From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>, Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Andi Kleen <ak@linux.intel.com>, Ian Rogers <irogers@google.com>,
Stephane Eranian <eranian@google.com>,
Changbin Du <changbin.du@gmail.com>
Subject: Re: [PATCH 1/2] perf ftrace: Add -n/--use-nsec option for latency
Date: Tue, 22 Mar 2022 17:42:57 -0300 [thread overview]
Message-ID: <Yjo00URy0mhUnNxL@kernel.org> (raw)
In-Reply-To: <20220321234609.90455-1-namhyung@kernel.org>
Em Mon, Mar 21, 2022 at 04:46:08PM -0700, Namhyung Kim escreveu:
> Sometimes we want to see nano-second granularity.
>
> $ sudo perf ftrace latency -T dput -a -n sleep 1
> # DURATION | COUNT | GRAPH |
> 0 - 1 us | 0 | |
> 1 - 2 ns | 0 | |
> 2 - 4 ns | 0 | |
> 4 - 8 ns | 0 | |
> 8 - 16 ns | 0 | |
> 16 - 32 ns | 0 | |
> 32 - 64 ns | 0 | |
> 64 - 128 ns | 1163434 | ############## |
> 128 - 256 ns | 914102 | ############# |
> 256 - 512 ns | 884 | |
> 512 - 1024 ns | 613 | |
> 1 - 2 us | 31 | |
> 2 - 4 us | 17 | |
> 4 - 8 us | 7 | |
> 8 - 16 us | 123 | |
Thanks, applied.
- Arnaldo
prev parent reply other threads:[~2022-03-22 20:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-21 23:46 [PATCH 1/2] perf ftrace: Add -n/--use-nsec option for latency Namhyung Kim
2022-03-21 23:46 ` [PATCH 2/2] perf ftrace: Update documentation of ftrace command Namhyung Kim
2022-03-22 20:42 ` Arnaldo Carvalho de Melo [this message]
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