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platform: smarter detection of big cores

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If big_core  is not explicitly specified by the user, it is populated by
Platform (provided the target has exactly two clusters). Perviously this
was done bu assuming that the target boots on little cluster and that
the last CPU is big. This is still used as a fallback, but now Platform
is ware of the names of big CPUs in currently existing big.LITTLE
configurations and uses that first to identify the big.
This commit is contained in:
Sergei Trofimov 2015-12-16 17:19:40 +00:00
parent 59f4f81447
commit 47bf915b7c
1 changed files with 11 additions and 2 deletions
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13
devlib/platform/__init__.py
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@ -1,6 +1,9 @@
import logging import logging
BIG_CPUS = ['A15', 'A57', 'A72']
class Platform(object): class Platform(object):
@property @property
@ -36,8 +39,7 @@ class Platform(object):
self.core_names = target.cpuinfo.cpu_names self.core_names = target.cpuinfo.cpu_names
self._set_core_clusters_from_core_names() self._set_core_clusters_from_core_names()
if not self.big_core and self.number_of_clusters == 2: if not self.big_core and self.number_of_clusters == 2:
big_idx = self.core_clusters.index(max(self.core_clusters)) self.big_core = self._identify_big_core()
self.big_core = self.core_names[big_idx]
if not self.core_clusters and self.core_names: if not self.core_clusters and self.core_names:
self._set_core_clusters_from_core_names() self._set_core_clusters_from_core_names()
if not self.model: if not self.model:
@ -64,6 +66,13 @@ class Platform(object):
except Exception: # pylint: disable=broad-except except Exception: # pylint: disable=broad-except
pass # this is best-effort pass # this is best-effort
def _identify_big_core(self):
for core in self.core_names:
if core.upper() in BIG_CPUS:
return core
big_idx = self.core_clusters.index(max(self.core_clusters))
return self.core_names[big_idx]
def _validate(self): def _validate(self):
if len(self.core_names) != len(self.core_clusters): if len(self.core_names) != len(self.core_clusters):
raise ValueError('core_names and core_clusters are of different lengths.') raise ValueError('core_names and core_clusters are of different lengths.')