From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f170.google.com (mail-ob0-f170.google.com [209.85.214.170]) by kanga.kvack.org (Postfix) with ESMTP id 737D0900015 for ; Thu, 19 Mar 2015 13:11:31 -0400 (EDT) Received: by obcjt1 with SMTP id jt1so39362177obc.2 for ; Thu, 19 Mar 2015 10:11:31 -0700 (PDT) Received: from mga03.intel.com (mga03.intel.com. [134.134.136.65]) by mx.google.com with ESMTP id e5si3801077pdf.253.2015.03.19.10.11.30 for ; Thu, 19 Mar 2015 10:11:30 -0700 (PDT) From: "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> 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: owner-linux-mm@kvack.org List-ID: 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" 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 -- 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