From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f69.google.com (mail-oi0-f69.google.com [209.85.218.69]) by kanga.kvack.org (Postfix) with ESMTP id 508C46B02F3 for ; Sun, 28 May 2017 13:01:40 -0400 (EDT) Received: by mail-oi0-f69.google.com with SMTP id h4so51771713oib.5 for ; Sun, 28 May 2017 10:01:40 -0700 (PDT) Received: from mail.kernel.org (mail.kernel.org. [198.145.29.99]) by mx.google.com with ESMTPS id t205si2880830oie.236.2017.05.28.10.01.38 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 28 May 2017 10:01:38 -0700 (PDT) From: Andy Lutomirski Subject: [PATCH v4 2/8] x86/mm: Change the leave_mm() condition for local TLB flushes Date: Sun, 28 May 2017 10:00:11 -0700 Message-Id: <61de238db6d9c9018db020c41047ce32dac64488.1495990440.git.luto@kernel.org> In-Reply-To: References: In-Reply-To: References: Sender: owner-linux-mm@kvack.org List-ID: To: X86 ML Cc: Borislav Petkov , Linus Torvalds , Andrew Morton , Mel Gorman , "linux-mm@kvack.org" , Nadav Amit , Rik van Riel , Andy Lutomirski , Dave Hansen , Nadav Amit , Michal Hocko , Arjan van de Ven On a remote TLB flush, we leave_mm() if we're TLBSTATE_LAZY. For a local flush_tlb_mm_range(), we leave_mm() if !current->mm. These are approximately the same condition -- the scheduler sets lazy TLB mode when switching to a thread with no mm. I'm about to merge the local and remote flush code, but for ease of verifying and bisecting the patch, I want the local and remote flush behavior to match first. This patch changes the local code to match the remote code. Cc: Rik van Riel Cc: Dave Hansen Cc: Nadav Amit Cc: Michal Hocko Cc: Arjan van de Ven Signed-off-by: Andy Lutomirski --- arch/x86/mm/tlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 776469cc54e0..3143c9a180e5 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -311,7 +311,7 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, goto out; } - if (!current->mm) { + if (this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK) { leave_mm(smp_processor_id()); /* Synchronize with switch_mm. */ -- 2.9.3 -- 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