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ram: Use page number instead of an address for the bitmap operations

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We use an unsigned long for the page number.  Notice that our bitmaps
already got that for the index, so we have that limit.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

--

rename page to page_abs everywhere.
fix trace types for pages
This commit is contained in:
Juan Quintela 2017-03-21 15:18:05 +01:00
parent 2479569466
commit 06b106889a
2 changed files with 36 additions and 44 deletions
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76
migration/ram.c
View File

@ -609,13 +609,12 @@ static int save_xbzrle_page(RAMState *rs, uint8_t **current_data,
* @rs: current RAM state
* @rb: RAMBlock where to search for dirty pages
* @start: starting address (typically so we can continue from previous page)
* @ram_addr_abs: pointer into which to store the address of the dirty page
* within the global ram_addr space
* @page_abs: pointer into where to store the dirty page
*/
static inline
ram_addr_t migration_bitmap_find_dirty(RAMState *rs, RAMBlock *rb,
ram_addr_t start,
ram_addr_t *ram_addr_abs)
unsigned long *page_abs)
{
unsigned long base = rb->offset >> TARGET_PAGE_BITS;
unsigned long nr = base + (start >> TARGET_PAGE_BITS);
@ -632,17 +631,17 @@ ram_addr_t migration_bitmap_find_dirty(RAMState *rs, RAMBlock *rb,
next = find_next_bit(bitmap, size, nr);
}
*ram_addr_abs = next << TARGET_PAGE_BITS;
*page_abs = next;
return (next - base) << TARGET_PAGE_BITS;
}
static inline bool migration_bitmap_clear_dirty(RAMState *rs, ram_addr_t addr)
static inline bool migration_bitmap_clear_dirty(RAMState *rs,
unsigned long page_abs)
{
bool ret;
int nr = addr >> TARGET_PAGE_BITS;
unsigned long *bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
ret = test_and_clear_bit(nr, bitmap);
ret = test_and_clear_bit(page_abs, bitmap);
if (ret) {
rs->migration_dirty_pages--;
@ -1054,14 +1053,13 @@ static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss,
* @rs: current RAM state
* @pss: data about the state of the current dirty page scan
* @again: set to false if the search has scanned the whole of RAM
* @ram_addr_abs: pointer into which to store the address of the dirty page
* within the global ram_addr space
* @page_abs: pointer into where to store the dirty page
*/
static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss,
bool *again, ram_addr_t *ram_addr_abs)
bool *again, unsigned long *page_abs)
{
pss->offset = migration_bitmap_find_dirty(rs, pss->block, pss->offset,
ram_addr_abs);
page_abs);
if (pss->complete_round && pss->block == rs->last_seen_block &&
pss->offset >= rs->last_offset) {
/*
@ -1108,11 +1106,10 @@ static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss,
*
* @rs: current RAM state
* @offset: used to return the offset within the RAMBlock
* @ram_addr_abs: pointer into which to store the address of the dirty page
* within the global ram_addr space
* @page_abs: pointer into where to store the dirty page
*/
static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset,
ram_addr_t *ram_addr_abs)
unsigned long *page_abs)
{
RAMBlock *block = NULL;
@ -1122,8 +1119,7 @@ static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset,
QSIMPLEQ_FIRST(&rs->src_page_requests);
block = entry->rb;
*offset = entry->offset;
*ram_addr_abs = (entry->offset + entry->rb->offset) &
TARGET_PAGE_MASK;
*page_abs = (entry->offset + entry->rb->offset) >> TARGET_PAGE_BITS;
if (entry->len > TARGET_PAGE_SIZE) {
entry->len -= TARGET_PAGE_SIZE;
@ -1148,18 +1144,17 @@ static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset,
*
* @rs: current RAM state
* @pss: data about the state of the current dirty page scan
* @ram_addr_abs: pointer into which to store the address of the dirty page
* within the global ram_addr space
* @page_abs: pointer into where to store the dirty page
*/
static bool get_queued_page(RAMState *rs, PageSearchStatus *pss,
ram_addr_t *ram_addr_abs)
unsigned long *page_abs)
{
RAMBlock *block;
ram_addr_t offset;
bool dirty;
do {
block = unqueue_page(rs, &offset, ram_addr_abs);
block = unqueue_page(rs, &offset, page_abs);
/*
* We're sending this page, and since it's postcopy nothing else
