From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753711Ab1G0S6M (ORCPT ); Wed, 27 Jul 2011 14:58:12 -0400 Received: from smtp-out.google.com ([216.239.44.51]:53974 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751900Ab1G0S6K (ORCPT ); Wed, 27 Jul 2011 14:58:10 -0400 DomainKey-Signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=HgMmF88zyPMYd0isvGuCyzeSo16tssUvAeGDl9aJ/wuxjBFJLPvNzzrJuyvxBSr9G O4evMRKsK69RuGZenm1Bg== From: Vaibhav Nagarnaik To: Frederic Weisbecker , Thomas Gleixner , Ingo Molnar , Peter Zijlstra , Steven Rostedt Cc: Michael Rubin , David Sharp , linux-kernel@vger.kernel.org, x86@kernel.org, Vaibhav Nagarnaik Subject: [PATCH v2 4/6] trace: Add tracepoints to reschedule interrupt handler Date: Wed, 27 Jul 2011 11:57:16 -0700 Message-Id: <1311793038-15155-5-git-send-email-vnagarnaik@google.com> X-Mailer: git-send-email 1.7.3.1 In-Reply-To: <1310679495-29104-1-git-send-email-vnagarnaik@google.com> References: <1310679495-29104-1-git-send-email-vnagarnaik@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a part of overall effort to trace all the interrupts happening in a system. This shows how the interrupts are interacting with other events and what time is spent in kernel space versus user space. Signed-off-by: Vaibhav Nagarnaik --- include/trace/events/irq.h | 45 ++++++++++++++++++++++++++++++++++++++++++++ kernel/sched.c | 3 ++ 2 files changed, 48 insertions(+), 0 deletions(-) diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h index d8fab89..a2a0a49 100644 --- a/include/trace/events/irq.h +++ b/include/trace/events/irq.h @@ -339,6 +339,51 @@ DEFINE_EVENT(irq_work, irq_work_run_exit, TP_ARGS(ignore) ); +DECLARE_EVENT_CLASS(reschedule_interrupt, + + TP_PROTO(unsigned int ignore), + + TP_ARGS(ignore), + + TP_STRUCT__entry( + __field( unsigned int, ignore ) + ), + + TP_fast_assign( + __entry->ignore = ignore; + ), + + TP_printk("%u", __entry->ignore) +); + +/** + * reschedule_interrupt_entry - called immediately after entering the + * reschedule interrupt handler + * + * When used in combination with the reschedule_interrupt_exit tracepoint + * we can determine the reschedule interrupt handler runtime. + */ +DEFINE_EVENT(reschedule_interrupt, reschedule_interrupt_entry, + + TP_PROTO(unsigned int ignore), + + TP_ARGS(ignore) +); + +/** + * reschedule_interrupt_exit - called just before the reschedule interrupt + * handler returns + * + * When used in combination with the reschedule_interrupt_entry tracepoint + * we can determine the reschedule interrupt handler runtime. + */ +DEFINE_EVENT(reschedule_interrupt, reschedule_interrupt_exit, + + TP_PROTO(unsigned int ignore), + + TP_ARGS(ignore) +); + #endif /* _TRACE_IRQ_H */ /* This part must be outside protection */ diff --git a/kernel/sched.c b/kernel/sched.c index ccacdbd..f48b5aa 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -82,6 +82,7 @@ #include "sched_cpupri.h" #include "workqueue_sched.h" #include "sched_autogroup.h" +#include #define CREATE_TRACE_POINTS #include @@ -2578,6 +2579,7 @@ static void sched_ttwu_pending(void) struct rq *rq = this_rq(); struct task_struct *list = xchg(&rq->wake_list, NULL); + trace_reschedule_interrupt_entry(0); if (!list) return; @@ -2610,6 +2612,7 @@ void scheduler_ipi(void) irq_enter(); sched_ttwu_do_pending(list); irq_exit(); + trace_reschedule_interrupt_exit(0); } static void ttwu_queue_remote(struct task_struct *p, int cpu) -- 1.7.3.1