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Re: [Qemu-devel] [PATCH 05/12] migration: show the statistics of compres

From: Xiao Guangrong
Subject: Re: [Qemu-devel] [PATCH 05/12] migration: show the statistics of compression
Date: Thu, 14 Jun 2018 14:48:55 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 06/14/2018 12:25 AM, Dr. David Alan Gilbert wrote:
static void migration_bitmap_sync(RAMState *rs)
@@ -1412,6 +1441,9 @@ static void flush_compressed_data(RAMState *rs)
          if (!comp_param[idx].quit) {
              len = qemu_put_qemu_file(rs->f, comp_param[idx].file);
+            /* 8 means a header with RAM_SAVE_FLAG_CONTINUE. */
+            compression_counters.reduced_size += TARGET_PAGE_SIZE - len + 8;

I think I'd rather save just len+8 rather than than the subtraction.

Hmmmmmm, is this what you want?
      compression_counters.reduced_size += len - 8;

Then calculate the real reduced size in populate_ram_info() where we return this
info to the user:
      info->compression->reduced_size = compression_counters.pages * PAGE_SIZE 
- compression_counters.reduced_size;


I think other than that, and Eric's comments, it's OK.


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