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# SPDX-License-Identifier: GPL-2.0
import os
sysfs_root = '/sys/kernel/mm/damon/admin'
def write_file(path, string):
"Returns error string if failed, or None otherwise"
string = '%s' % string
try:
with open(path, 'w') as f:
f.write(string)
except Exception as e:
return '%s' % e
return None
def read_file(path):
'''Returns the read content and error string. The read content is None if
the reading failed'''
try:
with open(path, 'r') as f:
return f.read(), None
except Exception as e:
return None, '%s' % e
class DamosAccessPattern:
size = None
nr_accesses = None
age = None
scheme = None
def __init__(self, size=None, nr_accesses=None, age=None):
self.size = size
self.nr_accesses = nr_accesses
self.age = age
if self.size == None:
self.size = [0, 2**64 - 1]
if self.nr_accesses == None:
self.nr_accesses = [0, 2**64 - 1]
if self.age == None:
self.age = [0, 2**64 - 1]
def sysfs_dir(self):
return os.path.join(self.scheme.sysfs_dir(), 'access_pattern')
def stage(self):
err = write_file(
os.path.join(self.sysfs_dir(), 'sz', 'min'), self.size[0])
if err != None:
return err
err = write_file(
os.path.join(self.sysfs_dir(), 'sz', 'max'), self.size[1])
if err != None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'nr_accesses', 'min'),
self.nr_accesses[0])
if err != None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'nr_accesses', 'max'),
self.nr_accesses[1])
if err != None:
return err
err = write_file(
os.path.join(self.sysfs_dir(), 'age', 'min'), self.age[0])
if err != None:
return err
err = write_file(
os.path.join(self.sysfs_dir(), 'age', 'max'), self.age[1])
if err != None:
return err
class Damos:
action = None
access_pattern = None
# todo: Support quotas, watermarks, stats, tried_regions
idx = None
context = None
tried_bytes = None
def __init__(self, action='stat', access_pattern=DamosAccessPattern()):
self.action = action
self.access_pattern = access_pattern
self.access_pattern.scheme = self
def sysfs_dir(self):
return os.path.join(
self.context.sysfs_dir(), 'schemes', '%d' % self.idx)
def stage(self):
err = write_file(os.path.join(self.sysfs_dir(), 'action'), self.action)
if err != None:
return err
err = self.access_pattern.stage()
if err != None:
return err
# disable quotas
err = write_file(os.path.join(self.sysfs_dir(), 'quotas', 'ms'), '0')
if err != None:
return err
err = write_file(
os.path.join(self.sysfs_dir(), 'quotas', 'bytes'), '0')
if err != None:
return err
# disable watermarks
err = write_file(
os.path.join(self.sysfs_dir(), 'watermarks', 'metric'), 'none')
if err != None:
return err
# disable filters
err = write_file(
os.path.join(self.sysfs_dir(), 'filters', 'nr_filters'), '0')
if err != None:
return err
class DamonTarget:
pid = None
# todo: Support target regions if test is made
idx = None
context = None
def __init__(self, pid):
self.pid = pid
def sysfs_dir(self):
return os.path.join(
self.context.sysfs_dir(), 'targets', '%d' % self.idx)
def stage(self):
err = write_file(
os.path.join(self.sysfs_dir(), 'regions', 'nr_regions'), '0')
if err != None:
return err
return write_file(
os.path.join(self.sysfs_dir(), 'pid_target'), self.pid)
class DamonAttrs:
sample_us = None
aggr_us = None
update_us = None
min_nr_regions = None
max_nr_regions = None
context = None
def __init__(self, sample_us=5000, aggr_us=100000, update_us=1000000,
min_nr_regions=10, max_nr_regions=1000):
self.sample_us = sample_us
self.aggr_us = aggr_us
self.update_us = update_us
self.min_nr_regions = min_nr_regions
self.max_nr_regions = max_nr_regions
def interval_sysfs_dir(self):
return os.path.join(self.context.sysfs_dir(), 'monitoring_attrs',
