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Re: [PATCH v3] migration: using trace_ to replace DPRINTF


From: Philippe Mathieu-Daudé
Subject: Re: [PATCH v3] migration: using trace_ to replace DPRINTF
Date: Tue, 20 Oct 2020 10:11:46 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1

On 10/20/20 9:32 AM, Bihong Yu wrote:
Signed-off-by: Bihong Yu <yubihong@huawei.com>
---
  migration/block.c      | 36 ++++++++++++++++++------------------
  migration/page_cache.c | 13 +++----------
  migration/trace-events | 13 +++++++++++++
  3 files changed, 34 insertions(+), 28 deletions(-)

diff --git a/migration/block.c b/migration/block.c
index 273392b..a950977 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -26,6 +26,7 @@
  #include "qemu-file.h"
  #include "migration/vmstate.h"
  #include "sysemu/block-backend.h"
+#include "trace.h"
#define BLK_MIG_BLOCK_SIZE (1 << 20)
  #define BDRV_SECTORS_PER_DIRTY_CHUNK (BLK_MIG_BLOCK_SIZE >> BDRV_SECTOR_BITS)
@@ -434,10 +435,9 @@ static int init_blk_migration(QEMUFile *f)
          block_mig_state.total_sector_sum += sectors;
if (bmds->shared_base) {
-            DPRINTF("Start migration for %s with shared base image\n",
-                    bdrv_get_device_name(bs));
+            trace_migration_block_init_shared(bdrv_get_device_name(bs));
          } else {
-            DPRINTF("Start full migration for %s\n", bdrv_get_device_name(bs));
+            trace_migration_block_init_full(bdrv_get_device_name(bs));
          }
QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry);
@@ -592,7 +592,7 @@ static int mig_save_device_dirty(QEMUFile *f, 
BlkMigDevState *bmds,
      return (bmds->cur_dirty >= bmds->total_sectors);
error:
-    DPRINTF("Error reading sector %" PRId64 "\n", sector);
+    trace_migration_block_save_device_dirty(sector);
      g_free(blk->buf);
      g_free(blk);
      return ret;
@@ -628,9 +628,9 @@ static int flush_blks(QEMUFile *f)
      BlkMigBlock *blk;
      int ret = 0;
- DPRINTF("%s Enter submitted %d read_done %d transferred %d\n",
-            __func__, block_mig_state.submitted, block_mig_state.read_done,
-            block_mig_state.transferred);
+    trace_migration_block_flush_blks("Enter", block_mig_state.submitted,
+                                     block_mig_state.read_done,
+                                     block_mig_state.transferred);
blk_mig_lock();
      while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) {
@@ -656,9 +656,9 @@ static int flush_blks(QEMUFile *f)
      }
      blk_mig_unlock();
- DPRINTF("%s Exit submitted %d read_done %d transferred %d\n", __func__,
-            block_mig_state.submitted, block_mig_state.read_done,
-            block_mig_state.transferred);
+    trace_migration_block_flush_blks("Exit", block_mig_state.submitted,
+                                     block_mig_state.read_done,
+                                     block_mig_state.transferred);
      return ret;
  }
@@ -727,8 +727,8 @@ static int block_save_setup(QEMUFile *f, void *opaque)
  {
      int ret;
- DPRINTF("Enter save live setup submitted %d transferred %d\n",
-            block_mig_state.submitted, block_mig_state.transferred);
+    trace_migration_block_save("setup", block_mig_state.submitted,
+                               block_mig_state.transferred);
qemu_mutex_lock_iothread();
      ret = init_blk_migration(f);
@@ -759,8 +759,8 @@ static int block_save_iterate(QEMUFile *f, void *opaque)
      int64_t last_ftell = qemu_ftell(f);
      int64_t delta_ftell;
- DPRINTF("Enter save live iterate submitted %d transferred %d\n",
-            block_mig_state.submitted, block_mig_state.transferred);
+    trace_migration_block_save("iterate", block_mig_state.submitted,
+                               block_mig_state.transferred);
ret = flush_blks(f);
      if (ret) {
@@ -825,8 +825,8 @@ static int block_save_complete(QEMUFile *f, void *opaque)
  {
      int ret;
