[FIX] profiling: add profile entry manually before calling libsass

This commit proposes a mechanism to manually add a frame before a
blocking c-call and triggers it before calling libsaas.compile.

closes odoo/odoo#75519

X-original-commit: f836ff3a67d446cd8b3ab2cf573fab649153e6da
Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

odoo/addons/base/models/assetsbundle.py

@@ -22,7 +22,7 @@ except ImportError:
 from odoo import SUPERUSER_ID
 from odoo.http import request
 from odoo.modules.module import get_resource_path
-from odoo.tools import func, misc, transpile_javascript, is_odoo_module, SourceMapGenerator
+from odoo.tools import func, misc, transpile_javascript, is_odoo_module, SourceMapGenerator, profiler
 from odoo.tools.misc import html_escape as escape
 from odoo.tools.pycompat import to_text
 
@@ -1016,6 +1016,7 @@ class ScssStylesheetAsset(PreprocessedCSS):
             return super(ScssStylesheetAsset, self).compile(source)
 
         try:
+            profiler.force_hook()
             return libsass.compile(
                 string=source,
                 include_paths=[

odoo/tools/profiler.py

@@ -59,6 +59,18 @@ def make_session(name=''):
     return f'{datetime.datetime.now():%Y-%m-%d %H:%M:%S} {name}'
 
 
+def force_hook():
+    """
+    Force periodic profiling collectors to generate some stack trace.  This is
+    useful before long calls that do not release the GIL, so that the time
+    spent in those calls is attributed to a specific stack trace, instead of
+    some arbitrary former frame.
+    """
+    thread = threading.current_thread()
+    for func in getattr(thread, 'profile_hooks', ()):
+        func()
+
+
 class Collector:
     """
     Base class for objects that collect profiling data.
@@ -187,11 +199,18 @@ class PeriodicCollector(Collector):
         interval = self.profiler.params.get('traces_async_interval')
         if interval:
             self.frame_interval = min(max(float(interval), 0.001), 1)
+
+        init_thread = self.profiler.init_thread
+        if not hasattr(init_thread, 'profile_hooks'):
+            init_thread.profile_hooks = []
+        init_thread.profile_hooks.append(self.add)
+
         self.thread.start()
 
     def stop(self):
         self.active = False
         self.thread.join()
+        self.profiler.init_thread.profile_hooks.remove(self.add)
 
     def add(self, entry=None, frame=None):
         """ Add an entry (dict) to this collector. """