When a series consists of many patches and they are (as it almost
always happens) merged in a single batch, series_update has
quadratic complexity.  Fix that by using a set.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 api/models.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/api/models.py b/api/models.py
index 81bc167..059eaeb 100644
--- a/api/models.py
+++ b/api/models.py
@@ -306,7 +306,7 @@ class Project(models.Model):
     project_head = property(get_project_head, set_project_head)
 
     def series_update(self, message_ids):
-        updated_series = []
+        updated_series = set()
         for msgid in message_ids:
             if msgid.startswith("<") and msgid.endswith(">"):
                 msgid = msgid[1:-1]
@@ -319,7 +319,7 @@ class Project(models.Model):
             mo.save()
             s = mo.get_series_head()
             if s:
-                updated_series.append(s)
+                updated_series.add(s)
         for series in updated_series:
             for p in series.get_patches():
                 if not p.is_merged:
-- 
2.21.0

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On 6/13/19 2:28 PM, Paolo Bonzini wrote:
> When a series consists of many patches and they are (as it almost
> always happens) merged in a single batch, series_update has
> quadratic complexity.  Fix that by using a set.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  api/models.py | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/api/models.py b/api/models.py
> index 81bc167..059eaeb 100644
> --- a/api/models.py
> +++ b/api/models.py
> @@ -306,7 +306,7 @@ class Project(models.Model):
>      project_head = property(get_project_head, set_project_head)
>  
>      def series_update(self, message_ids):
> -        updated_series = []
> +        updated_series = set()
>          for msgid in message_ids:
>              if msgid.startswith("<") and msgid.endswith(">"):
>                  msgid = msgid[1:-1]
> @@ -319,7 +319,7 @@ class Project(models.Model):
>              mo.save()
>              s = mo.get_series_head()
>              if s:
> -                updated_series.append(s)
> +                updated_series.add(s)
>          for series in updated_series:
>              for p in series.get_patches():
>                  if not p.is_merged:
> 

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

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