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[Qemu-devel] [PATCH 23/31] ram: Move migration_bitmap_rcu into RAMState
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PATCH 23/31] ram: Move migration_bitmap_rcu into RAMState |
Date: |
Wed, 15 Mar 2017 14:50:13 +0100 |
Once there, rename the type to be shorter.
Signed-off-by: Juan Quintela <address@hidden>
---
migration/ram.c | 79 ++++++++++++++++++++++++++++++---------------------------
1 file changed, 42 insertions(+), 37 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index c14293c..d39d185 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -132,6 +132,19 @@ out:
return ret;
}
+struct RAMBitmap {
+ struct rcu_head rcu;
+ /* Main migration bitmap */
+ unsigned long *bmap;
+ /* bitmap of pages that haven't been sent even once
+ * only maintained and used in postcopy at the moment
+ * where it's used to send the dirtymap at the start
+ * of the postcopy phase
+ */
+ unsigned long *unsentmap;
+};
+typedef struct RAMBitmap RAMBitmap;
+
/* State of RAM for migration */
struct RAMState {
/* Last block that we have visited searching for dirty pages */
@@ -180,6 +193,8 @@ struct RAMState {
uint64_t migration_dirty_pages;
/* protects modification of the bitmap */
QemuMutex bitmap_mutex;
+ /* Ram Bitmap protected by RCU */
+ RAMBitmap *ram_bitmap;
};
typedef struct RAMState RAMState;
@@ -236,18 +251,6 @@ struct PageSearchStatus {
};
typedef struct PageSearchStatus PageSearchStatus;
-static struct BitmapRcu {
- struct rcu_head rcu;
- /* Main migration bitmap */
- unsigned long *bmap;
- /* bitmap of pages that haven't been sent even once
- * only maintained and used in postcopy at the moment
- * where it's used to send the dirtymap at the start
- * of the postcopy phase
- */
- unsigned long *unsentmap;
-} *migration_bitmap_rcu;
-
struct CompressParam {
bool done;
bool quit;
@@ -554,7 +557,7 @@ ram_addr_t migration_bitmap_find_dirty(RAMState *rs,
RAMBlock *rb,
unsigned long next;
- bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
+ bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
if (rs->ram_bulk_stage && nr > base) {
next = nr + 1;
} else {
@@ -569,7 +572,7 @@ static inline bool migration_bitmap_clear_dirty(RAMState
*rs, ram_addr_t addr)
{
bool ret;
int nr = addr >> TARGET_PAGE_BITS;
- unsigned long *bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
+ unsigned long *bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
ret = test_and_clear_bit(nr, bitmap);
@@ -583,7 +586,7 @@ static void migration_bitmap_sync_range(RAMState *rs,
ram_addr_t start,
ram_addr_t length)
{
unsigned long *bitmap;
- bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
+ bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
rs-> migration_dirty_pages +=
cpu_physical_memory_sync_dirty_bitmap(bitmap, start, length);
}
@@ -1115,14 +1118,14 @@ static bool get_queued_page(RAMState *rs,
MigrationState *ms, PageSearchStatus *
*/
if (block) {
unsigned long *bitmap;
- bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
+ bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
dirty = test_bit(*ram_addr_abs >> TARGET_PAGE_BITS, bitmap);
if (!dirty) {
trace_get_queued_page_not_dirty(
block->idstr, (uint64_t)offset,
(uint64_t)*ram_addr_abs,
test_bit(*ram_addr_abs >> TARGET_PAGE_BITS,
- atomic_rcu_read(&migration_bitmap_rcu)->unsentmap));
