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Migration pull 2019-09-25 

me: test fixes from (should stop hangs in postcopy tests).
   me: An RDMA cleanup hang fix
   Wei: Tidy ups around postcopy
   Marc-Andre: mem leak fix
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Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20190925a' into staging

Migration pull 2019-09-25

  me: test fixes from (should stop hangs in postcopy tests).
  me: An RDMA cleanup hang fix
  Wei: Tidy ups around postcopy
  Marc-Andre: mem leak fix

# gpg: Signature made Wed 25 Sep 2019 15:59:41 BST
# gpg:                using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full]
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-migration-20190925a:
  migration/postcopy: Recognise the recovery states as 'in_postcopy'
  tests/migration/postcopy: trim migration bandwidth
  tests/migration: Fail on unexpected migration states
  migration/rdma.c: Swap synchronize_rcu for call_rcu
  migration/rdma: Don't moan about disconnects at the end
  migration: remove sent parameter in get_queued_page_not_dirty
  migration/postcopy: unsentmap is not necessary for postcopy
  migration/postcopy: not necessary to do discard when canonicalizing bitmap
  migration: fix vmdesc leak on vmstate_save() error

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2019-09-26 14:23:58 +01:00
parent d4e536f336 3748fef9b9
commit eb13d1cf4a
8 changed files with 80 additions and 112 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/exec/ram_addr.h
View File

@ -44,12 +44,6 @@ struct RAMBlock {
size_t page_size; size_t page_size;
/* dirty bitmap used during migration */ /* dirty bitmap used during migration */
unsigned long *bmap; unsigned long *bmap;
/* bitmap of pages that haven't been sent even once
* only maintained and used in postcopy at the moment
* where it's used to send the dirtymap at the start
* of the postcopy phase
*/
unsigned long *unsentmap;
/* bitmap of already received pages in postcopy */ /* bitmap of already received pages in postcopy */
unsigned long *receivedmap; unsigned long *receivedmap;

9
migration/migration.c
View File

@ -1659,7 +1659,14 @@ bool migration_in_postcopy(void)
{ {
MigrationState *s = migrate_get_current(); MigrationState *s = migrate_get_current();
return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); switch (s->state) {
case MIGRATION_STATUS_POSTCOPY_ACTIVE:
case MIGRATION_STATUS_POSTCOPY_PAUSED:
case MIGRATION_STATUS_POSTCOPY_RECOVER:
return true;
default:
return false;
}
} }
bool migration_in_postcopy_after_devices(MigrationState *s) bool migration_in_postcopy_after_devices(MigrationState *s)

2
migration/qjson.h
View File

@ -24,4 +24,6 @@ void json_start_object(QJSON *json, const char *name);
const char *qjson_get_str(QJSON *json); const char *qjson_get_str(QJSON *json);
void qjson_finish(QJSON *json); void qjson_finish(QJSON *json);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(QJSON, qjson_destroy)
#endif /* QEMU_QJSON_H */ #endif /* QEMU_QJSON_H */

