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bitbake: runqueue.py: fix PSI check logic

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The current calculation is not correct because if tdiff is less than
1.0, it's not taken into consideration when calculating the current
pressure.

Also, make it clear that the 1.0s is the psi accumulation cycle,
which might be changed in the future. We have this cycle because it
could largely avoid the 0 result issue, that is, if the interval
between checks are too small, the result might be 0. With this
accumulation logic, which has been there but let's make it clear,
this 0 result problem could be mitigated.

(Bitbake rev: 95fa8fb5fb4d5a72e79b11d69792613bfd494e72)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Chen Qi
2023-08-08 16:50:54 +08:00
committed by Richard Purdie
parent ac5512b0ac
commit 653ff4d85c
1 changed files with 5 additions and 4 deletions
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9
bitbake/lib/bb/runqueue.py
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@@ -200,7 +200,8 @@ class RunQueueScheduler(object):
curr_memory_pressure = memory_pressure_fds.readline().split()[4].split("=")[1]
now = time.time()
tdiff = now - self.prev_pressure_time
if tdiff > 1.0:
psi_accumulation_interval = 1.0
if tdiff > psi_accumulation_interval:
exceeds_cpu_pressure = self.rq.max_cpu_pressure and (float(curr_cpu_pressure) - float(self.prev_cpu_pressure)) / tdiff > self.rq.max_cpu_pressure
exceeds_io_pressure = self.rq.max_io_pressure and (float(curr_io_pressure) - float(self.prev_io_pressure)) / tdiff > self.rq.max_io_pressure
exceeds_memory_pressure = self.rq.max_memory_pressure and (float(curr_memory_pressure) - float(self.prev_memory_pressure)) / tdiff > self.rq.max_memory_pressure
@@ -209,9 +210,9 @@ class RunQueueScheduler(object):
self.prev_memory_pressure = curr_memory_pressure
self.prev_pressure_time = now
else:
exceeds_cpu_pressure = self.rq.max_cpu_pressure and (float(curr_cpu_pressure) - float(self.prev_cpu_pressure)) > self.rq.max_cpu_pressure
exceeds_io_pressure = self.rq.max_io_pressure and (float(curr_io_pressure) - float(self.prev_io_pressure)) > self.rq.max_io_pressure
exceeds_memory_pressure = self.rq.max_memory_pressure and (float(curr_memory_pressure) - float(self.prev_memory_pressure)) > self.rq.max_memory_pressure
exceeds_cpu_pressure = self.rq.max_cpu_pressure and (float(curr_cpu_pressure) - float(self.prev_cpu_pressure)) / tdiff > self.rq.max_cpu_pressure
exceeds_io_pressure = self.rq.max_io_pressure and (float(curr_io_pressure) - float(self.prev_io_pressure)) / tdiff > self.rq.max_io_pressure
exceeds_memory_pressure = self.rq.max_memory_pressure and (float(curr_memory_pressure) - float(self.prev_memory_pressure)) / tdiff > self.rq.max_memory_pressure
pressure_state = (exceeds_cpu_pressure, exceeds_io_pressure, exceeds_memory_pressure)
if hasattr(self, "pressure_state") and pressure_state != self.pressure_state:
bb.note("Pressure status changed to CPU: %s, IO: %s, Mem: %s" % pressure_state)