static struct { .cache = NULL, }; + +int64_t xbzrle_cache_resize(int64_t new_size) +{ + if (XBZRLE.cache != NULL) { + return cache_resize(XBZRLE.cache, new_size / TARGET_PAGE_SIZE) * + TARGET_PAGE_SIZE; + } + return pow2floor(new_size); +} + static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset, int cont, int flag) { diff --git a/hmp-commands.hx b/hmp-commands.hx index 9245bef..052a0a3 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -829,6 +829,26 @@ STEXI @item migrate_cancel @findex migrate_cancel Cancel the current VM migration. + +ETEXI + + { + .name = "migrate_set_cachesize", + .args_type = "value:o", + .params = "value", + .help = "set cache size (in bytes) for XBZRLE migrations," + "the cache size will be rounded down to the nearest " + "power of 2.\n" + "The cache size effects the number of cache misses." + "In case of a high cache miss ratio you need to increase" + " the cache size", + .mhandler.cmd = hmp_migrate_set_cachesize, + }, + +STEXI +@item migrate_set_cachesize @var{value} +@findex migrate_set_cachesize +Set cache size to @var{value} (in bytes) for xbzrle migrations. ETEXI { diff --git a/hmp.c b/hmp.c index b0440e6..99ad00a 100644 --- a/hmp.c +++ b/hmp.c @@ -758,6 +758,19 @@ void hmp_migrate_set_downtime(Monitor *mon, const QDict *qdict) qmp_migrate_set_downtime(value, NULL); } +void hmp_migrate_set_cachesize(Monitor *mon, const QDict *qdict) +{ + int64_t value = qdict_get_int(qdict, "value"); + Error *err = NULL; + + qmp_migrate_set_cache_size(value, &err); + if (err) { + monitor_printf(mon, "%s\n", error_get_pretty(err)); + error_free(err); + return; + } +} + void hmp_migrate_set_speed(Monitor *mon, const QDict *qdict) { int64_t value = qdict_get_int(qdict, "value"); diff --git a/hmp.h b/hmp.h index 09ba198..7c5117d 100644 --- a/hmp.h +++ b/hmp.h @@ -53,6 +53,7 @@ void hmp_migrate_cancel(Monitor *mon, const QDict *qdict); void hmp_migrate_set_downtime(Monitor *mon, const QDict *qdict); void hmp_migrate_set_speed(Monitor *mon, const QDict *qdict); void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict); +void hmp_migrate_set_cachesize(Monitor *mon, const QDict *qdict); void hmp_set_password(Monitor *mon, const QDict *qdict); void hmp_expire_password(Monitor *mon, const QDict *qdict); void hmp_eject(Monitor *mon, const QDict *qdict); diff --git a/migration.c b/migration.c index 1a264a9..d134bf6 100644 --- a/migration.c +++ b/migration.c @@ -533,6 +533,20 @@ void qmp_migrate_cancel(Error **errp) migrate_fd_cancel(migrate_get_current()); } +void qmp_migrate_set_cache_size(int64_t value, Error **errp) +{ + MigrationState *s = migrate_get_current(); + + /* Check for truncation */ + if (value != (size_t)value) { + error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", + "exceeding address space"); + return; + } + + s->xbzrle_cache_size = xbzrle_cache_resize(value); +} + void qmp_migrate_set_speed(int64_t value, Error **errp) { MigrationState *s; diff --git a/migration.h b/migration.h index cdf6787..337e225 100644 --- a/migration.h +++ b/migration.h @@ -108,4 +108,6 @@ int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen); int migrate_use_xbzrle(void); int64_t migrate_xbzrle_cache_size(void); +int64_t xbzrle_cache_resize(int64_t new_size); + #endif diff --git a/qapi-schema.json b/qapi-schema.json index a8408fd..a0f0f95 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -1390,6 +1390,22 @@ { 'command': 'migrate_set_speed', 'data': {'value': 'int'} } ## +# @migrate-set-cache-size +# +# Set XBZRLE cache size +# +# @value: cache size in bytes +# +# The size will be rounded down to the nearest power of 2. +# The cache size can be modified before and during ongoing migration +# +# Returns: nothing on success +# +# Since: 1.2 +## +{ 'command': 'migrate-set-cache-size', 'data': {'value': 'int'} } + +## # @ObjectPropertyInfo: # # @name: the name of the property diff --git a/qmp-commands.hx b/qmp-commands.hx index 3ee6e00..a3d57ce 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -520,6 +520,29 @@ Example: <- { "return": {} } EQMP +{ + .name = "migrate-set-cache-size", + .args_type = "value:o", + .mhandler.cmd_new = qmp_marshal_input_migrate_set_cache_size, + }, + +SQMP +migrate-set-cache-size +--------------------- + +Set cache size to be used by XBZRLE migration, the cache size will be rounded +down to the nearest power of 2 + +Arguments: + +- "value": cache size in bytes (json-int) + +Example: + +-> { "execute": "migrate-set-cache-size", "arguments": { "value": 536870912 } } +<- { "return": {} } + +EQMP { .name = "migrate_set_speed",