94
migration/ram.c
View File

@ -2348,7 +2348,7 @@ static bool get_queued_page(RAMState *rs, PageSearchStatus *pss)
dirty = test_bit(page, block->bmap); dirty = test_bit(page, block->bmap);
if (!dirty) { if (!dirty) {
trace_get_queued_page_not_dirty(block->idstr, (uint64_t)offset, trace_get_queued_page_not_dirty(block->idstr, (uint64_t)offset,
page, test_bit(page, block->unsentmap)); page);
} else { } else {
trace_get_queued_page(block->idstr, (uint64_t)offset, page); trace_get_queued_page(block->idstr, (uint64_t)offset, page);
} }
@ -2619,10 +2619,6 @@ static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss,
} }
pages += tmppages; pages += tmppages;
if (pss->block->unsentmap) {
clear_bit(pss->page, pss->block->unsentmap);
}
pss->page++; pss->page++;
} while ((pss->page & (pagesize_bits - 1)) && } while ((pss->page & (pagesize_bits - 1)) &&
offset_in_ramblock(pss->block, pss->page << TARGET_PAGE_BITS)); offset_in_ramblock(pss->block, pss->page << TARGET_PAGE_BITS));
@ -2776,8 +2772,6 @@ static void ram_save_cleanup(void *opaque)
block->clear_bmap = NULL; block->clear_bmap = NULL;
g_free(block->bmap); g_free(block->bmap);
block->bmap = NULL; block->bmap = NULL;
g_free(block->unsentmap);
block->unsentmap = NULL;
} }
xbzrle_cleanup(); xbzrle_cleanup();
@ -2857,8 +2851,6 @@ void ram_postcopy_migrated_memory_release(MigrationState *ms)
* Returns zero on success * Returns zero on success
* *
* Callback from postcopy_each_ram_send_discard for each RAMBlock * Callback from postcopy_each_ram_send_discard for each RAMBlock
* Note: At this point the 'unsentmap' is the processed bitmap combined
* with the dirtymap; so a '1' means it's either dirty or unsent.
* *
* @ms: current migration state * @ms: current migration state
* @block: RAMBlock to discard * @block: RAMBlock to discard
@ -2867,17 +2859,17 @@ static int postcopy_send_discard_bm_ram(MigrationState *ms, RAMBlock *block)
{ {
unsigned long end = block->used_length >> TARGET_PAGE_BITS; unsigned long end = block->used_length >> TARGET_PAGE_BITS;
unsigned long current; unsigned long current;
unsigned long *unsentmap = block->unsentmap; unsigned long *bitmap = block->bmap;
for (current = 0; current < end; ) { for (current = 0; current < end; ) {
unsigned long one = find_next_bit(unsentmap, end, current); unsigned long one = find_next_bit(bitmap, end, current);
unsigned long zero, discard_length; unsigned long zero, discard_length;
if (one >= end) { if (one >= end) {
break; break;
} }
zero = find_next_zero_bit(unsentmap, end, one + 1); zero = find_next_zero_bit(bitmap, end, one + 1);
if (zero >= end) { if (zero >= end) {
discard_length = end - one; discard_length = end - one;
@ -2928,7 +2920,7 @@ static int postcopy_each_ram_send_discard(MigrationState *ms)
} }
/** /**
* postcopy_chunk_hostpages_pass: canocalize bitmap in hostpages * postcopy_chunk_hostpages_pass: canonicalize bitmap in hostpages
* *
* Helper for postcopy_chunk_hostpages; it's called twice to * Helper for postcopy_chunk_hostpages; it's called twice to
* canonicalize the two bitmaps, that are similar, but one is * canonicalize the two bitmaps, that are similar, but one is
@ -2938,16 +2930,12 @@ static int postcopy_each_ram_send_discard(MigrationState *ms)
* clean, not a mix. This function canonicalizes the bitmaps. * clean, not a mix. This function canonicalizes the bitmaps.
* *
* @ms: current migration state * @ms: current migration state
* @unsent_pass: if true we need to canonicalize partially unsent host pages
* otherwise we need to canonicalize partially dirty host pages
* @block: block that contains the page we want to canonicalize * @block: block that contains the page we want to canonicalize
*/ */
static void postcopy_chunk_hostpages_pass(MigrationState *ms, bool unsent_pass, static void postcopy_chunk_hostpages_pass(MigrationState *ms, RAMBlock *block)
RAMBlock *block)
{ {
RAMState *rs = ram_state; RAMState *rs = ram_state;
unsigned long *bitmap = block->bmap; unsigned long *bitmap = block->bmap;
unsigned long *unsentmap = block->unsentmap;
unsigned int host_ratio = block->page_size / TARGET_PAGE_SIZE; unsigned int host_ratio = block->page_size / TARGET_PAGE_SIZE;
unsigned long pages = block->used_length >> TARGET_PAGE_BITS; unsigned long pages = block->used_length >> TARGET_PAGE_BITS;
unsigned long run_start; unsigned long run_start;
@ -2957,13 +2945,8 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, bool unsent_pass,
return; return;
} }
if (unsent_pass) { /* Find a dirty page */
/* Find a sent page */ run_start = find_next_bit(bitmap, pages, 0);
run_start = find_next_zero_bit(unsentmap, pages, 0);
} else {
/* Find a dirty page */
