linux-kernel - Re: [PATCH] perf script: introduce deltatime option

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Date:   Wed, 5 Feb 2020 10:14:14 +0100
From:   Hagen Paul Pfeifer <hagen@...u.net>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH] perf script: introduce deltatime option

* Andi Kleen | 2020-02-04 15:16:28 [-0800]:

>> $ perf script --deltatime
>
>It's already implemented as --reltime

Nope ;-)

$ perf script --ns --reltime
           sleep 49148 [000]     0.000000000: probe_libc:sbrk: (7f279d9144f0)
           sleep 49148 [000]     0.000009153: probe_libc:sbrk: (7f279d9144f0)
              sh 49151 [002]     0.099454082: probe_libc:sbrk: (7f9f1c6374f0)
              sh 49151 [002]     0.099468538: probe_libc:sbrk: (7f9f1c6374f0)
            curl 49153 [003]     0.114459574: probe_libc:sbrk: (7f9bb2dfb4f0)
            curl 49153 [003]     0.114474449: probe_libc:sbrk: (7f9bb2dfb4f0)
						[...]

$ perf script --ns --deltatime
           sleep 49148 [000]     0.000000000: probe_libc:sbrk: (7f279d9144f0)
           sleep 49148 [000]     0.000009153: probe_libc:sbrk: (7f279d9144f0)
              sh 49151 [002]     0.099444929: probe_libc:sbrk: (7f9f1c6374f0)
              sh 49151 [002]     0.000014456: probe_libc:sbrk: (7f9f1c6374f0)
            curl 49153 [003]     0.014991036: probe_libc:sbrk: (7f9bb2dfb4f0)
            curl 49153 [003]     0.000014875: probe_libc:sbrk: (7f9bb2dfb4f0)
						[...]


reltime is relative to the *first event* in the record - deltatime is relative
to the *previous* event.

Hagen