From: Andi Kleen <ak@linux.intel.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: "David Ahern" <dsahern@gmail.com>,
peterz@infradead.org, "Jiri Olsa" <jolsa@kernel.org>,
"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>,
"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: Fri, 31 Jul 2020 08:36:12 -0700 [thread overview]
Message-ID: <20200731153612.GC1299820@tassilo.jf.intel.com> (raw)
In-Reply-To: <20200731074726.GA1485940@krava>
> yep, we have a customer that needs to compare data from multiple servers
It's also needed to correlate over different guests on the same machine.
This is an important use case.
It would be nice if we could find a way to export the per guest
TSC offset from KVM, then we could use the more reliable TSC for this,
at least as long as no TSC scaling is used.
But failing that wall clock is probably the best you can do.
-Andi
next prev parent reply other threads:[~2020-07-31 15:36 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
2020-07-31 7:47 ` Jiri Olsa
2020-07-31 15:36 ` Andi Kleen [this message]
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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