From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752637AbbDUKl1 (ORCPT ); Tue, 21 Apr 2015 06:41:27 -0400 Received: from cantor2.suse.de ([195.135.220.15]:34062 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751688AbbDUKlZ (ORCPT ); Tue, 21 Apr 2015 06:41:25 -0400 From: Mel Gorman To: Linux-MM Cc: Rik van Riel , Hugh Dickins , Minchan Kim , Dave Hansen , Andi Kleen , LKML , Mel Gorman Subject: [PATCH 1/6] x86, mm: Trace when an IPI is about to be sent Date: Tue, 21 Apr 2015 11:41:15 +0100 Message-Id: <1429612880-21415-2-git-send-email-mgorman@suse.de> X-Mailer: git-send-email 2.1.2 In-Reply-To: <1429612880-21415-1-git-send-email-mgorman@suse.de> References: <1429612880-21415-1-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 199a03aab8dc..856038aa166e 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -532,6 +532,7 @@ 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 0e7635765153..0fc101472988 100644 --- a/include/trace/events/tlb.h +++ b/include/trace/events/tlb.h @@ -11,7 +11,8 @@ { TLB_FLUSH_ON_TASK_SWITCH, "flush on task switch" }, \ { TLB_REMOTE_SHOOTDOWN, "remote shootdown" }, \ { TLB_LOCAL_SHOOTDOWN, "local shootdown" }, \ - { TLB_LOCAL_MM_SHOOTDOWN, "local mm shootdown" } + { TLB_LOCAL_MM_SHOOTDOWN, "local mm shootdown" }, \ + { TLB_REMOTE_SEND_IPI, "remote ipi send" } TRACE_EVENT_CONDITION(tlb_flush, -- 2.1.2