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migration: reduce the count of strlen call 

'strlen' is called three times in 'save_page_header', it's
inefficient.

Signed-off-by: Liang Li <liang.z.li@intel.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Liang Li 2015-07-13 17:34:10 +08:00 committed by Juan Quintela
parent 48212d87d6
commit 9f5f380b54
1 changed files with 5 additions and 5 deletions
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10
migration/ram.c
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@ -382,16 +382,16 @@ void migrate_compress_threads_create(void)
*/ */
static size_t save_page_header(QEMUFile *f, RAMBlock *block, ram_addr_t offset) static size_t save_page_header(QEMUFile *f, RAMBlock *block, ram_addr_t offset)
{ {
size_t size; size_t size, len;
qemu_put_be64(f, offset); qemu_put_be64(f, offset);
size = 8; size = 8;
if (!(offset & RAM_SAVE_FLAG_CONTINUE)) { if (!(offset & RAM_SAVE_FLAG_CONTINUE)) {
qemu_put_byte(f, strlen(block->idstr)); len = strlen(block->idstr);
qemu_put_buffer(f, (uint8_t *)block->idstr, qemu_put_byte(f, len);
strlen(block->idstr)); qemu_put_buffer(f, (uint8_t *)block->idstr, len);
size += 1 + strlen(block->idstr); size += 1 + len;
} }
return size; return size;
} }