- DPRINTF("Enter save live complete submitted %d transferred %d\n",
-            block_mig_state.submitted, block_mig_state.transferred);
+    trace_migration_block_save("complete", block_mig_state.submitted,
+                               block_mig_state.transferred);
ret = flush_blks(f);
      if (ret) {
@@ -851,7 +851,7 @@ static int block_save_complete(QEMUFile *f, void *opaque)
      /* report completion */
      qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
- DPRINTF("Block migration completed\n");
+    trace_migration_block_save_complete();
qemu_put_be64(f, BLK_MIG_FLAG_EOS); @@ -884,7 +884,7 @@ static void block_save_pending(QEMUFile *f, void *opaque, uint64_t max_size,
          pending = max_size + BLK_MIG_BLOCK_SIZE;
      }
- DPRINTF("Enter save live pending %" PRIu64 "\n", pending);
+    trace_migration_block_save_pending(pending);
      /* We don't do postcopy */
      *res_precopy_only += pending;
  }
diff --git a/migration/page_cache.c b/migration/page_cache.c
index 775582f..098b436 100644
--- a/migration/page_cache.c
+++ b/migration/page_cache.c
@@ -18,14 +18,7 @@
  #include "qapi/error.h"
  #include "qemu/host-utils.h"
  #include "page_cache.h"
-
-#ifdef DEBUG_CACHE
-#define DPRINTF(fmt, ...) \
-    do { fprintf(stdout, "cache: " fmt, ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...) \
-    do { } while (0)
-#endif
+#include "trace.h"
/* the page in cache will not be replaced in two cycles */
  #define CACHED_PAGE_LIFETIME 2
@@ -75,7 +68,7 @@ PageCache *cache_init(int64_t new_size, size_t page_size, 
Error **errp)
      cache->num_items = 0;
      cache->max_num_items = num_pages;
- DPRINTF("Setting cache buckets to %" PRId64 "\n", cache->max_num_items);
+    trace_migration_pagecache_init(cache->max_num_items);
/* We prefer not to abort if there is no memory */
      cache->page_cache = g_try_malloc((cache->max_num_items) *
@@ -169,7 +162,7 @@ int cache_insert(PageCache *cache, uint64_t addr, const 
uint8_t *pdata,
      if (!it->it_data) {
          it->it_data = g_try_malloc(cache->page_size);
          if (!it->it_data) {
-            DPRINTF("Error allocating page\n");
+            trace_migration_pagecache_insert();
              return -1;
          }
          cache->num_items++;
diff --git a/migration/trace-events b/migration/trace-events
index 338f38b..c775511 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -325,3 +325,16 @@ get_ramblock_vfn_hash(const char *idstr, uint64_t vfn, uint32_t 
crc) "ramblock n
  calc_page_dirty_rate(const char *idstr, uint32_t new_crc, uint32_t old_crc) "ramblock name: 
%s, new crc: %" PRIu32 ", old crc: %" PRIu32
  skip_sample_ramblock(const char *idstr, uint64_t ramblock_size) "ramblock name: 
%s, ramblock size: %" PRIu64
  find_page_matched(const char *idstr) "ramblock %s addr or size changed"
+
+# block.c
+migration_block_init_shared(const char *blk_device_name) "Start migration for %s 
with shared base image"
+migration_block_init_full(const char *blk_device_name) "Start full migration for 
%s"
+migration_block_save_device_dirty(int64_t sector) "Error reading sector %" 
PRId64
+migration_block_flush_blks(const char *action, int submitted, int read_done, int 
transferred) "%s submitted %d read_done %d transferred %d"

Maybe "%s (submitted %d, read_done %d, transferred %d)"

+migration_block_save(const char *mig_stage, int submitted, int transferred) "Enter 
save live %s submitted %d transferred %d"
+migration_block_save_complete(void) "Block migration completed"
+migration_block_save_pending(uint64_t pending) "Enter save live pending  %" 
PRIu64

Maybe "save live (blocks pending: %" PRIu64 ")"

+
+# page_cache.c
+migration_pagecache_init(int64_t max_num_items) "Setting cache buckets to %" 
PRId64

Maybe "Setting cache to %" PRId64 " buckets"

+migration_pagecache_insert(void) "Error allocating page"


Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>




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