Re: [GIT PULL] perf changes for v3.8 [LWN.net]

From:		Linus Torvalds <torvalds-AT-linux-foundation.org>
To:		Ingo Molnar <mingo-AT-kernel.org>
Subject:		Re: [GIT PULL] perf changes for v3.8
Date:		Wed, 12 Dec 2012 18:53:36 -0800
Message-ID:		<CA+55aFw=sifEKVJwDvmfV317+RNrf9Z88xZ5pu0SwggrQrubTw@mail.gmail.com>
Cc:		Linux Kernel Mailing List <linux-kernel-AT-vger.kernel.org>, Arnaldo Carvalho de Melo <acme-AT-infradead.org>, Peter Zijlstra <a.p.zijlstra-AT-chello.nl>, Thomas Gleixner <tglx-AT-linutronix.de>, Andrew Morton <akpm-AT-linux-foundation.org>
Archive‑link:		Article

Hmm. This may be entirely unrelated to this particular pull request, but

   perf record -e cycles:pp

no longer works on my westmere machine (Operation not supported). It
used to work, but I haven't tried to bisect it, since I hope somebody
will just go "oh, I know what's up".

dmesg says:

  Performance Events: PEBS fmt1+, 16-deep LBR, Westmere events, Intel
PMU driver.
  perf_event_intel: CPUID marked event: 'bus cycles' unavailable
  ... version:                3
  ... bit width:              48
  ... generic registers:      4
  ... value mask:             0000ffffffffffff
  ... max period:             000000007fffffff
  ... fixed-purpose events:   3
  ... event mask:             000000070000000f

Any ideas?

              Linus