X-Received: by 10.152.37.101 with SMTP id x5mr2515764laj.5.1429984214781; Sat, 25 Apr 2015 10:50:14 -0700 (PDT) X-BeenThere: linux.kernel@googlegroups.com Received: by 10.152.88.110 with SMTP id bf14ls569994lab.48.gmail; Sat, 25 Apr 2015 10:50:03 -0700 (PDT) X-Received: by 10.112.171.41 with SMTP id ar9mr2522078lbc.24.1429984203041; Sat, 25 Apr 2015 10:50:03 -0700 (PDT) MIME-Version: 1.0 Path: ul5ni126894lbb.0!nntp.google.com!goblin2!goblin.stu.neva.ru!aioe.org!bofh.it!news.nic.it!robomod From: Mel Gorman Newsgroups: linux.kernel Subject: [PATCH 1/3] x86, mm: Trace when an IPI is about to be sent Date: Sat, 25 Apr 2015 19:50:02 +0200 Message-ID: References: X-Original-To: Linux-MM X-Mailer: git-send-email 2.3.5 Sender: rob...@news.nic.it List-ID: X-Mailing-List: linux-...@vger.kernel.org Approved: rob...@news.nic.it Lines: 59 Organization: linux.* mail to news gateway X-Original-Cc: Rik van Riel , Hugh Dickins , Minchan Kim , Dave Hansen , Andi Kleen , LKML , Mel Gorman X-Original-Date: Sat, 25 Apr 2015 18:45:40 +0100 X-Original-Message-ID: <1429983942-4308-2-gi...@suse.de> X-Original-References: <1429983942-4308-1-gi...@suse.de> X-Original-Sender: linux-ker...@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, -- 2.3.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majo...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/