[PATCH 04/10] selftests/damon/_damon_sysfs: use 'is' instead of '==' for 'None'

SeongJae Park
2024-05-03T18:03:25Z

_damon_sysfs.py is using '==' or '!=' for 'None'. Since 'None' is a
singleton, using 'is' or 'is not' is more efficient. Use the more
efficient one.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
tools/testing/selftests/damon/_damon_sysfs.py | 80 +++++++++----------
1 file changed, 40 insertions(+), 40 deletions(-)

diff --git a/tools/testing/selftests/damon/_damon_sysfs.py b/tools/testing/selftests/damon/_damon_sysfs.py
index 5367e98817a9..01d4b8022d50 100644
--- a/tools/testing/selftests/damon/_damon_sysfs.py
+++ b/tools/testing/selftests/damon/_damon_sysfs.py
@@ -45,11 +45,11 @@ class DamosAccessPattern:
self.nr_accesses = nr_accesses
self.age = age

- if self.size == None:
+ if self.size is None:
self.size = [0, 2**64 - 1]
- if self.nr_accesses == None:
+ if self.nr_accesses is None:
self.nr_accesses = [0, 2**64 - 1]
- if self.age == None:
+ if self.age is None:
self.age = [0, 2**64 - 1]

def sysfs_dir(self):
@@ -58,27 +58,27 @@ class DamosAccessPattern:
def stage(self):
err = write_file(
os.path.join(self.sysfs_dir(), 'sz', 'min'), self.size[0])
- if err != None:
+ if err is not None:
return err
err = write_file(
os.path.join(self.sysfs_dir(), 'sz', 'max'), self.size[1])
- if err != None:
+ if err is not None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'nr_accesses', 'min'),
self.nr_accesses[0])
- if err != None:
+ if err is not None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'nr_accesses', 'max'),
self.nr_accesses[1])
- if err != None:
+ if err is not None:
return err
err = write_file(
os.path.join(self.sysfs_dir(), 'age', 'min'), self.age[0])
- if err != None:
+ if err is not None:
return err
err = write_file(
os.path.join(self.sysfs_dir(), 'age', 'max'), self.age[1])
- if err != None:
+ if err is not None:
return err

qgoal_metric_user_input = 'user_input'
@@ -137,14 +137,14 @@ class DamosQuota:

def stage(self):
err = write_file(os.path.join(self.sysfs_dir(), 'bytes'), self.sz)
- if err != None:
+ if err is not None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'ms'), self.ms)
- if err != None:
+ if err is not None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'reset_interval_ms'),
self.reset_interval_ms)
- if err != None:
+ if err is not None:
return err

nr_goals_file = os.path.join(self.sysfs_dir(), 'goals', 'nr_goals')
@@ -201,30 +201,30 @@ class Damos:

def stage(self):
err = write_file(os.path.join(self.sysfs_dir(), 'action'), self.action)
- if err != None:
+ if err is not None:
return err
err = self.access_pattern.stage()
- if err != None:
+ if err is not None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'apply_interval_us'),
'%d' % self.apply_interval_us)
- if err != None:
+ if err is not None:
return err

err = self.quota.stage()
- if err != None:
+ if err is not None:
return err

# disable watermarks
err = write_file(
os.path.join(self.sysfs_dir(), 'watermarks', 'metric'), 'none')
- if err != None:
+ if err is not None:
return err

# disable filters
err = write_file(
os.path.join(self.sysfs_dir(), 'filters', 'nr_filters'), '0')
- if err != None:
+ if err is not None:
return err