+ atomic_rcu_read(&rs->ram_bitmap)->unsentmap));
} else {
trace_get_queued_page(block->idstr,
(uint64_t)offset,
@@ -1276,7 +1279,7 @@ static int ram_save_target_page(RAMState *rs,
MigrationState *ms, QEMUFile *f,
if (res < 0) {
return res;
}
- unsentmap = atomic_rcu_read(&migration_bitmap_rcu)->unsentmap;
+ unsentmap = atomic_rcu_read(&rs->ram_bitmap)->unsentmap;
if (unsentmap) {
clear_bit(dirty_ram_abs >> TARGET_PAGE_BITS, unsentmap);
}
@@ -1440,7 +1443,7 @@ void free_xbzrle_decoded_buf(void)
xbzrle_decoded_buf = NULL;
}
-static void migration_bitmap_free(struct BitmapRcu *bmap)
+static void migration_bitmap_free(struct RAMBitmap *bmap)
{
g_free(bmap->bmap);
g_free(bmap->unsentmap);
@@ -1449,11 +1452,13 @@ static void migration_bitmap_free(struct BitmapRcu
*bmap)
static void ram_migration_cleanup(void *opaque)
{
+ RAMState *rs = opaque;
+
/* caller have hold iothread lock or is in a bh, so there is
* no writing race against this migration_bitmap
*/
- struct BitmapRcu *bitmap = migration_bitmap_rcu;
- atomic_rcu_set(&migration_bitmap_rcu, NULL);
+ struct RAMBitmap *bitmap = rs->ram_bitmap;
+ atomic_rcu_set(&rs->ram_bitmap, NULL);
if (bitmap) {
memory_global_dirty_log_stop();
call_rcu(bitmap, migration_bitmap_free, rcu);
@@ -1488,9 +1493,9 @@ void migration_bitmap_extend(ram_addr_t old, ram_addr_t
new)
/* called in qemu main thread, so there is
* no writing race against this migration_bitmap
*/
- if (migration_bitmap_rcu) {
- struct BitmapRcu *old_bitmap = migration_bitmap_rcu, *bitmap;
- bitmap = g_new(struct BitmapRcu, 1);
+ if (ram_state.ram_bitmap) {
+ struct RAMBitmap *old_bitmap = ram_state.ram_bitmap, *bitmap;
+ bitmap = g_new(struct RAMBitmap, 1);
bitmap->bmap = bitmap_new(new);
/* prevent migration_bitmap content from being set bit
@@ -1508,7 +1513,7 @@ void migration_bitmap_extend(ram_addr_t old, ram_addr_t
new)
*/
bitmap->unsentmap = NULL;
- atomic_rcu_set(&migration_bitmap_rcu, bitmap);
+ atomic_rcu_set(&ram_state.ram_bitmap, bitmap);
qemu_mutex_unlock(&ram_state.bitmap_mutex);
ram_state.migration_dirty_pages += new - old;
call_rcu(old_bitmap, migration_bitmap_free, rcu);
@@ -1529,7 +1534,7 @@ void ram_debug_dump_bitmap(unsigned long *todump, bool
expected)
char linebuf[129];
if (!todump) {
- todump = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
+ todump = atomic_rcu_read(&ram_state.ram_bitmap)->bmap;
}
for (cur = 0; cur < ram_pages; cur += linelen) {
@@ -1559,7 +1564,7 @@ void ram_debug_dump_bitmap(unsigned long *todump, bool
expected)
void ram_postcopy_migrated_memory_release(MigrationState *ms)
{
struct RAMBlock *block;
- unsigned long *bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
+ unsigned long *bitmap = atomic_rcu_read(&ram_state.ram_bitmap)->bmap;
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
unsigned long first = block->offset >> TARGET_PAGE_BITS;
@@ -1591,7 +1596,7 @@ static int postcopy_send_discard_bm_ram(MigrationState
*ms,
unsigned long current;
unsigned long *unsentmap;
- unsentmap = atomic_rcu_read(&migration_bitmap_rcu)->unsentmap;
+ unsentmap = atomic_rcu_read(&ram_state.ram_bitmap)->unsentmap;
for (current = start; current < end; ) {
unsigned long one = find_next_bit(unsentmap, end, current);
@@ -1680,8 +1685,8 @@ static void postcopy_chunk_hostpages_pass(MigrationState
*ms, bool unsent_pass,
