From: David Ahern <dsahern@gmail.com>
To: peterz@infradead.org, Jiri Olsa <jolsa@kernel.org>
Cc: "Arnaldo Carvalho de Melo" <acme@kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Namhyung Kim" <namhyung@kernel.org>,
"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
"Michael Petlan" <mpetlan@redhat.com>,
"Ian Rogers" <irogers@google.com>,
"Andi Kleen" <ak@linux.intel.com>,
"Geneviève Bastien" <gbastien@versatic.net>,
"Wang Nan" <wangnan0@huawei.com>,
"Jeremie Galarneau" <jgalar@efficios.com>
Subject: Re: [PATCH 0/6] perf tools: Add wallclock time conversion support
Date: Thu, 30 Jul 2020 19:21:54 -0600 [thread overview]
Message-ID: <a59b833f-bcb7-3d1b-6e0c-8758b47b93a3@gmail.com> (raw)
In-Reply-To: <20200730221423.GH2638@hirez.programming.kicks-ass.net>
On 7/30/20 4:14 PM, peterz@infradead.org wrote:
> On Thu, Jul 30, 2020 at 11:39:44PM +0200, Jiri Olsa wrote:
>
>> The patchset is adding the ability to display TOD/wallclock timestamp
>> in 'perf script' output and in 'perf data convert --to-ctf' subcommand,
>> so the converted CTF data contain TOD/wallclock timestamps.
>
> But why? Wallclock is a horrible piece of crap. Why would you want to do
> this?
>
Same reason I brought this up 9+ years ago: userspace lives on
time-of-day, and troubleshooting is based on correlating timestamps from
multiple sources. To correlate a perf event to syslog or an application
log, we need time-of-day.
next prev parent reply other threads:[~2020-07-31 1:22 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-30 21:39 [PATCH 0/6] perf tools: Add wallclock time conversion support Jiri Olsa
2020-07-30 21:39 ` [PATCH 1/6] perf tools: Add clockid_name function Jiri Olsa
2020-07-31 15:33 ` Andi Kleen
2020-07-31 16:19 ` Jiri Olsa
2020-07-30 21:39 ` [PATCH 2/6] perf tools: Store clock references for -k/--clockid option Jiri Olsa
2020-07-31 15:52 ` Alexey Budankov
2020-07-31 16:15 ` Jiri Olsa
2020-07-31 16:35 ` David Ahern
2020-08-03 3:55 ` Namhyung Kim
2020-08-03 11:35 ` Jiri Olsa
2020-07-30 21:39 ` [PATCH 3/6] perf tools: Move clockid_res_ns under clock struct Jiri Olsa
2020-07-30 21:39 ` [PATCH 4/6] perf tools: Add support to store time of day in CTF data conversion Jiri Olsa
2020-08-03 4:00 ` Namhyung Kim
2020-08-03 11:31 ` Jiri Olsa
2020-07-30 21:39 ` [PATCH 5/6] perf script: Change enum perf_output_field values to be 64 bits Jiri Olsa
2020-07-30 21:39 ` [PATCH 6/6] perf script: Add tod field to display time of day Jiri Olsa
2020-07-30 22:14 ` [PATCH 0/6] perf tools: Add wallclock time conversion support peterz
2020-07-31 1:21 ` David Ahern [this message]
2020-07-31 7:47 ` Jiri Olsa
2020-07-31 15:36 ` Andi Kleen
2020-07-31 18:05 ` peterz
2020-08-01 0:46 ` David Ahern
2020-08-01 17:49 ` Arnaldo Carvalho de Melo
2020-07-31 17:20 ` peterz
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