run_start = find_next_bit(bitmap, pages, 0);
}
while (run_start < pages) { while (run_start < pages) {
@ -2973,11 +2956,7 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, bool unsent_pass,
*/ */
if (QEMU_IS_ALIGNED(run_start, host_ratio)) { if (QEMU_IS_ALIGNED(run_start, host_ratio)) {
/* Find the end of this run */ /* Find the end of this run */
if (unsent_pass) { run_start = find_next_zero_bit(bitmap, pages, run_start + 1);
run_start = find_next_bit(unsentmap, pages, run_start + 1);
} else {
run_start = find_next_zero_bit(bitmap, pages, run_start + 1);
}
/* /*
* If the end isn't at the start of a host page, then the * If the end isn't at the start of a host page, then the
* run doesn't finish at the end of a host page * run doesn't finish at the end of a host page
@ -2991,24 +2970,9 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, bool unsent_pass,
host_ratio); host_ratio);
run_start = QEMU_ALIGN_UP(run_start, host_ratio); run_start = QEMU_ALIGN_UP(run_start, host_ratio);
/* Tell the destination to discard this page */
if (unsent_pass || !test_bit(fixup_start_addr, unsentmap)) {
/* For the unsent_pass we:
* discard partially sent pages
* For the !unsent_pass (dirty) we:
* discard partially dirty pages that were sent
* (any partially sent pages were already discarded
* by the previous unsent_pass)
*/
postcopy_discard_send_range(ms, fixup_start_addr, host_ratio);
}
/* Clean up the bitmap */ /* Clean up the bitmap */
for (page = fixup_start_addr; for (page = fixup_start_addr;
page < fixup_start_addr + host_ratio; page++) { page < fixup_start_addr + host_ratio; page++) {
/* All pages in this host page are now not sent */
set_bit(page, unsentmap);
/* /*
* Remark them as dirty, updating the count for any pages * Remark them as dirty, updating the count for any pages
* that weren't previously dirty. * that weren't previously dirty.
@ -3017,13 +2981,8 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, bool unsent_pass,
} }
} }
if (unsent_pass) { /* Find the next dirty page for the next iteration */
/* Find the next sent page for the next iteration */ run_start = find_next_bit(bitmap, pages, run_start);
run_start = find_next_zero_bit(unsentmap, pages, run_start);
} else {
/* Find the next dirty page for the next iteration */
run_start = find_next_bit(bitmap, pages, run_start);
}
} }
} }
@ -3045,13 +3004,10 @@ static int postcopy_chunk_hostpages(MigrationState *ms, RAMBlock *block)
{ {
postcopy_discard_send_init(ms, block->idstr); postcopy_discard_send_init(ms, block->idstr);
/* First pass: Discard all partially sent host pages */
postcopy_chunk_hostpages_pass(ms, true, block);
/* /*
* Second pass: Ensure that all partially dirty host pages are made * Ensure that all partially dirty host pages are made fully dirty.
* fully dirty.
*/ */
postcopy_chunk_hostpages_pass(ms, false, block); postcopy_chunk_hostpages_pass(ms, block);
postcopy_discard_send_finish(ms); postcopy_discard_send_finish(ms);
return 0; return 0;
@ -3089,19 +3045,6 @@ int ram_postcopy_send_discard_bitmap(MigrationState *ms)
rs->last_page = 0; rs->last_page = 0;
RAMBLOCK_FOREACH_NOT_IGNORED(block) { RAMBLOCK_FOREACH_NOT_IGNORED(block) {
unsigned long pages = block->used_length >> TARGET_PAGE_BITS;
unsigned long *bitmap = block->bmap;
unsigned long *unsentmap = block->unsentmap;
if (!unsentmap) {
/* We don't have a safe way to resize the sentmap, so
* if the bitmap was resized it will be NULL at this
* point.
*/
error_report("migration ram resized during precopy phase");
rcu_read_unlock();
return -EINVAL;
}
/* Deal with TPS != HPS and huge pages */ /* Deal with TPS != HPS and huge pages */
ret = postcopy_chunk_hostpages(ms, block); ret = postcopy_chunk_hostpages(ms, block);
if (ret) { if (ret) {
@ -3109,12 +3052,9 @@ int ram_postcopy_send_discard_bitmap(MigrationState *ms)
return ret; return ret;
} }
/*
* Update the unsentmap to be unsentmap = unsentmap | dirty
*/
bitmap_or(unsentmap, unsentmap, bitmap, pages);
#ifdef DEBUG_POSTCOPY #ifdef DEBUG_POSTCOPY
ram_debug_dump_bitmap(unsentmap, true, pages); ram_debug_dump_bitmap(block->bmap, true,
block->used_length >> TARGET_PAGE_BITS);
#endif #endif
} }
trace_ram_postcopy_send_discard_bitmap(); trace_ram_postcopy_send_discard_bitmap();
@ -3282,10 +3222,6 @@ static void ram_list_init_bitmaps(void)
bitmap_set(block->bmap, 0, pages); bitmap_set(block->bmap, 0, pages);
block->clear_bmap_shift = shift; block->clear_bmap_shift = shift;
block->clear_bmap = bitmap_new(clear_bmap_size(pages, shift)); block->clear_bmap = bitmap_new(clear_bmap_size(pages, shift));
if (migrate_postcopy_ram()) {
block->unsentmap = bitmap_new(pages);
bitmap_set(block->unsentmap, 0, pages);
}
} }
} }
} }

