From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx158.postini.com [74.125.245.158]) by kanga.kvack.org (Postfix) with SMTP id 2E7986B0034 for ; Fri, 31 May 2013 06:56:12 -0400 (EDT) From: Vineet Gupta Subject: [PATCH 1/2] mm: Fix the TLB range flushed when __tlb_remove_page() runs out of slots Date: Fri, 31 May 2013 16:23:49 +0530 Message-ID: <1369997630-6522-2-git-send-email-vgupta@synopsys.com> In-Reply-To: <1369997630-6522-1-git-send-email-vgupta@synopsys.com> References: <1369997630-6522-1-git-send-email-vgupta@synopsys.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Max Filippov , Vineet Gupta , Mel Gorman , Hugh Dickins , Rik van Riel , David Rientjes , Peter Zijlstra , Catalin Marinas , Alex Shi zap_pte_range loops from @addr to @end. In the middle, if it runs out of batching slots, TLB entries needs to be flushed for @start to @interim, NOT @interim to @end. Since ARC port doesn't use page free batching I can't test it myself but this seems like the right thing to do. Observed this when working on a fix for the issue at thread: http://www.spinics.net/lists/linux-arch/msg21736.html Signed-off-by: Vineet Gupta Cc: Andrew Morton Cc: Mel Gorman Cc: Hugh Dickins Cc: Rik van Riel Cc: David Rientjes Cc: Peter Zijlstra Cc: linux-mm@kvack.org Cc: linux-arch@vger.kernel.org Cc: Catalin Marinas Cc: Max Filippov Cc: Alex Shi Acked-by: Catalin Marinas --- mm/memory.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 6dc1882..d9d5fd9 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1110,6 +1110,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, spinlock_t *ptl; pte_t *start_pte; pte_t *pte; + unsigned long range_start = addr; again: init_rss_vec(rss); @@ -1215,12 +1216,14 @@ again: force_flush = 0; #ifdef HAVE_GENERIC_MMU_GATHER - tlb->start = addr; - tlb->end = end; + tlb->start = range_start; + tlb->end = addr; #endif tlb_flush_mmu(tlb); - if (addr != end) + if (addr != end) { + range_start = addr; goto again; + } } return addr; -- 1.7.10.4 -- 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