From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2951 invoked by alias); 8 Mar 2012 01:49:06 -0000 Received: (qmail 2712 invoked by uid 22791); 8 Mar 2012 01:49:03 -0000 X-SWARE-Spam-Status: No, hits=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO sourceware.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 08 Mar 2012 01:48:51 +0000 From: "fche at redhat dot com" To: systemtap@sourceware.org Subject: [Bug translator/13820] timer.profile(NNN) variant using perf probes Date: Thu, 08 Mar 2012 01:49:00 -0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: systemtap X-Bugzilla-Component: translator X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: fche at redhat dot com X-Bugzilla-Status: NEW X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: systemtap at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org X-SW-Source: 2012-q1/txt/msg00259.txt.bz2 http://sourceware.org/bugzilla/show_bug.cgi?id=13820 --- Comment #1 from Frank Ch. Eigler 2012-03-08 01:48:28 UTC --- e.g. probe timer.profile.hz(997) { } could map on a 2000 MHz core to perf.hw.cpu_clock probe perf.type(0).config(0).sample(2006018) { } (where 2006018 would be 2,000,000,000 / 997). This would have to be calculated at module startup time. And it may be that we'd actually need a more complicated function, or even some sort of baby PLL, to approximate the desired frequency. It would probably be unwise to map timer.{hz,ms,etc.}(NNN) to this because this uses up scarce resources, so can't be unprivileged-safe. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug.