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migration: Add pss.postcopy_requested status

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This boolean flag shows whether the current page during migration is triggered
by postcopy or not.  Then in ram_save_host_page() and deeper stack we'll be
able to have a reference on the priority of this page.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20220331150857.74406-4-peterx@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Peter Xu 2022-03-31 11:08:41 -04:00 • committed by Dr. David Alan Gilbert
parent 7f692ec79a
commit ea2faf0c35
1 changed files with 6 additions and 0 deletions
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6
migration/ram.c
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@ -414,6 +414,8 @@ struct PageSearchStatus {
unsigned long page; unsigned long page;
/* Set once we wrap around */ /* Set once we wrap around */
bool complete_round; bool complete_round;
/* Whether current page is explicitly requested by postcopy */
bool postcopy_requested;
}; };
typedef struct PageSearchStatus PageSearchStatus; typedef struct PageSearchStatus PageSearchStatus;
@ -1487,6 +1489,9 @@ retry:
*/ */
static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss, bool *again) static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss, bool *again)
{ {
/* This is not a postcopy requested page */
pss->postcopy_requested = false;
pss->page = migration_bitmap_find_dirty(rs, pss->block, pss->page); pss->page = migration_bitmap_find_dirty(rs, pss->block, pss->page);
if (pss->complete_round && pss->block == rs->last_seen_block && if (pss->complete_round && pss->block == rs->last_seen_block &&
pss->page >= rs->last_page) { pss->page >= rs->last_page) {
@ -1981,6 +1986,7 @@ static bool get_queued_page(RAMState *rs, PageSearchStatus *pss)
* really rare. * really rare.
*/ */
pss->complete_round = false; pss->complete_round = false;
pss->postcopy_requested = true;
} }
return !!block; return !!block;