Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161749Ab3DEMEc (ORCPT ); Fri, 5 Apr 2013 08:04:32 -0400 Received: from mga11.intel.com ([192.55.52.93]:64472 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161507Ab3DEL6Y (ORCPT ); Fri, 5 Apr 2013 07:58:24 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,414,1363158000"; d="scan'208";a="317363698" From: "Kirill A. Shutemov" To: Andrea Arcangeli , Andrew Morton Cc: Al Viro , Hugh Dickins , Wu Fengguang , Jan Kara , Mel Gorman , linux-mm@kvack.org, Andi Kleen , Matthew Wilcox , "Kirill A. Shutemov" , Hillf Danton , Dave Hansen , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv3, RFC 23/34] thp, mm: split huge page on mmap file page Date: Fri, 5 Apr 2013 14:59:47 +0300 Message-Id: <1365163198-29726-24-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1365163198-29726-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1365163198-29726-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1021 Lines: 34 From: "Kirill A. Shutemov" We are not ready to mmap file-backed tranparent huge pages. Let's split them on fault attempt. Later in the patchset we'll implement mmap() properly and this code path be used for fallback cases. Signed-off-by: Kirill A. Shutemov --- mm/filemap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index 3296f5c..6f0e3be 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1683,6 +1683,8 @@ retry_find: goto no_cached_page; } + if (PageTransCompound(page)) + split_huge_page(compound_trans_head(page)); if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags)) { page_cache_release(page); return ret | VM_FAULT_RETRY; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/