From: Andi Kleen <ak@linux.intel.com>
To: Stephane Eranian <eranian@google.com>
Cc: "Liang, Kan" <kan.liang@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Ingo Molnar <mingo@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Jiri Olsa <jolsa@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Subject: Re: [RESEND PATCH V3 3/8] perf/x86/intel: Support hardware TopDown metrics
Date: Sat, 31 Aug 2019 10:53:37 -0700 [thread overview]
Message-ID: <20190831175337.GB5447@tassilo.jf.intel.com> (raw)
In-Reply-To: <CABPqkBSPfZ6iQ_t1ESZf334q+dNVf=RvoNHdmKZSs5GLokbjFQ@mail.gmail.com>
On Sat, Aug 31, 2019 at 02:13:05AM -0700, Stephane Eranian wrote:
> Andi,
>
> On Fri, Aug 30, 2019 at 5:31 PM Andi Kleen <ak@linux.intel.com> wrote:
> >
> > > the same manner. It would greatly simplify the kernel implementation.
> >
> > I tried that originally. It was actually more complicated.
> >
> > You can't really do deltas on raw metrics, and a lot of the perf
> > infrastructure is built around deltas.
> >
> How is RAPL handled? No deltas there either. It uses the snapshot model.
RAPL doesn't support any context switch or CPU context.
Also it has no concept of "accumulate with clear on read"
-Andi
next prev parent reply other threads:[~2019-08-31 17:57 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-26 14:47 [RESEND PATCH V3 0/8] TopDown metrics support for Icelake kan.liang
2019-08-26 14:47 ` [RESEND PATCH V3 1/8] perf/x86/intel: Set correct mask for TOPDOWN.SLOTS kan.liang
2019-08-28 7:48 ` Peter Zijlstra
2019-08-26 14:47 ` [RESEND PATCH V3 2/8] perf/x86/intel: Basic support for metrics counters kan.liang
2019-08-28 7:48 ` Peter Zijlstra
2019-08-28 7:52 ` Peter Zijlstra
2019-08-28 13:59 ` Liang, Kan
2019-08-28 8:44 ` Peter Zijlstra
2019-08-28 9:02 ` Peter Zijlstra
2019-08-28 9:37 ` Peter Zijlstra
2019-08-28 13:51 ` Liang, Kan
2019-08-28 8:52 ` Peter Zijlstra
2019-08-26 14:47 ` [RESEND PATCH V3 3/8] perf/x86/intel: Support hardware TopDown metrics kan.liang
2019-08-28 15:02 ` Peter Zijlstra
2019-08-28 19:04 ` Andi Kleen
2019-08-31 9:19 ` Peter Zijlstra
2019-09-09 13:40 ` Liang, Kan
2019-08-28 19:35 ` Liang, Kan
2019-08-28 15:19 ` Peter Zijlstra
2019-08-28 16:11 ` [PATCH] x86/math64: Provide a sane mul_u64_u32_div() implementation for x86_64 Peter Zijlstra
2019-08-29 9:30 ` Peter Zijlstra
2019-08-28 16:17 ` [RESEND PATCH V3 3/8] perf/x86/intel: Support hardware TopDown metrics Andi Kleen
2019-08-28 16:28 ` Peter Zijlstra
2019-08-29 3:11 ` Andi Kleen
2019-08-29 9:17 ` Peter Zijlstra
2019-08-29 13:31 ` Liang, Kan
2019-08-29 13:52 ` Peter Zijlstra
2019-08-29 16:56 ` Liang, Kan
2019-08-31 9:18 ` Peter Zijlstra
2019-08-30 23:18 ` Stephane Eranian
2019-08-31 0:31 ` Andi Kleen
2019-08-31 9:13 ` Stephane Eranian
2019-08-31 9:29 ` Peter Zijlstra
2019-08-31 17:53 ` Andi Kleen [this message]
2019-08-26 14:47 ` [RESEND PATCH V3 4/8] perf/x86/intel: Support per thread RDPMC " kan.liang
2019-08-26 14:47 ` [RESEND PATCH V3 5/8] perf/x86/intel: Export TopDown events for Icelake kan.liang
2019-08-26 14:47 ` [RESEND PATCH V3 6/8] perf/x86/intel: Disable sampling read slots and topdown kan.liang
2019-08-26 14:47 ` [RESEND PATCH V3 7/8] perf, tools, stat: Support new per thread TopDown metrics kan.liang
2019-08-26 14:47 ` [RESEND PATCH V3 8/8] perf, tools: Add documentation for topdown metrics kan.liang
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