class DamonTarget:
@@ -243,7 +243,7 @@ class DamonTarget:
def stage(self):
err = write_file(
os.path.join(self.sysfs_dir(), 'regions', 'nr_regions'), '0')
- if err != None:
+ if err is not None:
return err
return write_file(
os.path.join(self.sysfs_dir(), 'pid_target'), self.pid)
@@ -275,27 +275,27 @@ class DamonAttrs:
def stage(self):
err = write_file(os.path.join(self.interval_sysfs_dir(), 'sample_us'),
self.sample_us)
- if err != None:
+ if err is not None:
return err
err = write_file(os.path.join(self.interval_sysfs_dir(), 'aggr_us'),
self.aggr_us)
- if err != None:
+ if err is not None:
return err
err = write_file(os.path.join(self.interval_sysfs_dir(), 'update_us'),
self.update_us)
- if err != None:
+ if err is not None:
return err

err = write_file(
os.path.join(self.nr_regions_range_sysfs_dir(), 'min'),
self.min_nr_regions)
- if err != None:
+ if err is not None:
return err

err = write_file(
os.path.join(self.nr_regions_range_sysfs_dir(), 'max'),
self.max_nr_regions)
- if err != None:
+ if err is not None:
return err

class DamonCtx:
@@ -329,24 +329,24 @@ class DamonCtx:
def stage(self):
err = write_file(
os.path.join(self.sysfs_dir(), 'operations'), self.ops)
- if err != None:
+ if err is not None:
return err
err = self.monitoring_attrs.stage()
- if err != None:
+ if err is not None:
return err

nr_targets_file = os.path.join(
self.sysfs_dir(), 'targets', 'nr_targets')
content, err = read_file(nr_targets_file)
- if err != None:
+ if err is not None:
return err
if int(content) != len(self.targets):
err = write_file(nr_targets_file, '%d' % len(self.targets))
- if err != None:
+ if err is not None:
return err
for target in self.targets:
err = target.stage()
- if err != None:
+ if err is not None:
return err

nr_schemes_file = os.path.join(
@@ -356,11 +356,11 @@ class DamonCtx:
return err
if int(content) != len(self.schemes):
err = write_file(nr_schemes_file, '%d' % len(self.schemes))
- if err != None:
+ if err is not None:
return err
for scheme in self.schemes:
err = scheme.stage()
- if err != None:
+ if err is not None:
return err
return None

@@ -384,16 +384,16 @@ class Kdamond:
nr_contexts_file = os.path.join(self.sysfs_dir(),
'contexts', 'nr_contexts')
content, err = read_file(nr_contexts_file)
- if err != None:
+ if err is not None:
return err
if int(content) != len(self.contexts):
err = write_file(nr_contexts_file, '%d' % len(self.contexts))
- if err != None:
+ if err is not None:
return err

for context in self.contexts:
err = context.stage()
- if err != None:
+ if err is not None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'state'), 'on')
return err
@@ -401,20 +401,20 @@ class Kdamond:
def update_schemes_tried_bytes(self):
err = write_file(os.path.join(self.sysfs_dir(), 'state'),
'update_schemes_tried_bytes')
- if err != None:
+ if err is not None:
return err
for context in self.contexts:
for scheme in context.schemes:
content, err = read_file(os.path.join(scheme.sysfs_dir(),
'tried_regions', 'total_bytes'))
- if err != None:
+ if err is not None:
return err
scheme.tried_bytes = int(content)

def update_schemes_stats(self):
err = write_file(os.path.join(self.sysfs_dir(), 'state'),
'update_schemes_stats')
- if err != None:
+ if err is not None:
return err
for context in self.contexts:
for scheme in context.schemes:
@@ -423,7 +423,7 @@ class Kdamond:
'sz_applied', 'qt_exceeds']:
content, err = read_file(
os.path.join(scheme.sysfs_dir(), 'stats', stat))
- if err != None:
+ if err is not None:
return err
stat_values.append(int(content))
scheme.stats = DamosStats(*stat_values)
@@ -471,10 +471,10 @@ class Kdamonds:
def start(self):
err = write_file(os.path.join(self.sysfs_dir(), 'nr_kdamonds'),
'%s' % len(self.kdamonds))
- if err != None:
+ if err is not None:
return err
for kdamond in self.kdamonds:
err = kdamond.start()
- if err != None:
+ if err is not None:
return err
return None
--
2.39.2