diff options
| -rw-r--r-- | include/migration/migration.h | 1 | ||||
| -rw-r--r-- | migration/ram.c | 39 |
2 files changed, 40 insertions, 0 deletions
diff --git a/include/migration/migration.h b/include/migration/migration.h index 83fba23511..51bc348fc2 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -145,6 +145,7 @@ uint64_t xbzrle_mig_pages_cache_miss(void); double xbzrle_mig_cache_miss_rate(void); void ram_handle_compressed(void *host, uint8_t ch, uint64_t size); +void ram_debug_dump_bitmap(unsigned long *todump, bool expected); /** * @migrate_add_blocker - prevent migration from proceeding diff --git a/migration/ram.c b/migration/ram.c index d654a73808..86bf6574e3 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1160,6 +1160,45 @@ void migration_bitmap_extend(ram_addr_t old, ram_addr_t new) } } +/* + * 'expected' is the value you expect the bitmap mostly to be full + * of; it won't bother printing lines that are all this value. + * If 'todump' is null the migration bitmap is dumped. + */ +void ram_debug_dump_bitmap(unsigned long *todump, bool expected) +{ + int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS; + + int64_t cur; + int64_t linelen = 128; + char linebuf[129]; + + if (!todump) { + todump = atomic_rcu_read(&migration_bitmap_rcu)->bmap; + } + + for (cur = 0; cur < ram_pages; cur += linelen) { + int64_t curb; + bool found = false; + /* + * Last line; catch the case where the line length + * is longer than remaining ram + */ + if (cur + linelen > ram_pages) { + linelen = ram_pages - cur; + } + for (curb = 0; curb < linelen; curb++) { + bool thisbit = test_bit(cur + curb, todump); + linebuf[curb] = thisbit ? '1' : '.'; + found = found || (thisbit != expected); + } + if (found) { + linebuf[curb] = '\0'; + fprintf(stderr, "0x%08" PRIx64 " : %s\n", cur, linebuf); + } + } +} + /* Each of ram_save_setup, ram_save_iterate and ram_save_complete has * long-running RCU critical section. When rcu-reclaims in the code * start to become numerous it will be necessary to reduce the |