Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754768AbZJ1P6e (ORCPT ); Wed, 28 Oct 2009 11:58:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754735AbZJ1P6d (ORCPT ); Wed, 28 Oct 2009 11:58:33 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:41650 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754725AbZJ1P6d (ORCPT ); Wed, 28 Oct 2009 11:58:33 -0400 Date: Wed, 28 Oct 2009 21:28:27 +0530 From: "K.Prasad" To: Ingo Molnar , Frederic Weisbecker Cc: LKML , Steven Rostedt , Alan Stern , Andrew Morton , Paul Mackerras Subject: [RFC Patch 0/4] Enhance perf-events to profile memory accesses using hw-breakpoints - ver II Message-ID: <20091028155827.GA8604@in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2298 Lines: 68 Hi All, Please find version II of the patchset that enables perf-events to place hw-breakpoints over kernel symbols (along with requisite enhancements to the hw-breakpoint layer). Changelog version II --------------------- Version I: http://lkml.org/lkml/2009/10/26/461 - Fixed parsing issues that disallowed other perf events to be invoked - Fixed user-space breakpoint usage which was broken due to patch 2/4 - Introduced an instance of perf_sample_data for use by do_perf_sw_event() An edited log of 'perf stat' and 'perf record' output is shown below for your reference. Kindly let me know your suggestions/feedback about the same. Thanks, K.Prasad Screen logs ------------ # perf stat -v -i -e breakpoint-readwrite:pid_max -e breakpoint-write:jiffies make kernel/futex.o CHK include/linux/version.h CHK include/linux/utsrelease.h SYMLINK include/asm -> include/asm-x86 CALL scripts/checksyscalls.sh CC kernel/futex.o breakpoint-readwrite: 68 298512531 298512531 breakpoint-write: 235 298512531 298512531 Performance counter stats for 'make kernel/futex.o': 68 breakpoint-readwrite # 0.000 M/sec 235 breakpoint-write # 0.000 M/sec 14.571235288 seconds time elapsed # # # perf record -v -i -e breakpoint-readwrite:jiffies top [Ran 'top' for about 10 seconds] # perf report -i perf.data # Samples: 2022950155 # # Overhead Command Shared Object Symbol # ........ ....... ............. ...... # 99.99% top [kernel] [k] scheduler_tick 0.01% perf [kernel] [k] scheduler_tick 0.00% top [kernel] [k] set_track 0.00% top [kernel] [k] run_timer_softirq 0.00% perf [kernel] [k] set_track 0.00% top [kernel] [k] __call_rcu 0.00% top [kernel] [k] calc_global_load 0.00% top [kernel] [k] do_timer 0.00% top [kernel] [k] __rcu_process_callbacks # # (For a higher level overview, try: perf report --sort comm,dso) # -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/