Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752736AbZKDANG (ORCPT ); Tue, 3 Nov 2009 19:13:06 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751564AbZKDANG (ORCPT ); Tue, 3 Nov 2009 19:13:06 -0500 Received: from mx1.redhat.com ([209.132.183.28]:49056 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752439AbZKDANF (ORCPT ); Tue, 3 Nov 2009 19:13:05 -0500 From: Masami Hiramatsu Subject: [PATCH -tip perf/probes 5/5] tracing/kprobes: Rename Kprobe-tracer to kprobe-event To: Ingo Molnar , Frederic Weisbecker , lkml Cc: systemtap , DLE , Masami Hiramatsu , Ingo Molnar , Steven Rostedt , Jim Keniston , Ananth N Mavinakayanahalli , Christoph Hellwig , "Frank Ch. Eigler" , Frederic Weisbecker , Jason Baron , "K.Prasad" , Peter Zijlstra , Srikar Dronamraju Date: Tue, 03 Nov 2009 19:12:47 -0500 Message-ID: <20091104001247.3454.14131.stgit@harusame> In-Reply-To: <20091104001204.3454.75999.stgit@harusame> References: <20091104001204.3454.75999.stgit@harusame> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6756 Lines: 181 Rename Kprobes-based event tracer to kprobes-based tracing event (kprobe-event), since it is not a tracer but an extensible tracing event interface. This also changes CONFIG_KPROBE_TRACER to CONFIG_KPROBE_EVENT and set y it by default. Signed-off-by: Masami Hiramatsu Cc: Ingo Molnar Cc: Steven Rostedt Cc: Jim Keniston Cc: Ananth N Mavinakayanahalli Cc: Christoph Hellwig Cc: Frank Ch. Eigler Cc: Frederic Weisbecker Cc: Jason Baron Cc: K.Prasad Cc: Peter Zijlstra Cc: Srikar Dronamraju --- Documentation/trace/kprobetrace.txt | 34 ++++++++++++++++------------------ kernel/trace/Kconfig | 19 ++++++++++++------- kernel/trace/Makefile | 2 +- kernel/trace/trace_kprobe.c | 6 ++---- 4 files changed, 31 insertions(+), 30 deletions(-) diff --git a/Documentation/trace/kprobetrace.txt b/Documentation/trace/kprobetrace.txt index 1541524..bd6a2e2 100644 --- a/Documentation/trace/kprobetrace.txt +++ b/Documentation/trace/kprobetrace.txt @@ -1,26 +1,23 @@ - Kprobe-based Event Tracer - ========================= + Kprobe-based Tracing Event + ========================== Documentation is written by Masami Hiramatsu Overview -------- -This tracer is similar to the events tracer which is based on Tracepoint -infrastructure. Instead of Tracepoint, this tracer is based on kprobes(kprobe -and kretprobe). It probes anywhere where kprobes can probe(this means, all -functions body except for __kprobes functions). +This event is similar to the tracepoint based event. Instead of Tracepoint, +this is based on kprobes (kprobe and kretprobe). So it can probe wherever +kprobes can probe (this means, all functions body except for __kprobes +functions). Unlike the Tracepoint based event, this can be added and removed +on the fly. -Unlike the function tracer, this tracer can probe instructions inside of -kernel functions. It allows you to check which instruction has been executed. +For enabling this feature, build your kernel with CONFIG_KPROBE_TRACING=y. -Unlike the Tracepoint based events tracer, this tracer can add and remove -probe points on the fly. - -Similar to the events tracer, this tracer doesn't need to be activated via -current_tracer, instead of that, just set probe points via -/sys/kernel/debug/tracing/kprobe_events. And you can set filters on each -probe events via /sys/kernel/debug/tracing/events/kprobes//filter. +Similar to the events tracer, this doesn't need to be activated via +current_tracer. Instead of that, add probe points via +/sys/kernel/debug/tracing/kprobe_events, and enable it via +/sys/kernel/debug/tracing/events/kprobes//enabled. Synopsis of kprobe_events @@ -55,9 +52,9 @@ Per-Probe Event Filtering ------------------------- Per-probe event filtering feature allows you to set different filter on each probe and gives you what arguments will be shown in trace buffer. If an event -name is specified right after 'p:' or 'r:' in kprobe_events, the tracer adds -an event under tracing/events/kprobes/, at the directory you can see -'id', 'enabled', 'format' and 'filter'. +name is specified right after 'p:' or 'r:' in kprobe_events, it adds an event +under tracing/events/kprobes/, at the directory you can see 'id', +'enabled', 'format' and 'filter'. enabled: You can enable/disable the probe by writing 1 or 0 on it. @@ -71,6 +68,7 @@ filter: id: This shows the id of this probe event. + Event Profiling --------------- You can check the total number of probe hits and probe miss-hits via diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 15372a9..d2ad714 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -428,17 +428,22 @@ config BLK_DEV_IO_TRACE If unsure, say N. -config KPROBE_TRACER +config KPROBE_EVENT depends on KPROBES depends on X86 - bool "Trace kprobes" + bool "Enable kprobes-based dynamic events" select TRACING - select GENERIC_TRACER + default y help - This tracer probes everywhere where kprobes can probe it, and - records various registers and memories specified by user. - This also allows you to trace kprobe probe points as a dynamic - defined events. It provides per-probe event filtering interface. + This allows user to add tracing events (like tracepoint) on the fly + via the ftrace interface. See Documentation/trace/kprobetrace.txt + for more details. + + Those events can probe wherever kprobes can probe, and record + various registers and memories. + + This option is required by perf-probe subcommand of perf tools. If + you want to use perf tools, this option is strongly recommended. config DYNAMIC_FTRACE bool "enable/disable ftrace tracepoints dynamically" diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index c8cb75d..edc3a3c 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -53,7 +53,7 @@ obj-$(CONFIG_EVENT_TRACING) += trace_export.o obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o obj-$(CONFIG_EVENT_PROFILE) += trace_event_profile.o obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o -obj-$(CONFIG_KPROBE_TRACER) += trace_kprobe.o +obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o obj-$(CONFIG_EVENT_TRACING) += power-traces.o libftrace-y := ftrace.o diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index a86c3ac..cf17a66 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -1,5 +1,5 @@ /* - * kprobe based kernel tracer + * Kprobes-based tracing events * * Created by Masami Hiramatsu * @@ -57,8 +57,6 @@ const char *reserved_field_names[] = { FIELD_STRING_FUNC, }; -/* currently, trace_kprobe only supports X86. */ - struct fetch_func { unsigned long (*func)(struct pt_regs *, void *); void *data; @@ -191,7 +189,7 @@ static __kprobes void free_indirect_fetch_data(struct indirect_fetch_data *data) } /** - * Kprobe tracer core functions + * Kprobe event core functions */ struct probe_arg { -- Masami Hiramatsu Software Engineer Hitachi Computer Products (America), Inc. Software Solutions Division e-mail: mhiramat@redhat.com -- 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/