From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756078AbbGFNkG (ORCPT ); Mon, 6 Jul 2015 09:40:06 -0400 Received: from cantor2.suse.de ([195.135.220.15]:49195 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755944AbbGFNkD (ORCPT ); Mon, 6 Jul 2015 09:40:03 -0400 From: Mel Gorman To: Andrew Morton Cc: Rik van Riel , Dave Hansen , Ingo Molnar , Linus Torvalds , Linux-MM , LKML , Mel Gorman Subject: [PATCH 1/4] x86, mm: Trace when an IPI is about to be sent Date: Mon, 6 Jul 2015 14:39:53 +0100 Message-Id: <1436189996-7220-2-git-send-email-mgorman@suse.de> X-Mailer: git-send-email 2.3.5 In-Reply-To: <1436189996-7220-1-git-send-email-mgorman@suse.de> References: <1436189996-7220-1-git-send-email-mgorman@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It is easy to trace when an IPI is received to flush a TLB but harder to detect what event sent it. This patch makes it easy to identify the source of IPIs being transmitted for TLB flushes on x86. Signed-off-by: Mel Gorman Reviewed-by: Rik van Riel Reviewed-by: Dave Hansen --- arch/x86/mm/tlb.c | 1 + include/linux/mm_types.h | 1 + include/trace/events/tlb.h | 3 ++- 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 3250f2371aea..2da824c1c140 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -140,6 +140,7 @@ void native_flush_tlb_others(const struct cpumask *cpumask, info.flush_end = end; count_vm_tlb_event(NR_TLB_REMOTE_FLUSH); + trace_tlb_flush(TLB_REMOTE_SEND_IPI, end - start); if (is_uv_system()) { unsigned int cpu; diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 0038ac7466fd..84ef58543e2b 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -552,6 +552,7 @@ enum tlb_flush_reason { TLB_REMOTE_SHOOTDOWN, TLB_LOCAL_SHOOTDOWN, TLB_LOCAL_MM_SHOOTDOWN, + TLB_REMOTE_SEND_IPI, NR_TLB_FLUSH_REASONS, }; diff --git a/include/trace/events/tlb.h b/include/trace/events/tlb.h index 4250f364a6ca..bc8815f45f3b 100644 --- a/include/trace/events/tlb.h +++ b/include/trace/events/tlb.h @@ -11,7 +11,8 @@ EM( TLB_FLUSH_ON_TASK_SWITCH, "flush on task switch" ) \ EM( TLB_REMOTE_SHOOTDOWN, "remote shootdown" ) \ EM( TLB_LOCAL_SHOOTDOWN, "local shootdown" ) \ - EMe( TLB_LOCAL_MM_SHOOTDOWN, "local mm shootdown" ) + EM( TLB_LOCAL_MM_SHOOTDOWN, "local mm shootdown" ) \ + EMe( TLB_REMOTE_SEND_IPI, "remote ipi send" ) /* * First define the enums in TLB_FLUSH_REASON to be exported to userspace -- 2.3.5