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memory: Introduce log_sync_global() to memory listener

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Some of the memory listener may want to do log synchronization without
being able to specify a range of memory to sync but always globally.
Such a memory listener should provide this new method instead of the
log_sync() method.

Obviously we can also achieve similar thing when we put the global
sync logic into a log_sync() handler. However that's not efficient
enough because otherwise memory_global_dirty_log_sync() may do the
global sync N times, where N is the number of flat ranges in the
address space.

Make this new method be exclusive to log_sync().

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210506160549.130416-2-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2021-05-06 12:05:40 -04:00 • committed by Paolo Bonzini
parent 70cbae429e
commit b87eaa9b82
2 changed files with 35 additions and 10 deletions
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12
include/exec/memory.h
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@ -616,6 +616,18 @@ struct MemoryListener {
*/
void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);
/**
* @log_sync_global:
*
* This is the global version of @log_sync when the listener does
* not have a way to synchronize the log with finer granularity.
* When the listener registers with @log_sync_global defined, then
* its @log_sync must be NULL. Vice versa.
*
* @listener: The #MemoryListener.
*/
void (*log_sync_global)(MemoryListener *listener);
/**
* @log_clear:
*