migration: introduce save_zero_page_to_file
It will be used by the compression threads Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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@ -1671,6 +1671,31 @@ static void migration_bitmap_sync(RAMState *rs)
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}
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}
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}
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}
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/**
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* save_zero_page_to_file: send the zero page to the file
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*
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* Returns the size of data written to the file, 0 means the page is not
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* a zero page
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*
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* @rs: current RAM state
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* @file: the file where the data is saved
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* @block: block that contains the page we want to send
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* @offset: offset inside the block for the page
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*/
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static int save_zero_page_to_file(RAMState *rs, QEMUFile *file,
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RAMBlock *block, ram_addr_t offset)
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{
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uint8_t *p = block->host + offset;
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int len = 0;
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if (is_zero_range(p, TARGET_PAGE_SIZE)) {
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len += save_page_header(rs, file, block, offset | RAM_SAVE_FLAG_ZERO);
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qemu_put_byte(file, 0);
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len += 1;
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}
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return len;
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}
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/**
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/**
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* save_zero_page: send the zero page to the stream
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* save_zero_page: send the zero page to the stream
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*
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*
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@ -1682,19 +1707,14 @@ static void migration_bitmap_sync(RAMState *rs)
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*/
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*/
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static int save_zero_page(RAMState *rs, RAMBlock *block, ram_addr_t offset)
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static int save_zero_page(RAMState *rs, RAMBlock *block, ram_addr_t offset)
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{
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{
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uint8_t *p = block->host + offset;
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int len = save_zero_page_to_file(rs, rs->f, block, offset);
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int pages = -1;
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if (is_zero_range(p, TARGET_PAGE_SIZE)) {
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if (len) {
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ram_counters.duplicate++;
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ram_counters.duplicate++;
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ram_counters.transferred +=
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ram_counters.transferred += len;
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save_page_header(rs, rs->f, block, offset | RAM_SAVE_FLAG_ZERO);
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return 1;
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qemu_put_byte(rs->f, 0);
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ram_counters.transferred += 1;
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pages = 1;
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}
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}
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return -1;
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return pages;
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}
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}
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static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
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static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
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