[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 28/34] memory: introduce memory_region_test_and_clea
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PATCH 28/34] memory: introduce memory_region_test_and_clear_dirty |
Date: |
Wed, 19 Dec 2012 13:33:51 +0100 |
This function avoids having to do two calls, one to test the dirty bit, and
other to reset it.
Signed-off-by: Juan Quintela <address@hidden>
---
memory.c | 16 ++++++++++++++++
memory.h | 16 ++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/memory.c b/memory.c
index 7419853..c72a5e2 100644
--- a/memory.c
+++ b/memory.c
@@ -1081,6 +1081,22 @@ void memory_region_set_dirty(MemoryRegion *mr, hwaddr
addr,
return cpu_physical_memory_set_dirty_range(mr->ram_addr + addr, size, -1);
}
+bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
+ hwaddr size, unsigned client)
+{
+ bool ret;
+ assert(mr->terminates);
+ ret = cpu_physical_memory_get_dirty(mr->ram_addr + addr, size,
+ 1 << client);
+ if (ret) {
+ cpu_physical_memory_reset_dirty(mr->ram_addr + addr,
+ mr->ram_addr + addr + size,
+ 1 << client);
+ }
+ return ret;
+}
+
+
void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
{
AddressSpace *as;
diff --git a/memory.h b/memory.h
index 9462bfd..bc63a87 100644
--- a/memory.h
+++ b/memory.h
@@ -454,6 +454,22 @@ void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
hwaddr size);
/**
+ * memory_region_test_and_clear_dirty: Check whether a range of bytes is dirty
+ * for a specified client. It clears them.
+ *
+ * Checks whether a range of bytes has been written to since the last
+ * call to memory_region_reset_dirty() with the same @client. Dirty logging
+ * must be enabled.
+ *
+ * @mr: the memory region being queried.
+ * @addr: the address (relative to the start of the region) being queried.
+ * @size: the size of the range being queried.
+ * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
+ * %DIRTY_MEMORY_VGA.
+ */
+bool memory_region_test_and_clear_dirty(MemoryRegion *mr, hwaddr addr,
+ hwaddr size, unsigned client);
+/**
* memory_region_sync_dirty_bitmap: Synchronize a region's dirty bitmap with
* any external TLBs (e.g. kvm)
*
--
1.7.11.7
- [Qemu-devel] [PATCH 27/34] ram: Add last_sent_block, (continued)
- [Qemu-devel] [PATCH 27/34] ram: Add last_sent_block, Juan Quintela, 2012/12/19
- [Qemu-devel] [PATCH 31/34] ram: account the amount of transferred ram better, Juan Quintela, 2012/12/19
- [Qemu-devel] [PATCH 32/34] ram: refactor ram_save_block() return value, Juan Quintela, 2012/12/19
- [Qemu-devel] [PATCH 33/34] migration: fix qemu_get_fd for BufferedFile, Juan Quintela, 2012/12/19
- [Qemu-devel] [PATCH 29/34] ram: Use memory_region_test_and_clear_dirty, Juan Quintela, 2012/12/19
- [Qemu-devel] [PATCH 34/34] migration: merge QEMUFileBuffered into MigrationState, Juan Quintela, 2012/12/19
- [Qemu-devel] [PATCH 30/34] ram: optimize migration bitmap walking, Juan Quintela, 2012/12/19
- [Qemu-devel] [PATCH 25/34] migration: move migration notifier, Juan Quintela, 2012/12/19
- [Qemu-devel] [PATCH 28/34] memory: introduce memory_region_test_and_clear_dirty,
Juan Quintela <=