From: Stefano De Venuto <stefano.devenuto99@gmail.com>
To: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>,
rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org, Dario Faggioli <dfaggioli@suse.com>
Subject: Re: [PATCH v32 0/5]Timestamp synchronization of host - guest tracing session
Date: Fri, 19 Mar 2021 11:08:45 +0100 [thread overview]
Message-ID: <6796a75b-6a59-767f-08ec-ee0cbfd8c825@gmail.com> (raw)
In-Reply-To: <20210315061857.168570-1-tz.stoyanov@gmail.com>
Hello,
On 3/15/21 7:18 AM, Tzvetomir Stoyanov (VMware) wrote:
> Basic infrastructure for host - guest timestamp synchronization and a
> PoC implementation of PTP-like and KVM algorithms.
I'm trying to make some analysis on traces generated by host and guest,
so I applied this series and the related dependencies.
However, when the KVM algorithm is used, the merging process
of the two traces doesn't seem to happen properly.
The output of `trace-cmd report -i trace.dat -i trace-tumbleweed.dat` is:
trace.dat: cpus=4
trace-tumbleweed.dat: cpus=1
trace.dat: sleep-23948 [002]61124758463654:
write_msr: c0000100, value 7f35092875c0
trace.dat: <idle>-0 [000]61124760841508:
write_msr: c0000100, value 7f6136b75640
trace.dat: CPU 0/KVM-1640 [000]61124760851620:
write_msr: c0011020, value 40000000000000
trace.dat: CPU 0/KVM-1640 [000]61124760861778:
read_msr: c0000101, value ffff9b1b76c00000
trace.dat: CPU 0/KVM-1640 [000]61124760862832:
read_msr: c0000081, value 23001000000000
trace.dat: CPU 0/KVM-1640 [000]61124760864347:
read_msr: c0000082, value ffffffffb5400010
trace.dat: CPU 0/KVM-1640 [000]61124760865225:
read_msr: c0000083, value ffffffffb5401670
.
.
.
trace-tumbleweed.dat: IPC I/O Parent-4313 [000]8446232460209009653:
write_msr: c0000100, value 7f94535c7640
trace-tumbleweed.dat: IPC I/O Child-4503 [000]8446348845232796661:
write_msr: c001011f, value 4
trace-tumbleweed.dat: IPC I/O Child-4503 [000]8447532508154803189:
write_msr: c0000100, value 7f945e8d5780
trace-tumbleweed.dat: <idle>-0 [000]8452336523564659701:
write_msr: c001011f, value 0
trace-tumbleweed.dat: <idle>-0 [000]8452515224268944373:
write_msr: 6e0, value 731478a3bf62
trace-tumbleweed.dat: <idle>-0 [000]8452610851715789813:
write_msr: 6e0, value 731478968f37
trace-tumbleweed.dat: <idle>-0 [000]8555757214338495477:
write_msr: 6e0, value 731478853ec1
trace-tumbleweed.dat: <idle>-0 [000]8555904475882173429:
write_msr: 6e0, value 7314778a60e8
trace-tumbleweed.dat: kworker/0:1-7351 [000]8556355589182174197:
write_msr: c0000100, value 7f8373573740
The TimeShift information is inside the guest trace file,
so I think this is not a transfer problem.
I also tried to remove the last patch, the one related to the KVM clock,
in order to use PTP and the two traces are merged correctly.
The commands used to record are:
Host:
# trace-cmd record -C x86-tsc -e kvm:* -e msr:* -A tumbleweed:823 -e
msr:* -C x86-tsc sleep 1
Guest:
# echo x86-tsc > /sys/kernel/tracing/trace_clock
# trace-cmd agent
Am I doing something wrong?
If necessary, I can provide more info about my setup, or do more tests.
Thanks and Regards,
Stefano
next prev parent reply other threads:[~2021-03-19 10:09 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 6:18 [PATCH v32 0/5]Timestamp synchronization of host - guest tracing session Tzvetomir Stoyanov (VMware)
2021-03-15 6:18 ` [PATCH v32 1/5] trace-cmd: Add dummy function to initialize timestamp sync logic Tzvetomir Stoyanov (VMware)
2021-03-15 6:18 ` [PATCH v32 2/5] trace-cmd: Add timestamp synchronization per vCPU Tzvetomir Stoyanov (VMware)
2021-03-15 6:18 ` [PATCH v32 3/5] trace-cmd: PTP-like algorithm for host - guest timestamp synchronization Tzvetomir Stoyanov (VMware)
2021-03-15 6:18 ` [PATCH v32 4/5] trace-cmd: Debug scripts for " Tzvetomir Stoyanov (VMware)
2021-03-15 6:18 ` [PATCH v32 5/5] trace-cmd [POC]: Add KVM timestamp synchronization plugin Tzvetomir Stoyanov (VMware)
2021-03-19 10:08 ` Stefano De Venuto [this message]
2021-03-19 11:55 ` [PATCH v32 0/5]Timestamp synchronization of host - guest tracing session Tzvetomir Stoyanov
2021-03-19 17:44 ` Stefano De Venuto
2021-03-20 6:25 ` Tzvetomir Stoyanov
[not found] ` <0f6e158c-43a3-4117-2a17-5a13cd6a7970@gmail.com>
2021-03-22 10:13 ` Tzvetomir Stoyanov
2021-03-22 14:56 ` Steven Rostedt
2021-03-25 20:55 ` Dario Faggioli
2021-03-25 7:20 ` Tzvetomir Stoyanov
2021-03-25 18:01 ` Stefano De Venuto
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