'intervals')
def nr_regions_range_sysfs_dir(self):
return os.path.join(self.context.sysfs_dir(), 'monitoring_attrs',
'nr_regions')
def stage(self):
err = write_file(os.path.join(self.interval_sysfs_dir(), 'sample_us'),
self.sample_us)
if err != None:
return err
err = write_file(os.path.join(self.interval_sysfs_dir(), 'aggr_us'),
self.aggr_us)
if err != None:
return err
err = write_file(os.path.join(self.interval_sysfs_dir(), 'update_us'),
self.update_us)
if err != None:
return err
err = write_file(
os.path.join(self.nr_regions_range_sysfs_dir(), 'min'),
self.min_nr_regions)
if err != None:
return err
err = write_file(
os.path.join(self.nr_regions_range_sysfs_dir(), 'max'),
self.max_nr_regions)
if err != None:
return err
class DamonCtx:
ops = None
monitoring_attrs = None
targets = None
schemes = None
kdamond = None
idx = None
def __init__(self, ops='paddr', monitoring_attrs=DamonAttrs(), targets=[],
schemes=[]):
self.ops = ops
self.monitoring_attrs = monitoring_attrs
self.monitoring_attrs.context = self
self.targets = targets
for idx, target in enumerate(self.targets):
target.idx = idx
target.context = self
self.schemes = schemes
for idx, scheme in enumerate(self.schemes):
scheme.idx = idx
scheme.context = self
def sysfs_dir(self):
return os.path.join(self.kdamond.sysfs_dir(), 'contexts',
'%d' % self.idx)
def stage(self):
err = write_file(
os.path.join(self.sysfs_dir(), 'operations'), self.ops)
if err != None:
return err
err = self.monitoring_attrs.stage()
if err != 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:
return err
if int(content) != len(self.targets):
err = write_file(nr_targets_file, '%d' % len(self.targets))
if err != None:
return err
for target in self.targets:
err = target.stage()
if err != None:
return err
nr_schemes_file = os.path.join(
self.sysfs_dir(), 'schemes', 'nr_schemes')
content, err = read_file(nr_schemes_file)
if int(content) != len(self.schemes):
err = write_file(nr_schemes_file, '%d' % len(self.schemes))
if err != None:
return err
for scheme in self.schemes:
err = scheme.stage()
if err != None:
return err
return None
class Kdamond:
state = None
pid = None
contexts = None
idx = None # index of this kdamond between siblings
kdamonds = None # parent
def __init__(self, contexts=[]):
self.contexts = contexts
for idx, context in enumerate(self.contexts):
context.idx = idx
context.kdamond = self
def sysfs_dir(self):
return os.path.join(self.kdamonds.sysfs_dir(), '%d' % self.idx)
def start(self):
nr_contexts_file = os.path.join(self.sysfs_dir(),
'contexts', 'nr_contexts')
content, err = read_file(nr_contexts_file)
if err != None:
return err
if int(content) != len(self.contexts):
err = write_file(nr_contexts_file, '%d' % len(self.contexts))
if err != None:
return err
for context in self.contexts:
err = context.stage()
if err != None:
return err
err = write_file(os.path.join(self.sysfs_dir(), 'state'), 'on')
return err
def update_schemes_tried_bytes(self):
err = write_file(os.path.join(self.sysfs_dir(), 'state'),
'update_schemes_tried_bytes')
if err != 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:
return err
scheme.tried_bytes = int(content)
class Kdamonds:
kdamonds = []
def __init__(self, kdamonds=[]):
self.kdamonds = kdamonds
for idx, kdamond in enumerate(self.kdamonds):
kdamond.idx = idx
kdamond.kdamonds = self
def sysfs_dir(self):
return os.path.join(sysfs_root, 'kdamonds')
def start(self):
err = write_file(os.path.join(self.sysfs_dir(), 'nr_kdamonds'),
'%s' % len(self.kdamonds))
if err != None:
return err
for kdamond in self.kdamonds:
err = kdamond.start()
if err != None:
return err
return None
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