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Re: [Qemu-devel] [PATCH] Changing error message of QMP 'migrate_set_down


From: Daniel Henrique Barboza
Subject: Re: [Qemu-devel] [PATCH] Changing error message of QMP 'migrate_set_downtime' to seconds
Date: Fri, 17 Feb 2017 17:01:28 -0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0



On 02/17/2017 03:37 PM, Paolo Bonzini wrote:

On 17/02/2017 18:26, Daniel Henrique Barboza wrote:
The previous error message was displaying the values in miliseconds,
being misleading with the command that accepts the value in seconds:

{ "execute": "migrate_set_downtime", "arguments": {"value": 3000}}
{"error": {"class": "GenericError", "desc": "Parameter 'downtime_limit'
expects an integer in the range of 0 to 2000000 milliseconds"}}

This patch changes it to '2000 seconds' to keep consistency with
the expected parameter.

Signed-off-by: Daniel Henrique Barboza <address@hidden>
---
  migration/migration.c | 8 ++++++--
  1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index c6ae69d..2dc63b1 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -49,6 +49,9 @@
   * for sending the last part */
  #define DEFAULT_MIGRATE_SET_DOWNTIME 300
+/* Maximum migrate downtime set to 2000*1000 miliseconds */
+#define MAX_MIGRATE_SET_DOWNTIME (2000 * 1000)
+
  /* Default compression thread count */
  #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
  /* Default decompression thread count, usually decompression is at
@@ -843,10 +846,11 @@ void qmp_migrate_set_parameters(MigrationParameters 
*params, Error **errp)
          return;
      }
      if (params->has_downtime_limit &&
-        (params->downtime_limit < 0 || params->downtime_limit > 2000000)) {
+        (params->downtime_limit < 0 ||
+         params->downtime_limit > MAX_MIGRATE_SET_DOWNTIME)) {
          error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
                     "downtime_limit",
-                   "an integer in the range of 0 to 2000000 milliseconds");
+                   "an integer in the range of 0 to 2000 seconds");
Perhaps you could use %d and set  MAX_MIGRATE_SET_DOWNTIME to 2000?
Though perhaps the migration maintainers are okay with the patch as is.

I did that at first but I got errors on "error_setg" about the extra parameter. I even considered using sprintf to format the string but I was afraid it would be
a little overkill.


Daniel


Paolo

          return;
      }
      if (params->has_x_checkpoint_delay && (params->x_checkpoint_delay < 0)) {





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