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    Subject[RFC PATCH] Tracepoint sched probes
    ** note : early RFC. This patch applies on a unreleased LTTng for
    2.6.26-rc8 patchset.

    Scheduler tracepoint probes

    Only a single probe is implement as a POC.

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    CC: 'Peter Zijlstra' <peterz@infradead.org>
    CC: "Frank Ch. Eigler" <fche@redhat.com>
    CC: 'Ingo Molnar' <mingo@elte.hu>
    CC: 'Hideo AOKI' <haoki@redhat.com>
    CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
    CC: 'Steven Rostedt' <rostedt@goodmis.org>
    ---
    init/Kconfig | 7 +++++++
    kernel/Makefile | 1 +
    kernel/sched-trace.c | 28 ++++++++++++++++++++++++++++
    kernel/sched-trace.h | 11 +++++++++++
    kernel/sched.c | 5 +++--
    5 files changed, 50 insertions(+), 2 deletions(-)

    Index: linux-2.6.26-rc7-lttng/kernel/sched-trace.c
    ===================================================================
    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ linux-2.6.26-rc7-lttng/kernel/sched-trace.c 2008-06-25 18:36:11.000000000 -0400
    @@ -0,0 +1,28 @@
    +#include <linux/module.h>
    +#include "sched-trace.h"
    +
    +static void probe_sched_switch(void *private_data, struct task_struct *prev,
    + struct task_struct *next)
    +{
    + trace_mark(kernel_sched_schedule,
    + "prev_pid %d next_pid %d prev_state %ld",
    + prev->pid, next->pid, prev->state);
    +}
    +
    +int __init sched_trace_init(void)
    +{
    + return register_trace_sched_switch(probe_sched_switch, NULL);
    +}
    +
    +module_init(sched_trace_init);
    +
    +void __exit sched_trace_exit(void)
    +{
    + unregister_trace_sched_switch(probe_sched_switch, NULL);
    +}
    +
    +module_exit(sched_trace_exit);
    +
    +MODULE_LICENSE("GPL");
    +MODULE_AUTHOR("Mathieu Desnoyers");
    +MODULE_DESCRIPTION("Scheduler Tracpoint Probes");
    Index: linux-2.6.26-rc7-lttng/kernel/sched-trace.h
    ===================================================================
    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ linux-2.6.26-rc7-lttng/kernel/sched-trace.h 2008-06-25 18:36:11.000000000 -0400
    @@ -0,0 +1,11 @@
    +#ifndef _KERNEL_SCHED_TRACE_H
    +#define _KERNEL_SCHED_TRACE_H
    +
    +#include <linux/sched.h>
    +#include <linux/tracepoint.h>
    +
    +DEFINE_TRACE(sched_switch,
    + TPPROTO(struct task_struct *prev, struct task_struct *next),
    + TPARGS(prev, next));
    +
    +#endif
    Index: linux-2.6.26-rc7-lttng/kernel/sched.c
    ===================================================================
    --- linux-2.6.26-rc7-lttng.orig/kernel/sched.c 2008-06-25 18:35:42.000000000 -0400
    +++ linux-2.6.26-rc7-lttng/kernel/sched.c 2008-06-25 18:36:11.000000000 -0400
    @@ -75,6 +75,8 @@
    #include <asm/tlb.h>
    #include <asm/irq_regs.h>

    +#include "sched-trace.h"
    +
    /*
    * Convert user-nice values [ -20 ... 0 ... 19 ]
    * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
    @@ -2458,8 +2460,7 @@
    struct mm_struct *mm, *oldmm;

    prepare_task_switch(rq, prev, next);
    - trace_mark(internal_kernel_sched_schedule,
    - "prev %p next %p", prev, next);
    + trace_sched_switch(prev, next);
    mm = next->mm;
    oldmm = prev->active_mm;
    /*
    Index: linux-2.6.26-rc7-lttng/kernel/Makefile
    ===================================================================
    --- linux-2.6.26-rc7-lttng.orig/kernel/Makefile 2008-06-25 18:35:42.000000000 -0400
    +++ linux-2.6.26-rc7-lttng/kernel/Makefile 2008-06-25 18:36:11.000000000 -0400
    @@ -70,6 +70,7 @@
    obj-$(USE_IMMEDIATE) += immediate.o
    obj-$(CONFIG_MARKERS) += marker.o
    obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
    +obj-$(CONFIG_SCHED_TRACE) += sched-trace.o
    obj-$(CONFIG_LATENCYTOP) += latencytop.o

    ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
    Index: linux-2.6.26-rc7-lttng/init/Kconfig
    ===================================================================
    --- linux-2.6.26-rc7-lttng.orig/init/Kconfig 2008-06-25 18:36:07.000000000 -0400
    +++ linux-2.6.26-rc7-lttng/init/Kconfig 2008-06-25 18:36:26.000000000 -0400
    @@ -789,6 +789,13 @@
    Place an empty function call at each tracepoint site. Can be
    dynamically changed for a probe function.

    +config SCHED_TRACE
    + depends on TRACEPOINTS
    + tristate "Scheduler tracing"
    + default y
    + help
    + Build the scheduler tracing probes.
    +
    config MARKERS
    bool "Activate markers"
    help
    --
    Mathieu Desnoyers
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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