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memory: syncronize kvm bitmap using bitmaps operations 

If bitmaps are aligned properly, use bitmap operations.  If they are
not, just use old bit at a time code.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
This commit is contained in:
Juan Quintela 2013-11-05 16:46:26 +01:00
parent 5ff7fb77b3
commit ae2810c4bb
1 changed files with 36 additions and 18 deletions
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54
include/exec/ram_addr.h
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@ -83,29 +83,47 @@ static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
ram_addr_t start,
ram_addr_t pages)
{
unsigned int i, j;
unsigned long i, j;
unsigned long page_number, c;
hwaddr addr;
ram_addr_t ram_addr;
unsigned int len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
unsigned long len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE;
unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
/*
* bitmap-traveling is faster than memory-traveling (for addr...)
* especially when most of the memory is not dirty.
*/
for (i = 0; i < len; i++) {
if (bitmap[i] != 0) {
c = leul_to_cpu(bitmap[i]);
do {
j = ffsl(c) - 1;
c &= ~(1ul << j);
page_number = (i * HOST_LONG_BITS + j) * hpratio;
addr = page_number * TARGET_PAGE_SIZE;
ram_addr = start + addr;
cpu_physical_memory_set_dirty_range(ram_addr,
TARGET_PAGE_SIZE * hpratio);
} while (c != 0);
/* start address is aligned at the start of a word? */
if (((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) {
long k;
long nr = BITS_TO_LONGS(pages);
for (k = 0; k < nr; k++) {
if (bitmap[k]) {
unsigned long temp = leul_to_cpu(bitmap[k]);
ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION][page + k] |= temp;
ram_list.dirty_memory[DIRTY_MEMORY_VGA][page + k] |= temp;
ram_list.dirty_memory[DIRTY_MEMORY_CODE][page + k] |= temp;
}
}
xen_modified_memory(start, pages);
} else {
/*
* bitmap-traveling is faster than memory-traveling (for addr...)
* especially when most of the memory is not dirty.
*/
for (i = 0; i < len; i++) {
if (bitmap[i] != 0) {
c = leul_to_cpu(bitmap[i]);
do {
j = ffsl(c) - 1;
c &= ~(1ul << j);
page_number = (i * HOST_LONG_BITS + j) * hpratio;
addr = page_number * TARGET_PAGE_SIZE;
ram_addr = start + addr;
cpu_physical_memory_set_dirty_range(ram_addr,
TARGET_PAGE_SIZE * hpratio);
} while (c != 0);
}
}
}
}