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From 1ab378cc4a4372ca031bb765f656ab463b28af88 Mon Sep 17 00:00:00 2001
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From: Luiz Capitulino <lcapitulino@redhat.com>
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Date: Fri, 19 May 2017 15:10:19 -0400
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Subject: [PATCH] realtime-virtual-guest: re-assign kernel thread priorities
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From 63e5ebfe0c71c5e6d0613c4d8327b2a6f3fba7ba Mon Sep 17 00:00:00 2001
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From: Luiz Capitulino <lcapitulino@redhat.com>
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Date: Fri, 19 May 2017 14:42:06 -0400
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Subject:
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The realtime guest profile uses the RT kernel default priority
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assignment for the ksoftird, rcuc, and ktimersoftd kernel threads,
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which is:
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17 FF 2 [rcuc/1] *
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19 FF 1 [ktimersoftd/1] *
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20 TS - [ksoftirqd/1] *
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This doesn't allow running a PMD thread with fifo:1 in the
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guest, since this will starve ktimersoftd and ksoftirqd if
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those threads ever become runnable.
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The solution is to use the same priority assigment we use
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in the host where we've been running PMD threads with
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fifo:1 priorities without problems. This assignment is:
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151 FF 4 [rcuc/15] *
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153 FF 3 [ktimersoftd/15] *
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154 FF 2 [ksoftirqd/15] *
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This patch just copies the [scheduler] section from the
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host profile.
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Resolves: rhbz#1452357
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Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
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---
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profiles/realtime-virtual-guest/tuned.conf | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/profiles/realtime-virtual-guest/tuned.conf b/profiles/realtime-virtual-guest/tuned.conf
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index 71085a8..0992fbd 100644
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--- a/profiles/realtime-virtual-guest/tuned.conf
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+++ b/profiles/realtime-virtual-guest/tuned.conf
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@@ -20,6 +20,20 @@ isolated_cores_present_expanded=${f:cpulist_present:${isolated_cores}}
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# Fail if isolated_cores contains CPUs which are not present
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assert2=${f:assertion:isolated_cores contains present CPU(s):${isolated_cores_expanded}:${isolated_cores_present_expanded}}
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+[scheduler]
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+# group.group_name=rule_priority:scheduler_policy:scheduler_priority:core_affinity_in_hex:process_name_regex
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+# for i in `pgrep ksoftirqd` ; do grep Cpus_allowed_list /proc/$i/status ; done
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+group.ksoftirqd=0:f:2:*:ksoftirqd.*
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+
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+# for i in `pgrep rcuc` ; do grep Cpus_allowed_list /proc/$i/status ; done
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+group.rcuc=0:f:4:*:rcuc.*
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+
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+# for i in `pgrep rcub` ; do grep Cpus_allowed_list /proc/$i/status ; done
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+group.rcub=0:f:4:*:rcub.*
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+
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+# for i in `pgrep ktimersoftd` ; do grep Cpus_allowed_list /proc/$i/status ; done
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+group.ktimersoftd=0:f:3:*:ktimersoftd.*
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+
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[script]
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script=${i:PROFILE_DIR}/script.sh
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