linux-kernel - Re: [PATCH v3 0/7] perf cs_etm: Basic support for virtual/kernel timestamps

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Message-ID: <4e6a0766-52d1-effa-9986-af6b3ca29f1a@arm.com>
Date:   Wed, 11 Jan 2023 11:35:04 +0000
From:   James Clark <james.clark@....com>
To:     Tanmay Jagdale <tanmay@...vell.com>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
        "leo.yan@...aro.org" <leo.yan@...aro.org>,
        "mike.leach@...aro.org" <mike.leach@...aro.org>
Cc:     Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        George Cherian <gcherian@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Bharat Bhushan <bbhushan2@...vell.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        "coresight@...ts.linaro.org" <coresight@...ts.linaro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/7] perf cs_etm: Basic support for virtual/kernel
 timestamps



On 10/01/2023 16:42, Tanmay Jagdale wrote:
> Hi James,
> 
[...]

>> base-commit: 09e6f9f98370be9a9f8978139e0eb1be87d1125f
> I have tested this patch set on our platform and able to see updated
> timestamp values in perf script's output.
> 
> $ perf record -e cs_etm/cycacc,@tmc_etr0/k -C 9 taskset -c 9 sleep 2
> $ perf script --itrace=i1ns --ns -Fcomm,tid,pid,time,cpu,event,ip,sym,addr,symoff,flags,callindent
> 
> At certain points noticed that hardware emits same timestamp packets
> but with updated cycle count (CC) values. A small snippet of the log:
> 
> Idx:100; ID:12; I_ADDR_S_IS0 : Address, Short, IS0.; Addr=0xFFFF8000086A761C ~[0x761C]
> Idx:103; ID:12; I_TIMESTAMP : Timestamp.; Updated val = 0x2f373e37e02; CC=0x3d
> Idx:107; ID:12; I_ATOM_F2 : Atom format 2.; EN
> Idx:108; ID:12; I_TIMESTAMP : Timestamp.; Updated val = 0x2f373e37e02; CC=0x3f
> Idx:112; ID:12; I_ATOM_F1 : Atom format 1.; N
> Idx:113; ID:12; I_TIMESTAMP : Timestamp.; Updated val = 0x2f373e37e02; CC=0x45
> Idx:116; ID:12; I_ATOM_F1 : Atom format 1.; E
> Idx:117; ID:12; I_ADDR_S_IS0 : Address, Short, IS0.; Addr=0xFFFF8000086B52D4 ~[0x152D4]

Hi Tanmay,

Are you able to email or send a download link with the perf archive and
perf.data file of this recording please?

Thanks
James