From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
"ak@linux.intel.com" <ak@linux.intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Vince Weaver <vincent.weaver@maine.edu>,
Ingo Molnar <mingo@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC] perf: ref-cycle useless with watchdog changes
Date: Mon, 11 Jul 2016 12:33:28 +0200 [thread overview]
Message-ID: <20160711103328.GI30154@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CABPqkBSbNGLRgd1x2_D8t8tqSfDzxAzY-HnX3gAsfbGMwgCOEA@mail.gmail.com>
On Sun, Jul 10, 2016 at 11:48:11AM -0700, Stephane Eranian wrote:
> So we either redirect ref-cycles towards 0x013c
> (cpu_clk_unhalted:xlck) or another event maybe
Another solution is us introducing (another) fake event, say 0x0400,
which will have a constrained mask of: 0x0F | (6 << 32) and varies in
actual encoding depending on which counter it lands on.
That way we have more flexibility in scheduling the NMI watchdog, and
its exact period isn't _that_ important; although we could obviously
also fix up some of that if we wanted.
next prev parent reply other threads:[~2016-07-11 10:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-10 18:48 Stephane Eranian
2016-07-11 10:33 ` Peter Zijlstra [this message]
2016-07-12 8:24 ` Stephane Eranian
2016-07-12 12:02 ` Peter Zijlstra
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