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From 1dd72d9db74b063c8dd96f13701a14e299abc325 Mon Sep 17 00:00:00 2001
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From: John Kacur <jkacur@redhat.com>
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Date: Thu, 28 Oct 2021 00:50:12 -0400
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Subject: [PATCH 1/2] tuna: Print warning if setting affinity results in EBUSY
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and continue
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When trying to isolate a CPU, if a device uses SCHED_DEADLINE and admission
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control is enabled, setting the affinity will result in the error EBUSY.
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tuna should print a warning that this pid could not be moved, and
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continue.
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The user can either ignore the warning or use other measures to isolate
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the cpu such as booting with isolcpus or turning off admission control
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and rerunning the tuna isolate command and then turning admission
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control back on.
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Signed-off-by: John Kacur <jkacur@redhat.com>
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---
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tuna/tuna.py | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/tuna/tuna.py b/tuna/tuna.py
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index 591206d9b4e1..f25eb3d10923 100755
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--- a/tuna/tuna.py
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+++ b/tuna/tuna.py
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@@ -360,6 +360,10 @@ def isolate_cpus(cpus, nr_cpus):
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if err.args[0] == errno.EINVAL:
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print("Function:", fname, ",", err.strerror, file=sys.stderr)
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sys.exit(2)
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+ if err.args[0] == errno.EBUSY:
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+ comm = ps[pid].stat["comm"]
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+ print(f'Warning: Unable to isolate pid {pid} [{comm}]')
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+ continue
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raise err
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if "threads" not in ps[pid]:
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--
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2.31.1
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