Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756741Ab3HZIqb (ORCPT ); Mon, 26 Aug 2013 04:46:31 -0400 Received: from e28smtp02.in.ibm.com ([122.248.162.2]:40017 "EHLO e28smtp02.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756624Ab3HZIq2 (ORCPT ); Mon, 26 Aug 2013 04:46:28 -0400 From: Wanpeng Li To: Andrew Morton Cc: Andi Kleen , Fengguang Wu , Naoya Horiguchi , Tony Luck , gong.chen@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wanpeng Li Subject: [PATCH v4 2/10] mm/hwpoison: don't need to hold compound lock for hugetlbfs page Date: Mon, 26 Aug 2013 16:46:06 +0800 Message-Id: <1377506774-5377-2-git-send-email-liwanp@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1377506774-5377-1-git-send-email-liwanp@linux.vnet.ibm.com> References: <1377506774-5377-1-git-send-email-liwanp@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13082608-5816-0000-0000-00000994B3DA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3674 Lines: 108 v1 -> v2: * drop compound_trans_order completely compound lock is introduced by commit e9da73d67("thp: compound_lock."), it is used to serialize put_page against __split_huge_page_refcount(). In addition, transparent hugepages will be splitted in hwpoison handler and just one subpage will be poisoned. There is unnecessary to hold compound lock for hugetlbfs page. This patch replace compound_trans_order by compond_order in the place where the page is hugetlbfs page. Reviewed-by: Naoya Horiguchi Signed-off-by: Wanpeng Li --- include/linux/mm.h | 14 -------------- mm/memory-failure.c | 12 ++++++------ 2 files changed, 6 insertions(+), 20 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index f022460..1745a2a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -489,20 +489,6 @@ static inline int compound_order(struct page *page) return (unsigned long)page[1].lru.prev; } -static inline int compound_trans_order(struct page *page) -{ - int order; - unsigned long flags; - - if (!PageHead(page)) - return 0; - - flags = compound_lock_irqsave(page); - order = compound_order(page); - compound_unlock_irqrestore(page, flags); - return order; -} - static inline void set_compound_order(struct page *page, unsigned long order) { page[1].lru.prev = (void *)order; diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 2c13aa7..efa6bd7 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -206,7 +206,7 @@ static int kill_proc(struct task_struct *t, unsigned long addr, int trapno, #ifdef __ARCH_SI_TRAPNO si.si_trapno = trapno; #endif - si.si_addr_lsb = compound_trans_order(compound_head(page)) + PAGE_SHIFT; + si.si_addr_lsb = compound_order(compound_head(page)) + PAGE_SHIFT; if ((flags & MF_ACTION_REQUIRED) && t == current) { si.si_code = BUS_MCEERR_AR; @@ -983,7 +983,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn, static void set_page_hwpoison_huge_page(struct page *hpage) { int i; - int nr_pages = 1 << compound_trans_order(hpage); + int nr_pages = 1 << compound_order(hpage); for (i = 0; i < nr_pages; i++) SetPageHWPoison(hpage + i); } @@ -991,7 +991,7 @@ static void set_page_hwpoison_huge_page(struct page *hpage) static void clear_page_hwpoison_huge_page(struct page *hpage) { int i; - int nr_pages = 1 << compound_trans_order(hpage); + int nr_pages = 1 << compound_order(hpage); for (i = 0; i < nr_pages; i++) ClearPageHWPoison(hpage + i); } @@ -1336,7 +1336,7 @@ int unpoison_memory(unsigned long pfn) return 0; } - nr_pages = 1 << compound_trans_order(page); + nr_pages = 1 << compound_order(page); if (!get_page_unless_zero(page)) { /* @@ -1491,7 +1491,7 @@ static int soft_offline_huge_page(struct page *page, int flags) } else { set_page_hwpoison_huge_page(hpage); dequeue_hwpoisoned_huge_page(hpage); - atomic_long_add(1 << compound_trans_order(hpage), + atomic_long_add(1 << compound_order(hpage), &num_poisoned_pages); } return ret; @@ -1551,7 +1551,7 @@ int soft_offline_page(struct page *page, int flags) if (PageHuge(page)) { set_page_hwpoison_huge_page(hpage); dequeue_hwpoisoned_huge_page(hpage); - atomic_long_add(1 << compound_trans_order(hpage), + atomic_long_add(1 << compound_order(hpage), &num_poisoned_pages); } else { SetPageHWPoison(page); -- 1.7.5.4 -- 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/