From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f47.google.com (mail-wg0-f47.google.com [74.125.82.47]) by kanga.kvack.org (Postfix) with ESMTP id 115CD900015 for ; Tue, 9 Jun 2015 13:39:21 -0400 (EDT) Received: by wgbgq6 with SMTP id gq6so18815804wgb.3 for ; Tue, 09 Jun 2015 10:39:20 -0700 (PDT) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id ea1si4476853wib.2.2015.06.09.10.32.05 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 09 Jun 2015 10:32:06 -0700 (PDT) From: Mel Gorman Subject: [PATCH 1/4] x86, mm: Trace when an IPI is about to be sent Date: Tue, 9 Jun 2015 18:31:55 +0100 Message-Id: <1433871118-15207-2-git-send-email-mgorman@suse.de> In-Reply-To: <1433871118-15207-1-git-send-email-mgorman@suse.de> References: <1433871118-15207-1-git-send-email-mgorman@suse.de> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Rik van Riel , Hugh Dickins , Minchan Kim , Dave Hansen , Andi Kleen , H Peter Anvin , Ingo Molnar , Linus Torvalds , Thomas Gleixner , Peter Zijlstra , Linux-MM , LKML , Mel Gorman 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 8d37e26a1007..86ad9f902042 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -534,6 +534,7 @@ 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org