51
migration/rdma.c
View File

@ -3017,11 +3017,35 @@ static void qio_channel_rdma_set_aio_fd_handler(QIOChannel *ioc,
} }
} }
struct rdma_close_rcu {
struct rcu_head rcu;
RDMAContext *rdmain;
RDMAContext *rdmaout;
};
/* callback from qio_channel_rdma_close via call_rcu */
static void qio_channel_rdma_close_rcu(struct rdma_close_rcu *rcu)
{
if (rcu->rdmain) {
qemu_rdma_cleanup(rcu->rdmain);
}
if (rcu->rdmaout) {
qemu_rdma_cleanup(rcu->rdmaout);
}
g_free(rcu->rdmain);
g_free(rcu->rdmaout);
g_free(rcu);
}
static int qio_channel_rdma_close(QIOChannel *ioc, static int qio_channel_rdma_close(QIOChannel *ioc,
Error **errp) Error **errp)
{ {
QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc); QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(ioc);
RDMAContext *rdmain, *rdmaout; RDMAContext *rdmain, *rdmaout;
struct rdma_close_rcu *rcu = g_new(struct rdma_close_rcu, 1);
trace_qemu_rdma_close(); trace_qemu_rdma_close();
rdmain = rioc->rdmain; rdmain = rioc->rdmain;
@ -3034,18 +3058,9 @@ static int qio_channel_rdma_close(QIOChannel *ioc,
atomic_rcu_set(&rioc->rdmaout, NULL); atomic_rcu_set(&rioc->rdmaout, NULL);
} }
synchronize_rcu(); rcu->rdmain = rdmain;
rcu->rdmaout = rdmaout;
if (rdmain) { call_rcu(rcu, qio_channel_rdma_close_rcu, rcu);
qemu_rdma_cleanup(rdmain);
}
if (rdmaout) {
qemu_rdma_cleanup(rdmaout);
}
g_free(rdmain);
g_free(rdmaout);
return 0; return 0;
} }
@ -3253,10 +3268,14 @@ static void rdma_cm_poll_handler(void *opaque)
if (cm_event->event == RDMA_CM_EVENT_DISCONNECTED || if (cm_event->event == RDMA_CM_EVENT_DISCONNECTED ||
cm_event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) { cm_event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) {
error_report("receive cm event, cm event is %d", cm_event->event); if (!rdma->error_state &&
rdma->error_state = -EPIPE; migration_incoming_get_current()->state !=
if (rdma->return_path) { MIGRATION_STATUS_COMPLETED) {
rdma->return_path->error_state = -EPIPE; error_report("receive cm event, cm event is %d", cm_event->event);
rdma->error_state = -EPIPE;
if (rdma->return_path) {
rdma->return_path->error_state = -EPIPE;
}
} }
if (mis->migration_incoming_co) { if (mis->migration_incoming_co) {

3
migration/savevm.c
View File

@ -1314,7 +1314,7 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
bool in_postcopy, bool in_postcopy,
bool inactivate_disks) bool inactivate_disks)
{ {
QJSON *vmdesc; g_autoptr(QJSON) vmdesc = NULL;
int vmdesc_len; int vmdesc_len;
SaveStateEntry *se; SaveStateEntry *se;
int ret; int ret;
@ -1375,7 +1375,6 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
qemu_put_be32(f, vmdesc_len); qemu_put_be32(f, vmdesc_len);
qemu_put_buffer(f, (uint8_t *)qjson_get_str(vmdesc), vmdesc_len); qemu_put_buffer(f, (uint8_t *)qjson_get_str(vmdesc), vmdesc_len);
} }
qjson_destroy(vmdesc);
return 0; return 0;
} }

