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Date: Thu, 1 Oct 2009 09:25:18 +0200 From: Ingo Molnar <mingo@...e.hu> To: Arjan van de Ven <arjan@...radead.org> Cc: prasad@...ux.vnet.ibm.com, "Frank Ch. Eigler" <fche@...hat.com>, peterz@...radead.org, linux-kernel@...r.kernel.org, Frederic Weisbecker <fweisbec@...il.com> Subject: Re: [RFC PATCH] perf_core: provide a kernel-internal interface to get to performance counters * Arjan van de Ven <arjan@...radead.org> wrote: > On Sun, 27 Sep 2009 00:02:46 +0530 > "K.Prasad" <prasad@...ux.vnet.ibm.com> wrote: > > > On Sat, Sep 26, 2009 at 12:03:28PM -0400, Frank Ch. Eigler wrote: > > > > For what it's worth, this sort of thing also looks useful from > > > systemtap's point of view. > > > > Wouldn't SystemTap be another user that desires support for > > multiple/all CPU perf-counters (apart from hw-breakpoints as a > > potential user)? As Arjan pointed out, perf's present design would > > support only a per-CPU or per-task counter; not both. > > I'm sorry but I think I am missing your point. "all cpu counters" > would be one small helper wrapper away, a helper I'm sure the > SystemTap people are happy to submit as part of their patch series > when they submit SystemTap to the kernel. Yes, and Frederic wrote that wrapper already for the hw-breakpoints patches. It's a non-issue and does not affect the design - we can always gang up an array of per cpu perf events, it's a straightforward use of the existing design. User-space tools have been doing this for ages already, 'perf top' will open an array of per cpu events to monitor all events in the system. Ingo -- 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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