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migration: Drop return code for disgard ram process

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It will just never fail.  Drop those return values where they're constantly
zeros.

A tiny touch-up on the tracepoint so trace_ram_postcopy_send_discard_bitmap()
is called after the logic itself (which sounds more reasonable).

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2021-12-07 19:50:14 +08:00 committed by Juan Quintela
parent f30c2e5ba8
commit 739fcc1b0e
3 changed files with 7 additions and 20 deletions
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5
migration/migration.c
View File

@ -2991,10 +2991,7 @@ static int postcopy_start(MigrationState *ms)
* that are dirty
*/
if (migrate_postcopy_ram()) {
if (ram_postcopy_send_discard_bitmap(ms)) {
error_report("postcopy send discard bitmap failed");
goto fail;
}
ram_postcopy_send_discard_bitmap(ms);
}
/*

20
migration/ram.c
View File

@ -2459,8 +2459,6 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, RAMBlock *block);
/**
* postcopy_each_ram_send_discard: discard all RAMBlocks
*
* Returns 0 for success or negative for error
*
* Utility for the outgoing postcopy code.
* Calls postcopy_send_discard_bm_ram for each RAMBlock
* passing it bitmap indexes and name.
@ -2469,10 +2467,9 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, RAMBlock *block);
*
* @ms: current migration state
*/
static int postcopy_each_ram_send_discard(MigrationState *ms)
static void postcopy_each_ram_send_discard(MigrationState *ms)
{
struct RAMBlock *block;
int ret;
RAMBLOCK_FOREACH_NOT_IGNORED(block) {
postcopy_discard_send_init(ms, block->idstr);
@ -2490,14 +2487,9 @@ static int postcopy_each_ram_send_discard(MigrationState *ms)
* just needs indexes at this point, avoids it having
* target page specific code.
*/
ret = postcopy_send_discard_bm_ram(ms, block);
postcopy_send_discard_bm_ram(ms, block);
postcopy_discard_send_finish(ms);
if (ret) {
return ret;
}
}
return 0;
}
/**
@ -2570,8 +2562,6 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, RAMBlock *block)
/**
* ram_postcopy_send_discard_bitmap: transmit the discard bitmap
*
* Returns zero on success
*
* Transmit the set of pages to be discarded after precopy to the target
* these are pages that:
* a) Have been previously transmitted but are now dirty again
@ -2582,7 +2572,7 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, RAMBlock *block)
*
* @ms: current migration state
*/
int ram_postcopy_send_discard_bitmap(MigrationState *ms)
void ram_postcopy_send_discard_bitmap(MigrationState *ms)
{
RAMState *rs = ram_state;
@ -2596,9 +2586,9 @@ int ram_postcopy_send_discard_bitmap(MigrationState *ms)
rs->last_sent_block = NULL;
rs->last_page = 0;
trace_ram_postcopy_send_discard_bitmap();
postcopy_each_ram_send_discard(ms);
return postcopy_each_ram_send_discard(ms);
trace_ram_postcopy_send_discard_bitmap();
}
/**

2
migration/ram.h
View File

@ -57,7 +57,7 @@ int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len);
void acct_update_position(QEMUFile *f, size_t size, bool zero);
void ram_postcopy_migrated_memory_release(MigrationState *ms);
/* For outgoing discard bitmap */
int ram_postcopy_send_discard_bitmap(MigrationState *ms);
void ram_postcopy_send_discard_bitmap(MigrationState *ms);
/* For incoming postcopy discard */
int ram_discard_range(const char *block_name, uint64_t start, size_t length);
int ram_postcopy_incoming_init(MigrationIncomingState *mis);