From: Andi Kleen <ak@linux.intel.com> To: Ian Rogers <irogers@google.com> Cc: 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>, Jiri Olsa <jolsa@redhat.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>, 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>, LKML <linux-kernel@vger.kernel.org>, Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>, linux-perf-users <linux-perf-users@vger.kernel.org>, Stephane Eranian <eranian@google.com> Subject: Re: [RFC PATCH 0/7] Share events between metrics Date: Thu, 7 May 2020 14:46:52 -0700 [thread overview] Message-ID: <20200507214652.GC3538@tassilo.jf.intel.com> (raw) In-Reply-To: <CAP-5=fUdoGJs+yViq3BOcJa7YyF53AD9RGQm8aRW72nMH0sKDA@mail.gmail.com> > > - without this change events within a metric may get scheduled > > together, after they may appear as part of a larger group and be > > multiplexed at different times, lowering accuracy - however, less > > multiplexing may compensate for this. > > I agree the heuristic in this patch set is naive and would welcome to > improve it from your toplev experience. I think this change is > progress on TopDownL1 - would you agree? TopdownL1 in non SMT mode should always fit. Inside a group deduping always makes sense. The problem is SMT mode where it doesn't fit. toplev tries to group each node and each level together. > > I'm wondering if what is needed are flags to control behavior. For > example, avoiding the use of groups altogether. For TopDownL1 I see. Yes the current situation isn't great. For Topdown your patch clearly is an improvement, I'm not sure it's for everything though. Probably the advanced heuristics are only useful for a few formulas, most are very simple. So maybe it's ok. I guess would need some testing over the existing formulas. -Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@linux.intel.com> To: Ian Rogers <irogers@google.com> Cc: 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>, Jiri Olsa <jolsa@redhat.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>, 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 Subject: Re: [RFC PATCH 0/7] Share events between metrics Date: Thu, 7 May 2020 14:46:52 -0700 [thread overview] Message-ID: <20200507214652.GC3538@tassilo.jf.intel.com> (raw) In-Reply-To: <CAP-5=fUdoGJs+yViq3BOcJa7YyF53AD9RGQm8aRW72nMH0sKDA@mail.gmail.com> > > - without this change events within a metric may get scheduled > > together, after they may appear as part of a larger group and be > > multiplexed at different times, lowering accuracy - however, less > > multiplexing may compensate for this. > > I agree the heuristic in this patch set is naive and would welcome to > improve it from your toplev experience. I think this change is > progress on TopDownL1 - would you agree? TopdownL1 in non SMT mode should always fit. Inside a group deduping always makes sense. The problem is SMT mode where it doesn't fit. toplev tries to group each node and each level together. > > I'm wondering if what is needed are flags to control behavior. For > example, avoiding the use of groups altogether. For TopDownL1 I see. Yes the current situation isn't great. For Topdown your patch clearly is an improvement, I'm not sure it's for everything though. Probably the advanced heuristics are only useful for a few formulas, most are very simple. So maybe it's ok. I guess would need some testing over the existing formulas. -Andi
next prev parent reply other threads:[~2020-05-07 21:47 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-07 8:14 [RFC PATCH 0/7] Share events between metrics Ian Rogers 2020-05-07 8:14 ` Ian Rogers 2020-05-07 8:14 ` [RFC PATCH 1/7] perf expr: migrate expr ids table to libbpf's hashmap Ian Rogers 2020-05-07 8:14 ` Ian Rogers 2020-05-07 8:14 ` [RFC PATCH 2/7] perf metricgroup: change evlist_used to a bitmap Ian Rogers 2020-05-07 8:14 ` Ian Rogers 2020-05-07 8:14 ` [RFC PATCH 3/7] perf metricgroup: free metric_events on error Ian Rogers 2020-05-07 8:14 ` Ian Rogers 2020-05-07 8:14 ` [RFC PATCH 4/7] perf metricgroup: always place duration_time last Ian Rogers 2020-05-07 8:14 ` Ian Rogers 2020-05-07 8:14 ` [RFC PATCH 5/7] perf metricgroup: delay events string creation Ian Rogers 2020-05-07 8:14 ` Ian Rogers 2020-05-07 8:14 ` [RFC PATCH 6/7] perf metricgroup: order event groups by size Ian Rogers 2020-05-07 8:14 ` Ian Rogers 2020-05-07 8:14 ` [RFC PATCH 7/7] perf metricgroup: remove duped metric group events Ian Rogers 2020-05-07 8:14 ` Ian Rogers 2020-05-07 13:49 ` [RFC PATCH 0/7] Share events between metrics Jiri Olsa 2020-05-07 13:49 ` Jiri Olsa 2020-05-07 14:11 ` Ian Rogers 2020-05-07 14:11 ` Ian Rogers 2020-05-07 17:48 ` Andi Kleen 2020-05-07 17:48 ` Andi Kleen 2020-05-07 18:15 ` Ian Rogers 2020-05-07 18:15 ` Ian Rogers 2020-05-07 21:46 ` Andi Kleen [this message] 2020-05-07 21:46 ` Andi Kleen 2020-05-08 5:43 ` Ian Rogers 2020-05-08 5:43 ` Ian Rogers 2020-12-15 15:08 ` Paul A. Clarke 2020-12-15 18:39 ` Andi Kleen
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