From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com (userp1040.oracle.com [156.151.31.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3vq22R0JT8zDq7c for ; Fri, 24 Mar 2017 09:55:26 +1100 (AEDT) From: Pavel Tatashin To: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.or Subject: [v1 5/5] mm: teach platforms not to zero struct pages memory Date: Thu, 23 Mar 2017 19:01:53 -0400 Message-Id: <1490310113-824438-6-git-send-email-pasha.tatashin@oracle.com> In-Reply-To: <1490310113-824438-1-git-send-email-pasha.tatashin@oracle.com> References: <1490310113-824438-1-git-send-email-pasha.tatashin@oracle.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , If we are using deferred struct page initialization feature, most of "struct page"es are getting initialized after other CPUs are started, and hence we are benefiting from doing this job in parallel. However, we are still zeroing all the memory that is allocated for "struct pages" using the boot CPU. This patch solves this problem, by deferring zeroing "struct pages" to only when they are initialized. Signed-off-by: Pavel Tatashin Reviewed-by: Shannon Nelson --- arch/powerpc/mm/init_64.c | 2 +- arch/sparc/mm/init_64.c | 2 +- arch/x86/mm/init_64.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c index eb4c270..24faf2d 100644 --- a/arch/powerpc/mm/init_64.c +++ b/arch/powerpc/mm/init_64.c @@ -181,7 +181,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) if (vmemmap_populated(start, page_size)) continue; - p = vmemmap_alloc_block(page_size, node, true); + p = vmemmap_alloc_block(page_size, node, VMEMMAP_ZERO); if (!p) return -ENOMEM; diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index d91e462..280834e 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -2542,7 +2542,7 @@ int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend, pte = pmd_val(*pmd); if (!(pte & _PAGE_VALID)) { void *block = vmemmap_alloc_block(PMD_SIZE, node, - true); + VMEMMAP_ZERO); if (!block) return -ENOMEM; diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 46101b6..9d8c72c 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1177,7 +1177,7 @@ static int __meminit vmemmap_populate_hugepages(unsigned long start, void *p; p = __vmemmap_alloc_block_buf(PMD_SIZE, node, altmap, - true); + VMEMMAP_ZERO); if (p) { pte_t entry; -- 1.7.1