return;
}
- bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
- unsentmap = atomic_rcu_read(&migration_bitmap_rcu)->unsentmap;
+ bitmap = atomic_rcu_read(&ram_state.ram_bitmap)->bmap;
+ unsentmap = atomic_rcu_read(&ram_state.ram_bitmap)->unsentmap;
if (unsent_pass) {
/* Find a sent page */
@@ -1836,7 +1841,7 @@ int ram_postcopy_send_discard_bitmap(MigrationState *ms)
/* This should be our last sync, the src is now paused */
migration_bitmap_sync(&ram_state);
- unsentmap = atomic_rcu_read(&migration_bitmap_rcu)->unsentmap;
+ unsentmap = atomic_rcu_read(&ram_state.ram_bitmap)->unsentmap;
if (!unsentmap) {
/* We don't have a safe way to resize the sentmap, so
* if the bitmap was resized it will be NULL at this
@@ -1857,7 +1862,7 @@ int ram_postcopy_send_discard_bitmap(MigrationState *ms)
/*
* Update the unsentmap to be unsentmap = unsentmap | dirty
*/
- bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
+ bitmap = atomic_rcu_read(&ram_state.ram_bitmap)->bmap;
bitmap_or(unsentmap, unsentmap, bitmap,
last_ram_offset() >> TARGET_PAGE_BITS);
@@ -1950,16 +1955,16 @@ static int ram_state_init(RAMState *rs)
bytes_transferred = 0;
ram_state_reset(rs);
- migration_bitmap_rcu = g_new0(struct BitmapRcu, 1);
+ rs->ram_bitmap = g_new0(struct RAMBitmap, 1);
/* Skip setting bitmap if there is no RAM */
if (ram_bytes_total()) {
ram_bitmap_pages = last_ram_offset() >> TARGET_PAGE_BITS;
- migration_bitmap_rcu->bmap = bitmap_new(ram_bitmap_pages);
- bitmap_set(migration_bitmap_rcu->bmap, 0, ram_bitmap_pages);
+ rs->ram_bitmap->bmap = bitmap_new(ram_bitmap_pages);
+ bitmap_set(rs->ram_bitmap->bmap, 0, ram_bitmap_pages);
if (migrate_postcopy_ram()) {
- migration_bitmap_rcu->unsentmap = bitmap_new(ram_bitmap_pages);
- bitmap_set(migration_bitmap_rcu->unsentmap, 0, ram_bitmap_pages);
+ rs->ram_bitmap->unsentmap = bitmap_new(ram_bitmap_pages);
+ bitmap_set(rs->ram_bitmap->unsentmap, 0, ram_bitmap_pages);
}
}
--
2.9.3
- [Qemu-devel] [PATCH 19/31] ram: move xbzrle_overflows into RAMState, (continued)
- [Qemu-devel] [PATCH 19/31] ram: move xbzrle_overflows into RAMState, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 21/31] ram: Everything was init to zero, so use memset, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 18/31] ram: move xbzrle_cache_miss_rate into RAMState, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 17/31] ram: Move xbzrle_cache_miss into RAMState, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 16/31] ram: Move xbzrle_pages into RAMState, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 22/31] ram: move migration_bitmap_mutex into RAMState, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 20/31] ram: move migration_dirty_pages to RAMState, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 23/31] ram: Move migration_bitmap_rcu into RAMState,
Juan Quintela <=
- [Qemu-devel] [PATCH 25/31] ram: Use the RAMState bytes_transferred parameter, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 26/31] ram: Remove ram_save_remaining, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 27/31] ram: Move last_req_rb to RAMState, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 24/31] ram: Move bytes_transferred into RAMState, Juan Quintela, 2017/03/15
- [Qemu-devel] [PATCH 29/31] ram: Remove dirty_bytes_rate, Juan Quintela, 2017/03/15