From: Jiri Olsa <jolsa@redhat•com>
To: "Paul A. Clarke" <pc@us•ibm.com>
Cc: Ian Rogers <irogers@google•com>,
Peter Zijlstra <peterz@infradead•org>,
Ingo Molnar <mingo@redhat•com>,
Arnaldo Carvalho de Melo <acme@kernel•org>,
Mark Rutland <mark.rutland@arm•com>,
Alexander Shishkin <alexander.shishkin@linux•intel.com>,
Namhyung Kim <namhyung@kernel•org>,
Alexei Starovoitov <ast@kernel•org>,
Daniel Borkmann <daniel@iogearbox•net>,
Martin KaFai Lau <kafai@fb•com>, Song Liu <songliubraving@fb•com>,
Yonghong Song <yhs@fb•com>, Andrii Nakryiko <andriin@fb•com>,
John Fastabend <john.fastabend@gmail•com>,
KP Singh <kpsingh@chromium•org>, Kajol Jain <kjain@linux•ibm.com>,
Andi Kleen <ak@linux•intel.com>,
John Garry <john.garry@huawei•com>,
Jin Yao <yao.jin@linux•intel.com>,
Kan Liang <kan.liang@linux•intel.com>,
Cong Wang <xiyou.wangcong@gmail•com>,
Kim Phillips <kim.phillips@amd•com>,
Adrian Hunter <adrian.hunter@intel•com>,
Leo Yan <leo.yan@linaro•org>,
linux-kernel@vger•kernel.org, netdev@vger•kernel.org,
bpf@vger•kernel.org, Stephane Eranian <eranian@google•com>,
Arnaldo Carvalho de Melo <acme@redhat•com>
Subject: Re: metric expressions including metrics?
Date: Mon, 18 May 2020 21:20:51 +0200 [thread overview]
Message-ID: <20200518192051.GE11620@krava> (raw)
In-Reply-To: <20200518191242.GA27634@oc3272150783.ibm.com>
On Mon, May 18, 2020 at 02:12:42PM -0500, Paul A. Clarke wrote:
> I'm curious how hard it would be to define metrics using other metrics,
> in the metrics definition files.
>
> Currently, to my understanding, every metric definition must be an
> expresssion based solely on arithmetic combinations of hardware events.
>
> Some metrics are hierarchical in nature such that a higher-level metric
> can be defined as an arithmetic expression of two other metrics, e.g.
>
> cache_miss_cycles_per_instruction =
> data_cache_miss_cycles_per_instruction +
> instruction_cache_miss_cycles_per_instruction
>
> This would need to be defined something like:
> dcache_miss_cpi = "dcache_miss_cycles / instructions"
> icache_miss_cpi = "icache_miss_cycles / instructions"
> cache_miss_cpi = "(dcache_miss_cycles + icache_miss_cycles) / instructions"
>
> Could the latter definition be simplified to:
> cache_miss_cpi = "dcache_miss_cpi + icache_miss_cpi"
>
> With multi-level caches and NUMA hierarchies, some of these higher-level
> metrics can involve a lot of hardware events.
>
> Given the recent activity in this area, I'm curious if this has been
> considered and already on a wish/to-do list, or found onerous.
hi,
actually we were discussing this with Ian and Stephane and I plan on
checking on that.. should be doable, I'll keep you in the loop
jirka
>
> Regards,
> Paul Clarke
>
next prev parent reply other threads:[~2020-05-18 19:21 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-18 19:12 metric expressions including metrics? Paul A. Clarke
2020-05-18 19:20 ` Jiri Olsa [this message]
2020-05-18 19:24 ` Stephane Eranian
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