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Message-ID: <87y4fl3mt4.fsf@ashishki-desk.ger.corp.intel.com> Date: Fri, 02 Oct 2015 07:40:39 +0300 From: Alexander Shishkin <alexander.shishkin@...ux.intel.com> To: Mathieu Poirier <mathieu.poirier@...aro.org> Cc: Greg KH <gregkh@...uxfoundation.org>, a.p.zijlstra@...llo.nl, Arnaldo Carvalho de Melo <acme@...nel.org>, Ingo Molnar <mingo@...hat.com>, Jon Corbet <corbet@....net>, Adrian Hunter <adrian.hunter@...el.com>, Chunyan Zhang <zhang.chunyan@...aro.org>, Mike Leach <mike.leach@....com>, Tor Jeremiassen <tor@...com>, Al Grant <al.grant@....com>, Paweł Moll <pawel.moll@....com>, "linux-arm-kernel\@lists.infradead.org" <linux-arm-kernel@...ts.infradead.org>, linux-doc@...r.kernel.org, "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [RFC PATCH 01/20] coresight: etm3x: splitting 'etm_enable_hw()' operations Mathieu Poirier <mathieu.poirier@...aro.org> writes: > On 30 September 2015 at 03:58, Alexander Shishkin > <alexander.shishkin@...ux.intel.com> wrote: >> Most of these things can also be bypassed, as at least initially perf >> events won't be using trigger/sequencer configurations, so we could >> simply clear all these things out when a first perf event is created >> (which would also disallow any sysfs poking around the etm/etb) and not >> worry about them in the pmu callbacks. > > I don't want to restrain configuration options to what is available > through Perf's cmd line. The sysFS interface is there to complement > what is currently not available. In practice this means that part of your trace configuration will be global and part -- per event, which can indeed work if you only have one event at a time, but again, makes using perf infrastructure redundant for this driver. For multiple events this doesn't make much sense. Regards, -- Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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