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migration: Support periodic RAMBlock dirty bitmap sync

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When VM is configured with huge memory, the current throttle logic
doesn't look like to scale, because migration_trigger_throttle()
is only called for each iteration, so it won't be invoked for a long
time if one iteration can take a long time.

The periodic dirty sync aims to fix the above issue by synchronizing
the ramblock from remote dirty bitmap and, when necessary, triggering
the CPU throttle multiple times during a long iteration.

This is a trade-off between synchronization overhead and CPU throttle
impact.

Signed-off-by: Hyman Huang <yong.huang@smartx.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/f61f1b3653f2acf026901103e1c73d157d38b08f.1729146786.git.yong.huang@smartx.com
[peterx: make prev_cnt global, and reset for each migration]
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Hyman Huang 2024-10-17 14:42:54 +08:00 • committed by Peter Xu
parent 6a39ba7cab
commit 52ac968ab2
6 changed files with 98 additions and 4 deletions
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14
include/sysemu/cpu-throttle.h
View file

@ -65,4 +65,18 @@ bool cpu_throttle_active(void);
*/
int cpu_throttle_get_percentage(void);
/**
* cpu_throttle_dirty_sync_timer_tick:
*
* Dirty sync timer hook.
*/
void cpu_throttle_dirty_sync_timer_tick(void *opaque);
/**
* cpu_throttle_dirty_sync_timer:
*
* Start or stop the dirty sync timer.
*/
void cpu_throttle_dirty_sync_timer(bool enable);
#endif /* SYSEMU_CPU_THROTTLE_H */