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From 4790e570ce0e41bde4e1866ed6e3cba723b5f4d8 Mon Sep 17 00:00:00 2001
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From: Marcelo Tosatti <mtosatti@redhat.com>
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Date: Wed, 4 Jul 2018 17:30:37 -0300
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Subject: [PATCH] realtime-virtual-host: pin only the vcpu thread to isolated
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pCPU (v2)
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As noted in the bugzilla ticket
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https://bugzilla.redhat.com/show_bug.cgi?id=1554851
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The QEMU I/O thread can interrupt the time measurement
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of the timer. To avoid this problem, only
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pin the vCPU thread.
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Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Reviewed-and-Tested-by: Luiz Capitulino <lcapitulino@redhat.com>
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v2:
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- Use unix sockets (Luiz)
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- Proper numeric output (Luiz)
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---
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profiles/realtime-virtual-host/script.sh | 31 ++++++++++++++++--------
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1 file changed, 21 insertions(+), 10 deletions(-)
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diff --git a/profiles/realtime-virtual-host/script.sh b/profiles/realtime-virtual-host/script.sh
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index 515d2547..32e962db 100755
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--- a/profiles/realtime-virtual-host/script.sh
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+++ b/profiles/realtime-virtual-host/script.sh
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@@ -17,20 +17,31 @@ run_tsc_deadline_latency()
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for i in `seq 1000 500 7000`; do
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echo $i > $KVM_LAPIC_FILE
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- chrt -f 1 taskset -c $1 $QEMU -enable-kvm -device pc-testdev \
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+
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+ unixpath=`mktemp`
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+
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+ chrt -f 1 $QEMU -S -enable-kvm -device pc-testdev \
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-device isa-debug-exit,iobase=0xf4,iosize=0x4 \
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-display none -serial stdio -device pci-testdev \
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-kernel "$TSCDEADLINE_LATENCY" \
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- -cpu host | grep latency | cut -f 2 -d ":" > $dir/out
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-
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- if [ ! -f $dir/out ]; then
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- die running $TSCDEADLINE_LATENCY failed
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- fi
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+ -cpu host \
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+ -mon chardev=char0,mode=readline \
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+ -chardev socket,id=char0,nowait,path=$unixpath,server | grep latency | cut -f 2 -d ":" > $dir/out &
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+
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+ sleep 1s
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+ pidofvcpu=`echo "info cpus" | nc -U $unixpath | grep thread_id | cut -f 3 -d "=" | tr -d "\r"`
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+ taskset -p -c $1 $pidofvcpu >/dev/null
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+ echo "cont" | nc -U $unixpath >/dev/null
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+ wait
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+
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+ if [ ! -f $dir/out ]; then
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+ die running $TSCDEADLINE_LATENCY failed
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+ fi
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- tmp=$(wc -l $dir/out | awk '{ print $1 }')
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- if [ $tmp -eq 0 ]; then
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- die running $TSCDEADLINE_LATENCY failed
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- fi
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+ tmp=$(wc -l $dir/out | awk '{ print $1 }')
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+ if [ $tmp -eq 0 ]; then
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+ die running $TSCDEADLINE_LATENCY failed
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+ fi
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A=0
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while read l; do
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