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[Qemu-devel] [PATCH v8 2/6] migration: use bitmap_mutex in migration_bit
From: |
Wei Wang |
Subject: |
[Qemu-devel] [PATCH v8 2/6] migration: use bitmap_mutex in migration_bitmap_clear_dirty |
Date: |
Fri, 8 Jun 2018 16:10:39 +0800 |
The bitmap mutex is used to synchronize threads to update the dirty
bitmap and the migration_dirty_pages counter. For example, the free
page optimization clears bits of free pages from the bitmap in an
iothread context. This patch makes migration_bitmap_clear_dirty update
the bitmap and counter under the mutex.
Signed-off-by: Wei Wang <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
CC: Peter Xu <address@hidden>
---
migration/ram.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/migration/ram.c b/migration/ram.c
index c53e836..2eabbe9 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1093,11 +1093,14 @@ static inline bool
migration_bitmap_clear_dirty(RAMState *rs,
{
bool ret;
+ qemu_mutex_lock(&rs->bitmap_mutex);
ret = test_and_clear_bit(page, rb->bmap);
if (ret) {
rs->migration_dirty_pages--;
}
+ qemu_mutex_unlock(&rs->bitmap_mutex);
+
return ret;
}
--
1.8.3.1
[Qemu-devel] [PATCH v8 5/6] migration: move migrate_postcopy() to include/migration/misc.h, Wei Wang, 2018/06/08