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Date: Mon, 18 May 2020 21:20:51 +0200 From: Jiri Olsa <jolsa@...hat.com> To: "Paul A. Clarke" <pc@...ibm.com> Cc: Ian Rogers <irogers@...gle.com>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Namhyung Kim <namhyung@...nel.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, Andrii Nakryiko <andriin@...com>, John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...omium.org>, Kajol Jain <kjain@...ux.ibm.com>, Andi Kleen <ak@...ux.intel.com>, John Garry <john.garry@...wei.com>, Jin Yao <yao.jin@...ux.intel.com>, Kan Liang <kan.liang@...ux.intel.com>, Cong Wang <xiyou.wangcong@...il.com>, Kim Phillips <kim.phillips@....com>, Adrian Hunter <adrian.hunter@...el.com>, Leo Yan <leo.yan@...aro.org>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, bpf@...r.kernel.org, Stephane Eranian <eranian@...gle.com>, Arnaldo Carvalho de Melo <acme@...hat.com> Subject: Re: metric expressions including metrics? 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 >
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