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diff -up iotop-0.6/iotop/data.py.gitab35334d iotop-0.6/iotop/data.py
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--- iotop-0.6/iotop/data.py.gitab35334d 2022-02-15 21:51:20.828263067 +0100
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+++ iotop-0.6/iotop/data.py 2022-02-15 21:51:20.830263041 +0100
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@@ -453,3 +453,11 @@ class ProcessList(DumpableObject):
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def clear(self):
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self.processes = {}
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+
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+
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+def sysctl_task_delayacct():
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+ try:
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+ with open('/proc/sys/kernel/task_delayacct') as f:
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+ return bool(int(f.read().strip()))
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+ except FileNotFoundError:
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+ return None
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diff -up iotop-0.6/iotop/ui.py.gitab35334d iotop-0.6/iotop/ui.py
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--- iotop-0.6/iotop/ui.py.gitab35334d 2022-02-15 21:51:20.828263067 +0100
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+++ iotop-0.6/iotop/ui.py 2022-02-15 21:51:56.415788740 +0100
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@@ -30,7 +30,7 @@ import signal
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import sys
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import time
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-from iotop.data import find_uids, TaskStatsNetlink, ProcessList, Stats
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+from iotop.data import find_uids, TaskStatsNetlink, ProcessList, Stats, sysctl_task_delayacct
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from iotop.data import ThreadInfo
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from iotop.version import VERSION
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from iotop import ioprio
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@@ -377,7 +377,7 @@ class IOTopUI(object):
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def format(p):
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stats = format_stats(self.options, p, self.process_list.duration)
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io_delay, swapin_delay, read_bytes, write_bytes = stats
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- if Stats.has_blkio_delay_total:
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+ if self.has_swapin_io:
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delay_stats = '%7s %7s ' % (swapin_delay, io_delay)
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else:
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delay_stats = ' ?unavailable? '
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@@ -431,6 +431,14 @@ class IOTopUI(object):
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pid += 'TID'
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titles = [pid, ' PRIO', ' USER', ' DISK READ', ' DISK WRITE',
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' SWAPIN', ' IO', ' COMMAND']
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+ self.has_swapin_io = Stats.has_blkio_delay_total
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+ if self.has_swapin_io:
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+ # Linux kernels without the sysctl return None and
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+ # iotop just uses the heuristic for those versions.
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+ # Linux kernels with the sysctl return True or False
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+ # and iotop then uses the sysctl value instead.
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+ if sysctl_task_delayacct() == False:
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+ self.has_swapin_io = False
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lines = self.get_data()
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if self.options.time:
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titles = [' TIME'] + titles
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@@ -464,7 +472,7 @@ class IOTopUI(object):
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title = title[:remaining_cols]
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remaining_cols -= len(title)
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self.win.addstr(title, attr)
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- if Stats.has_blkio_delay_total:
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+ if self.has_swapin_io:
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status_msg = None
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else:
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status_msg = ('CONFIG_TASK_DELAY_ACCT '
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