From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D12A0ECDFAA for ; Tue, 17 Jul 2018 00:56:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 76EF8208C3 for ; Tue, 17 Jul 2018 00:56:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 76EF8208C3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731369AbeGQBZz (ORCPT ); Mon, 16 Jul 2018 21:25:55 -0400 Received: from mga06.intel.com ([134.134.136.31]:31701 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729871AbeGQBZy (ORCPT ); Mon, 16 Jul 2018 21:25:54 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Jul 2018 17:55:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,363,1526367600"; d="scan'208";a="245788281" Received: from yhuang6-ux31a.sh.intel.com ([10.239.197.184]) by fmsmga005.fm.intel.com with ESMTP; 16 Jul 2018 17:55:49 -0700 From: "Huang, Ying" To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Michal Hocko , Johannes Weiner , Shaohua Li , Hugh Dickins , Minchan Kim , Rik van Riel , Daniel Jordan , Dan Williams , Dave Hansen Subject: [PATCH v2 2/7] mm/swapfile.c: Replace some #ifdef with IS_ENABLED() Date: Tue, 17 Jul 2018 08:55:51 +0800 Message-Id: <20180717005556.29758-3-ying.huang@intel.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20180717005556.29758-1-ying.huang@intel.com> References: <20180717005556.29758-1-ying.huang@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In mm/swapfile.c, THP (Transparent Huge Page) swap specific code is enclosed by #ifdef CONFIG_THP_SWAP/#endif to avoid code dilating when THP isn't enabled. But #ifdef/#endif in .c file hurt the code readability, so Dave suggested to use IS_ENABLED(CONFIG_THP_SWAP) instead and let compiler to do the dirty job for us. This has potential to remove some duplicated code too. From output of `size`, text data bss dec hex filename THP=y: 26269 2076 340 28685 700d mm/swapfile.o ifdef/endif: 24115 2028 340 26483 6773 mm/swapfile.o IS_ENABLED: 24179 2028 340 26547 67b3 mm/swapfile.o IS_ENABLED() based solution works quite well, almost as good as that of #ifdef/#endif. And from the diffstat, the removed lines are more than added lines. One #ifdef for split_swap_cluster() is kept. Because it is a public function with a stub implementation for CONFIG_THP_SWAP=n in swap.h. Signed-off-by: "Huang, Ying" Suggested-by: Dave Hansen Cc: Michal Hocko Cc: Johannes Weiner Cc: Shaohua Li Cc: Hugh Dickins Cc: Minchan Kim Cc: Rik van Riel Cc: Daniel Jordan Cc: Dan Williams --- mm/swapfile.c | 56 ++++++++++++++++---------------------------------------- 1 file changed, 16 insertions(+), 40 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 0a2a9643dd78..dd9263411f11 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -870,7 +870,6 @@ static int scan_swap_map_slots(struct swap_info_struct *si, return n_ret; } -#ifdef CONFIG_THP_SWAP static int swap_alloc_cluster(struct swap_info_struct *si, swp_entry_t *slot) { unsigned long idx; @@ -878,6 +877,11 @@ static int swap_alloc_cluster(struct swap_info_struct *si, swp_entry_t *slot) unsigned long offset, i; unsigned char *map; + if (!IS_ENABLED(CONFIG_THP_SWAP)) { + VM_WARN_ON_ONCE(1); + return 0; + } + if (cluster_list_empty(&si->free_clusters)) return 0; @@ -908,13 +912,6 @@ static void swap_free_cluster(struct swap_info_struct *si, unsigned long idx) unlock_cluster(ci); swap_range_free(si, offset, SWAPFILE_CLUSTER); } -#else -static int swap_alloc_cluster(struct swap_info_struct *si, swp_entry_t *slot) -{ - VM_WARN_ON_ONCE(1); - return 0; -} -#endif /* CONFIG_THP_SWAP */ static unsigned long scan_swap_map(struct swap_info_struct *si, unsigned char usage) @@ -1260,7 +1257,6 @@ static void swapcache_free(swp_entry_t entry) } } -#ifdef CONFIG_THP_SWAP static void swapcache_free_cluster(swp_entry_t entry) { unsigned long offset = swp_offset(entry); @@ -1271,6 +1267,9 @@ static void swapcache_free_cluster(swp_entry_t entry) unsigned int i, free_entries = 0; unsigned char val; + if (!IS_ENABLED(CONFIG_THP_SWAP)) + return; + si = _swap_info_get(entry); if (!si) return; @@ -1306,6 +1305,7 @@ static void swapcache_free_cluster(swp_entry_t entry) } } +#ifdef CONFIG_THP_SWAP int split_swap_cluster(swp_entry_t entry) { struct swap_info_struct *si; @@ -1320,11 +1320,7 @@ int split_swap_cluster(swp_entry_t entry) unlock_cluster(ci); return 0; } -#else -static inline void swapcache_free_cluster(swp_entry_t entry) -{ -} -#endif /* CONFIG_THP_SWAP */ +#endif void put_swap_page(struct page *page, swp_entry_t entry) { @@ -1483,7 +1479,6 @@ int swp_swapcount(swp_entry_t entry) return count; } -#ifdef CONFIG_THP_SWAP static bool swap_page_trans_huge_swapped(struct swap_info_struct *si, swp_entry_t entry) { @@ -1494,6 +1489,9 @@ static bool swap_page_trans_huge_swapped(struct swap_info_struct *si, int i; bool ret = false; + if (!IS_ENABLED(CONFIG_THP_SWAP)) + return swap_swapcount(si, entry) != 0; + ci = lock_cluster_or_swap_info(si, offset); if (!ci || !cluster_is_huge(ci)) { if (map[roffset] != SWAP_HAS_CACHE) @@ -1516,7 +1514,7 @@ static bool page_swapped(struct page *page) swp_entry_t entry; struct swap_info_struct *si; - if (likely(!PageTransCompound(page))) + if (!IS_ENABLED(CONFIG_THP_SWAP) || likely(!PageTransCompound(page))) return page_swapcount(page) != 0; page = compound_head(page); @@ -1540,10 +1538,8 @@ static int page_trans_huge_map_swapcount(struct page *page, int *total_mapcount, /* hugetlbfs shouldn't call it */ VM_BUG_ON_PAGE(PageHuge(page), page); - if (likely(!PageTransCompound(page))) { - mapcount = atomic_read(&page->_mapcount) + 1; - if (total_mapcount) - *total_mapcount = mapcount; + if (!IS_ENABLED(CONFIG_THP_SWAP) || likely(!PageTransCompound(page))) { + mapcount = page_trans_huge_mapcount(page, total_mapcount); if (PageSwapCache(page)) swapcount = page_swapcount(page); if (total_swapcount) @@ -1590,26 +1586,6 @@ static int page_trans_huge_map_swapcount(struct page *page, int *total_mapcount, return map_swapcount; } -#else -#define swap_page_trans_huge_swapped(si, entry) swap_swapcount(si, entry) -#define page_swapped(page) (page_swapcount(page) != 0) - -static int page_trans_huge_map_swapcount(struct page *page, int *total_mapcount, - int *total_swapcount) -{ - int mapcount, swapcount = 0; - - /* hugetlbfs shouldn't call it */ - VM_BUG_ON_PAGE(PageHuge(page), page); - - mapcount = page_trans_huge_mapcount(page, total_mapcount); - if (PageSwapCache(page)) - swapcount = page_swapcount(page); - if (total_swapcount) - *total_swapcount = swapcount; - return mapcount + swapcount; -} -#endif /* * We can write to an anon page without COW if there are no other references -- 2.16.4