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[Qemu-devel] [PATCH 2/3] migration/ram.c: start of cpu_physical_memory_s
From: |
Wei Yang |
Subject: |
[Qemu-devel] [PATCH 2/3] migration/ram.c: start of cpu_physical_memory_sync_dirty_bitmap is always 0 |
Date: |
Tue, 30 Apr 2019 11:44:11 +0800 |
Since start of cpu_physical_memory_sync_dirty_bitmap is always 0, we can
remove this parameter and simplify the calculation a bit.
Signed-off-by: Wei Yang <address@hidden>
---
include/exec/ram_addr.h | 15 ++++++---------
migration/ram.c | 2 +-
2 files changed, 7 insertions(+), 10 deletions(-)
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index 9ecd911c3e..3dfb2d52fb 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -409,18 +409,16 @@ static inline void
cpu_physical_memory_clear_dirty_range(ram_addr_t start,
static inline
uint64_t cpu_physical_memory_sync_dirty_bitmap(RAMBlock *rb,
- ram_addr_t start,
ram_addr_t length,
uint64_t *real_dirty_pages)
{
ram_addr_t addr;
- unsigned long word = BIT_WORD((start + rb->offset) >> TARGET_PAGE_BITS);
+ unsigned long word = BIT_WORD(rb->offset >> TARGET_PAGE_BITS);
uint64_t num_dirty = 0;
unsigned long *dest = rb->bmap;
- /* start address and length is aligned at the start of a word? */
- if (((word * BITS_PER_LONG) << TARGET_PAGE_BITS) ==
- (start + rb->offset) &&
+ /* offset and length is aligned at the start of a word? */
+ if (((word * BITS_PER_LONG) << TARGET_PAGE_BITS) == (rb->offset) &&
!(length & ((BITS_PER_LONG << TARGET_PAGE_BITS) - 1))) {
int k;
int nr = BITS_TO_LONGS(length >> TARGET_PAGE_BITS);
@@ -428,14 +426,13 @@ uint64_t cpu_physical_memory_sync_dirty_bitmap(RAMBlock
*rb,
unsigned long idx = (word * BITS_PER_LONG) / DIRTY_MEMORY_BLOCK_SIZE;
unsigned long offset = BIT_WORD((word * BITS_PER_LONG) %
DIRTY_MEMORY_BLOCK_SIZE);
- unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
rcu_read_lock();
src = atomic_rcu_read(
&ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION])->blocks;
- for (k = page; k < page + nr; k++) {
+ for (k = 0; k < nr; k++) {
if (src[idx][offset]) {
unsigned long bits = atomic_xchg(&src[idx][offset], 0);
unsigned long new_dirty;
@@ -458,11 +455,11 @@ uint64_t cpu_physical_memory_sync_dirty_bitmap(RAMBlock
*rb,
for (addr = 0; addr < length; addr += TARGET_PAGE_SIZE) {
if (cpu_physical_memory_test_and_clear_dirty(
- start + addr + offset,
+ addr + offset,
TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION)) {
*real_dirty_pages += 1;
- long k = (start + addr) >> TARGET_PAGE_BITS;
+ long k = addr >> TARGET_PAGE_BITS;
if (!test_and_set_bit(k, dest)) {
num_dirty++;
}
diff --git a/migration/ram.c b/migration/ram.c
index 9948b2d021..1def8122e9 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1646,7 +1646,7 @@ static void migration_bitmap_sync_range(RAMState *rs,
RAMBlock *rb,
ram_addr_t length)
{
rs->migration_dirty_pages +=
- cpu_physical_memory_sync_dirty_bitmap(rb, 0, length,
+ cpu_physical_memory_sync_dirty_bitmap(rb, length,
&rs->num_dirty_pages_period);
}
--
2.19.1