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migration: Calculate ram size once 

We are recalculating ram size continously, when we know that it don't
change during migration.  Create a field in RAMState to track it.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Juan Quintela 2022-05-10 19:37:36 +02:00
parent 8008a272d6
commit 8d80e1951e
1 changed files with 5 additions and 2 deletions
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7
migration/ram.c
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@ -330,6 +330,8 @@ struct RAMState {
PageSearchStatus pss[RAM_CHANNEL_MAX];
/* UFFD file descriptor, used in 'write-tracking' migration */
int uffdio_fd;
/* total ram size in bytes */
uint64_t ram_bytes_total;
/* Last block that we have visited searching for dirty pages */
RAMBlock *last_seen_block;
/* Last dirty target page we have sent */
@ -2546,7 +2548,7 @@ static int ram_find_and_save_block(RAMState *rs)
int pages = 0;
/* No dirty page as there is zero RAM */
if (!ram_bytes_total()) {
if (!rs->ram_bytes_total) {
return pages;
}
@ -3009,13 +3011,14 @@ static int ram_state_init(RAMState **rsp)
qemu_mutex_init(&(*rsp)->bitmap_mutex);
qemu_mutex_init(&(*rsp)->src_page_req_mutex);
QSIMPLEQ_INIT(&(*rsp)->src_page_requests);
(*rsp)->ram_bytes_total = ram_bytes_total();
/*
* Count the total number of pages used by ram blocks not including any
* gaps due to alignment or unplugs.
* This must match with the initial values of dirty bitmap.
*/
(*rsp)->migration_dirty_pages = ram_bytes_total() >> TARGET_PAGE_BITS;
(*rsp)->migration_dirty_pages = (*rsp)->ram_bytes_total >> TARGET_PAGE_BITS;
ram_state_reset(*rsp);
return 0;