[PATCH v3 4/8] migration: Do chunk page in postcopy_each_ram_send_discard()

[Peter Xu]

Right now we loop ramblocks for twice, the 1st time chunk the dirty bits with
huge page information; the 2nd time we send the discard ranges.  That's not
necessary - we can do them in a single loop.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/ram.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index b22c9e7432..e7107b9790 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2468,6 +2468,8 @@ static int postcopy_send_discard_bm_ram(MigrationState 
*ms, RAMBlock *block)
     return 0;
 }
 
+static void postcopy_chunk_hostpages_pass(MigrationState *ms, RAMBlock *block);
+
 /**
  * postcopy_each_ram_send_discard: discard all RAMBlocks
  *
@@ -2489,6 +2491,14 @@ static int postcopy_each_ram_send_discard(MigrationState 
*ms)
     RAMBLOCK_FOREACH_NOT_IGNORED(block) {
         postcopy_discard_send_init(ms, block->idstr);
 
+        /*
+         * Deal with TPS != HPS and huge pages.  It discard any partially sent
+         * host-page size chunks, mark any partially dirty host-page size
+         * chunks as all dirty.  In this case the host-page is the host-page
+         * for the particular RAMBlock, i.e. it might be a huge page.
+         */
+        postcopy_chunk_hostpages_pass(ms, block);
+
         /*
          * Postcopy sends chunks of bitmap over the wire, but it
          * just needs indexes at this point, avoids it having
@@ -2589,7 +2599,6 @@ static void postcopy_chunk_hostpages_pass(MigrationState 
*ms, RAMBlock *block)
 int ram_postcopy_send_discard_bitmap(MigrationState *ms)
 {
     RAMState *rs = ram_state;
-    RAMBlock *block;
 
     RCU_READ_LOCK_GUARD();
 
@@ -2601,15 +2610,6 @@ int ram_postcopy_send_discard_bitmap(MigrationState *ms)
     rs->last_sent_block = NULL;
     rs->last_page = 0;
 
-    RAMBLOCK_FOREACH_NOT_IGNORED(block) {
-        /*
-         * Deal with TPS != HPS and huge pages.  It discard any partially sent
-         * host-page size chunks, mark any partially dirty host-page size
-         * chunks as all dirty.  In this case the host-page is the host-page
-         * for the particular RAMBlock, i.e. it might be a huge page.
-         */
-        postcopy_chunk_hostpages_pass(ms, block);
-    }
     trace_ram_postcopy_send_discard_bitmap();
 
     return postcopy_each_ram_send_discard(ms);
-- 
2.32.0