From: Peter Zijlstra <peterz@infradead.org>
To: Ganapatrao Prabhakerrao Kulkarni <gkulkarni@marvell.com>
Cc: "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"mingo@redhat.com" <mingo@redhat.com>,
"will@kernel.org" <will@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"corbet@lwn.net" <corbet@lwn.net>,
"gklkml16@gmail.com" <gklkml16@gmail.com>
Subject: Re: [PATCH 1/2] perf/core: Adding capability to disable PMUs event multiplexing
Date: Wed, 6 Nov 2019 10:40:32 +0100 [thread overview]
Message-ID: <20191106094032.GV4131@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1573002091-9744-2-git-send-email-gkulkarni@marvell.com>
On Wed, Nov 06, 2019 at 01:01:40AM +0000, Ganapatrao Prabhakerrao Kulkarni wrote:
> When PMUs are registered, perf core enables event multiplexing
> support by default. There is no provision for PMUs to disable
> event multiplexing, if PMUs want to disable due to unavoidable
> circumstances like hardware errata etc.
>
> Adding PMU capability flag PERF_PMU_CAP_NO_MUX_EVENTS and support
> to allow PMUs to explicitly disable event multiplexing.
This doesn't make sense, multiplexing relies on nothing that normal
event scheduling doesn't also rely on.
Either you can schedule different sets of events, or you cannot.
NAK.
next prev parent reply other threads:[~2019-11-06 9:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-06 1:01 [PATCH 0/2] Workaround for ThunderX2 erratum 221 Ganapatrao Prabhakerrao Kulkarni
2019-11-06 1:01 ` [PATCH 1/2] perf/core: Adding capability to disable PMUs event multiplexing Ganapatrao Prabhakerrao Kulkarni
2019-11-06 9:40 ` Peter Zijlstra [this message]
2019-11-06 9:58 ` Peter Zijlstra
2019-11-06 11:28 ` Mark Rutland
2019-11-06 23:28 ` Ganapatrao Kulkarni
2019-11-07 14:35 ` Ganapatrao Kulkarni
2019-11-07 14:52 ` Mark Rutland
2019-11-07 15:45 ` Ganapatrao Kulkarni
2019-11-07 15:54 ` Mark Rutland
2019-11-07 15:04 ` Peter Zijlstra
2019-11-07 23:17 ` kbuild test robot
2019-11-06 1:01 ` [PATCH 2/2] Thunderx2, uncore: Add workaround for ThunderX2 erratum 221 Ganapatrao Prabhakerrao Kulkarni
2019-11-06 11:37 ` Mark Rutland
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