* will dirty it, and we must make sure it doesn't get sent again
@ -1169,17 +1164,15 @@ static bool get_queued_page(RAMState *rs, PageSearchStatus *pss,
if (block) {
unsigned long *bitmap;
bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
dirty = test_bit(*ram_addr_abs >> TARGET_PAGE_BITS, bitmap);
dirty = test_bit(*page_abs, 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(&rs->ram_bitmap)->unsentmap));
trace_get_queued_page_not_dirty(block->idstr, (uint64_t)offset,
*page_abs,
test_bit(*page_abs,
atomic_rcu_read(&rs->ram_bitmap)->unsentmap));
} else {
trace_get_queued_page(block->idstr,
(uint64_t)offset,
(uint64_t)*ram_addr_abs);
trace_get_queued_page(block->idstr, (uint64_t)offset,
*page_abs);
}
}
@ -1307,15 +1300,15 @@ err:
* @ms: current migration state
* @pss: data about the page we want to send
* @last_stage: if we are at the completion stage
* @dirty_ram_abs: address of the start of the dirty page in ram_addr_t space
* @page_abs: page number of the dirty page
*/
static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
bool last_stage, ram_addr_t dirty_ram_abs)
bool last_stage, unsigned long page_abs)
{
int res = 0;
/* Check the pages is dirty and if it is send it */
if (migration_bitmap_clear_dirty(rs, dirty_ram_abs)) {
if (migration_bitmap_clear_dirty(rs, page_abs)) {
unsigned long *unsentmap;
/*
* If xbzrle is on, stop using the data compression after first
@ -1335,7 +1328,7 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
}
unsentmap = atomic_rcu_read(&rs->ram_bitmap)->unsentmap;
if (unsentmap) {
clear_bit(dirty_ram_abs >> TARGET_PAGE_BITS, unsentmap);
clear_bit(page_abs, unsentmap);
}
}
@ -1357,24 +1350,24 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
* @ms: current migration state
* @pss: data about the page we want to send
* @last_stage: if we are at the completion stage
* @dirty_ram_abs: Address of the start of the dirty page in ram_addr_t space
* @page_abs: Page number of the dirty page
*/
static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss,
bool last_stage,
ram_addr_t dirty_ram_abs)
unsigned long page_abs)
{
int tmppages, pages = 0;
size_t pagesize = qemu_ram_pagesize(pss->block);
do {
tmppages = ram_save_target_page(rs, pss, last_stage, dirty_ram_abs);
tmppages = ram_save_target_page(rs, pss, last_stage, page_abs);
if (tmppages < 0) {
return tmppages;
}
pages += tmppages;
pss->offset += TARGET_PAGE_SIZE;
dirty_ram_abs += TARGET_PAGE_SIZE;
page_abs++;
} while (pss->offset & (pagesize - 1));
/* The offset we leave with is the last one we looked at */
@ -1401,8 +1394,7 @@ static int ram_find_and_save_block(RAMState *rs, bool last_stage)
PageSearchStatus pss;
int pages = 0;
bool again, found;
ram_addr_t dirty_ram_abs; /* Address of the start of the dirty page in
ram_addr_t space */
unsigned long page_abs; /* Page number of the dirty page */
/* No dirty page as there is zero RAM */
if (!ram_bytes_total()) {
@ -1419,15 +1411,15 @@ static int ram_find_and_save_block(RAMState *rs, bool last_stage)
do {
again = true;
found = get_queued_page(rs, &pss, &dirty_ram_abs);
found = get_queued_page(rs, &pss, &page_abs);
if (!found) {
/* priority queue empty, so just search for something dirty */
found = find_dirty_block(rs, &pss, &again, &dirty_ram_abs);
found = find_dirty_block(rs, &pss, &again, &page_abs);
}
if (found) {
pages = ram_save_host_page(rs, &pss, last_stage, dirty_ram_abs);
pages = ram_save_host_page(rs, &pss, last_stage, page_abs);
}
} while (!pages && again);

4
migration/trace-events
View File

@ -63,8 +63,8 @@ put_qtailq_end(const char *name, const char *reason) "%s %s"
qemu_file_fclose(void) ""
# migration/ram.c
get_queued_page(const char *block_name, uint64_t tmp_offset, uint64_t ram_addr) "%s/%" PRIx64 " ram_addr=%" PRIx64
get_queued_page_not_dirty(const char *block_name, uint64_t tmp_offset, uint64_t ram_addr, int sent) "%s/%" PRIx64 " ram_addr=%" PRIx64 " (sent=%d)"
get_queued_page(const char *block_name, uint64_t tmp_offset, unsigned long page_abs) "%s/%" PRIx64 " page_abs=%lx"
get_queued_page_not_dirty(const char *block_name, uint64_t tmp_offset, unsigned long page_abs, int sent) "%s/%" PRIx64 " page_abs=%lx (sent=%d)"
migration_bitmap_sync_start(void) ""
migration_bitmap_sync_end(uint64_t dirty_pages) "dirty_pages %" PRIu64
migration_throttle(void) ""