2
migration/trace-events
View File

@ -76,7 +76,7 @@ qemu_file_fclose(void) ""
# ram.c # ram.c
get_queued_page(const char *block_name, uint64_t tmp_offset, unsigned long page_abs) "%s/0x%" PRIx64 " page_abs=0x%lx" get_queued_page(const char *block_name, uint64_t tmp_offset, unsigned long page_abs) "%s/0x%" PRIx64 " page_abs=0x%lx"
get_queued_page_not_dirty(const char *block_name, uint64_t tmp_offset, unsigned long page_abs, int sent) "%s/0x%" PRIx64 " page_abs=0x%lx (sent=%d)" get_queued_page_not_dirty(const char *block_name, uint64_t tmp_offset, unsigned long page_abs) "%s/0x%" PRIx64 " page_abs=0x%lx"
migration_bitmap_sync_start(void) "" migration_bitmap_sync_start(void) ""
migration_bitmap_sync_end(uint64_t dirty_pages) "dirty_pages %" PRIu64 migration_bitmap_sync_end(uint64_t dirty_pages) "dirty_pages %" PRIu64
migration_bitmap_clear_dirty(char *str, uint64_t start, uint64_t size, unsigned long page) "rb %s start 0x%"PRIx64" size 0x%"PRIx64" page 0x%lx" migration_bitmap_clear_dirty(char *str, uint64_t start, uint64_t size, unsigned long page) "rb %s start 0x%"PRIx64" size 0x%"PRIx64" page 0x%lx"

25
tests/migration-test.c
View File

@ -255,15 +255,19 @@ static void read_blocktime(QTestState *who)
} }
static void wait_for_migration_status(QTestState *who, static void wait_for_migration_status(QTestState *who,
const char *goal) const char *goal,
const char **ungoals)
{ {
while (true) { while (true) {
bool completed; bool completed;
char *status; char *status;
const char **ungoal;
status = migrate_query_status(who); status = migrate_query_status(who);
completed = strcmp(status, goal) == 0; completed = strcmp(status, goal) == 0;
g_assert_cmpstr(status, !=, "failed"); for (ungoal = ungoals; *ungoal; ungoal++) {
g_assert_cmpstr(status, !=, *ungoal);
}
g_free(status); g_free(status);
if (completed) { if (completed) {
return; return;
@ -274,7 +278,8 @@ static void wait_for_migration_status(QTestState *who,
static void wait_for_migration_complete(QTestState *who) static void wait_for_migration_complete(QTestState *who)
{ {
wait_for_migration_status(who, "completed"); wait_for_migration_status(who, "completed",
(const char * []) { "failed", NULL });
} }
static void wait_for_migration_pass(QTestState *who) static void wait_for_migration_pass(QTestState *who)
@ -748,7 +753,7 @@ static int migrate_postcopy_prepare(QTestState **from_ptr,
* quickly, but that it doesn't complete precopy even on a slow * quickly, but that it doesn't complete precopy even on a slow
* machine, so also set the downtime. * machine, so also set the downtime.
*/ */
migrate_set_parameter_int(from, "max-bandwidth", 100000000); migrate_set_parameter_int(from, "max-bandwidth", 30000000);
migrate_set_parameter_int(from, "downtime-limit", 1); migrate_set_parameter_int(from, "downtime-limit", 1);
/* Wait for the first serial output from the source */ /* Wait for the first serial output from the source */
@ -809,7 +814,9 @@ static void test_postcopy_recovery(void)
* Wait until postcopy is really started; we can only run the * Wait until postcopy is really started; we can only run the
* migrate-pause command during a postcopy * migrate-pause command during a postcopy
*/ */
wait_for_migration_status(from, "postcopy-active"); wait_for_migration_status(from, "postcopy-active",
(const char * []) { "failed",
"completed", NULL });
/* /*
* Manually stop the postcopy migration. This emulates a network * Manually stop the postcopy migration. This emulates a network
@ -822,7 +829,9 @@ static void test_postcopy_recovery(void)
* migrate-recover command can only succeed if destination machine * migrate-recover command can only succeed if destination machine
* is in the paused state * is in the paused state
*/ */
wait_for_migration_status(to, "postcopy-paused"); wait_for_migration_status(to, "postcopy-paused",
(const char * []) { "failed", "active",
"completed", NULL });
/* /*
* Create a new socket to emulate a new channel that is different * Create a new socket to emulate a new channel that is different
@ -836,7 +845,9 @@ static void test_postcopy_recovery(void)
* Try to rebuild the migration channel using the resume flag and * Try to rebuild the migration channel using the resume flag and
* the newly created channel * the newly created channel
*/ */
wait_for_migration_status(from, "postcopy-paused"); wait_for_migration_status(from, "postcopy-paused",
(const char * []) { "failed", "active",
"completed", NULL });
migrate(from, uri, "{'resume': true}"); migrate(from, uri, "{'resume': true}");
g_free(uri); g_free(uri);