From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030309AbbCSRMx (ORCPT ); Thu, 19 Mar 2015 13:12:53 -0400 Received: from mga02.intel.com ([134.134.136.20]:31255 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030292AbbCSRMr (ORCPT ); Thu, 19 Mar 2015 13:12:47 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,430,1422950400"; d="scan'208";a="701150159" From: "Kirill A. Shutemov" To: Andrew Morton , Andrea Arcangeli , Hugh Dickins Cc: Dave Hansen , Mel Gorman , Rik van Riel , Vlastimil Babka , Christoph Lameter , Naoya Horiguchi , Steve Capper , "Aneesh Kumar K.V" , Johannes Weiner , Michal Hocko , Jerome Marchand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" Subject: [PATCH 07/16] page-flags: define behavior SL*B-related flags on compound pages Date: Thu, 19 Mar 2015 19:08:13 +0200 Message-Id: <1426784902-125149-8-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1426784902-125149-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1426784902-125149-1-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 SL*B uses compound pages and marks head pages with PG_slab. __SetPageSlab() and __ClearPageSlab() are never called for tail pages. The same situation with PG_slob_free in SLOB allocator. NO_TAIL is appropriate for these flags. Signed-off-by: Kirill A. Shutemov --- include/linux/page-flags.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index bdb0d0e226c4..d41c63b566b8 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -279,7 +279,8 @@ PAGEFLAG(Dirty, dirty, HEAD) TESTSCFLAG(Dirty, dirty, HEAD) PAGEFLAG(LRU, lru, HEAD) __CLEARPAGEFLAG(LRU, lru, HEAD) PAGEFLAG(Active, active, HEAD) __CLEARPAGEFLAG(Active, active, HEAD) TESTCLEARFLAG(Active, active, HEAD) -__PAGEFLAG(Slab, slab, ANY) +__PAGEFLAG(Slab, slab, NO_TAIL) +__PAGEFLAG(SlobFree, slob_free, NO_TAIL) PAGEFLAG(Checked, checked, NO_COMPOUND) /* Used by some filesystems */ PAGEFLAG(Pinned, pinned, ANY) TESTSCFLAG(Pinned, pinned, ANY) /* Xen */ PAGEFLAG(SavePinned, savepinned, ANY); /* Xen */ @@ -289,8 +290,6 @@ PAGEFLAG(SwapBacked, swapbacked, ANY) __CLEARPAGEFLAG(SwapBacked, swapbacked, ANY) __SETPAGEFLAG(SwapBacked, swapbacked, ANY) -__PAGEFLAG(SlobFree, slob_free, ANY) - /* * Private page markings that may be used by the filesystem that owns the page * for its own purposes. -- 2.1.4