From patchwork Mon May 6 23:39:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 10932061 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 26B7216C1 for ; Mon, 6 May 2019 23:53:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1196F28567 for ; Mon, 6 May 2019 23:53:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 05D932888C; Mon, 6 May 2019 23:53:32 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 8F12D28567 for ; Mon, 6 May 2019 23:53:31 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 8318F212377FB; Mon, 6 May 2019 16:53:31 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=192.55.52.136; helo=mga12.intel.com; envelope-from=dan.j.williams@intel.com; receiver=linux-nvdimm@lists.01.org Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id BCDF421217957 for ; Mon, 6 May 2019 16:53:29 -0700 (PDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 May 2019 16:53:28 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,439,1549958400"; d="scan'208";a="147053295" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by fmsmga008.fm.intel.com with ESMTP; 06 May 2019 16:53:28 -0700 Subject: [PATCH v8 03/12] mm/sparsemem: Add helpers track active portions of a section at boot From: Dan Williams To: akpm@linux-foundation.org Date: Mon, 06 May 2019 16:39:42 -0700 Message-ID: <155718598213.130019.10989541248734713186.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <155718596657.130019.17139634728875079809.stgit@dwillia2-desk3.amr.corp.intel.com> References: <155718596657.130019.17139634728875079809.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-2-gc94f MIME-Version: 1.0 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mhocko@suse.com, Pavel Tatashin , linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Vlastimil Babka , osalvador@suse.de Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Prepare for hot{plug,remove} of sub-ranges of a section by tracking a sub-section active bitmask, each bit representing a PMD_SIZE span of the architecture's memory hotplug section size. The implications of a partially populated section is that pfn_valid() needs to go beyond a valid_section() check and read the sub-section active ranges from the bitmask. The expectation is that the bitmask (subsection_map) fits in the same cacheline as the valid_section() data, so the incremental performance overhead to pfn_valid() should be negligible. Cc: Michal Hocko Cc: Vlastimil Babka Cc: Logan Gunthorpe Cc: Oscar Salvador Cc: Pavel Tatashin Tested-by: Jane Chu Signed-off-by: Dan Williams Reviewed-by: Oscar Salvador --- include/linux/mmzone.h | 29 ++++++++++++++++++++++++++++- mm/page_alloc.c | 4 +++- mm/sparse.c | 29 +++++++++++++++++++++++++++++ 3 files changed, 60 insertions(+), 2 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index ac163f2f274f..6dd52d544857 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1199,6 +1199,8 @@ struct mem_section_usage { unsigned long pageblock_flags[0]; }; +void subsection_map_init(unsigned long pfn, unsigned long nr_pages); + struct page; struct page_ext; struct mem_section { @@ -1336,12 +1338,36 @@ static inline struct mem_section *__pfn_to_section(unsigned long pfn) extern int __highest_present_section_nr; +static inline int subsection_map_index(unsigned long pfn) +{ + return (pfn & ~(PAGE_SECTION_MASK)) / PAGES_PER_SUBSECTION; +} + +#ifdef CONFIG_SPARSEMEM_VMEMMAP +static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) +{ + int idx = subsection_map_index(pfn); + + return test_bit(idx, ms->usage->subsection_map); +} +#else +static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) +{ + return 1; +} +#endif + #ifndef CONFIG_HAVE_ARCH_PFN_VALID static inline int pfn_valid(unsigned long pfn) { + struct mem_section *ms; + if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) return 0; - return valid_section(__nr_to_section(pfn_to_section_nr(pfn))); + ms = __nr_to_section(pfn_to_section_nr(pfn)); + if (!valid_section(ms)) + return 0; + return pfn_section_valid(ms, pfn); } #endif @@ -1373,6 +1399,7 @@ void sparse_init(void); #define sparse_init() do {} while (0) #define sparse_index_init(_sec, _nid) do {} while (0) #define pfn_present pfn_valid +#define subsection_map_init(_pfn, _nr_pages) do {} while (0) #endif /* CONFIG_SPARSEMEM */ /* diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 61c2b54a5b61..13816c5a51eb 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -7291,10 +7291,12 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn) /* Print out the early node map */ pr_info("Early memory node ranges\n"); - for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) + for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) { pr_info(" node %3d: [mem %#018Lx-%#018Lx]\n", nid, (u64)start_pfn << PAGE_SHIFT, ((u64)end_pfn << PAGE_SHIFT) - 1); + subsection_map_init(start_pfn, end_pfn - start_pfn); + } /* Initialise every node */ mminit_verify_pageflags_layout(); diff --git a/mm/sparse.c b/mm/sparse.c index f87de7ad32c8..ac47a48050c7 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -210,6 +210,35 @@ static inline unsigned long first_present_section_nr(void) return next_present_section_nr(-1); } +void subsection_map_init(unsigned long pfn, unsigned long nr_pages) +{ + int end_sec = pfn_to_section_nr(pfn + nr_pages - 1); + int i, start_sec = pfn_to_section_nr(pfn); + + if (!nr_pages) + return; + + for (i = start_sec; i <= end_sec; i++) { + int idx, end; + unsigned long pfns; + struct mem_section *ms; + + idx = subsection_map_index(pfn); + pfns = min(nr_pages, PAGES_PER_SECTION + - (pfn & ~PAGE_SECTION_MASK)); + end = subsection_map_index(pfn + pfns - 1); + + ms = __nr_to_section(i); + bitmap_set(ms->usage->subsection_map, idx, end - idx + 1); + + pr_debug("%s: sec: %d pfns: %ld set(%d, %d)\n", __func__, i, + pfns, idx, end - idx + 1); + + pfn += pfns; + nr_pages -= pfns; + } +} + /* Record a memory area against a node. */ void __init memory_present(int nid, unsigned long start, unsigned long end) {