motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-30 05:21:55 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

migration: Dynamic cpu throttling for auto-converge

Browse source 
Remove traditional auto-converge static 30ms throttling code and replace it
with a dynamic throttling algorithm.

Additionally, be more aggressive when deciding when to start throttling.
Previously we waited until four unproductive memory passes. Now we begin
throttling after only two unproductive memory passes. Four seemed quite
arbitrary and only waiting for two passes allows us to complete the migration
faster.

Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Jason J. Herne 2015-09-08 13:12:35 -04:00 • committed by Juan Quintela
parent 1626fee3bd
commit 070afca258
2 changed files with 34 additions and 59 deletions
Download patch file Download diff file Expand all files Collapse all files

4
migration/migration.c
View file

@ -29,6 +29,7 @@
#include "trace.h"
#include "qapi/util.h"
#include "qapi-event.h"
#include "qom/cpu.h"
#define MAX_THROTTLE (32 << 20) /* Migration speed throttling */
@ -1070,6 +1071,9 @@ static void *migration_thread(void *opaque)
}
}
/* If we enabled cpu throttling for auto-converge, turn it off. */
cpu_throttle_stop();
qemu_mutex_lock_iothread();
if (s->state == MIGRATION_STATUS_COMPLETED) {
int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);