From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) (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 796DD2120B10C for ; Wed, 17 Apr 2019 11:52:57 -0700 (PDT) Subject: [PATCH v6 03/12] mm/sparsemem: Add helpers track active portions of a section at boot From: Dan Williams Date: Wed, 17 Apr 2019 11:39:11 -0700 Message-ID: <155552635098.2015392.5460028594173939000.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <155552633539.2015392.2477781120122237934.stgit@dwillia2-desk3.amr.corp.intel.com> References: <155552633539.2015392.2477781120122237934.stgit@dwillia2-desk3.amr.corp.intel.com> MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: akpm@linux-foundation.org Cc: mhocko@suse.com, linux-nvdimm@lists.01.org, david@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Vlastimil Babka List-ID: Prepare for hot{plug,remove} of sub-ranges of a section by tracking a section active bitmask, each bit representing 2MB (SECTION_SIZE (128M) / map_active bitmask length (64)). If it turns out that 2MB is too large of an active tracking granularity it is trivial to increase the size of the map_active bitmap. 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. Cc: Michal Hocko Cc: Vlastimil Babka Cc: Logan Gunthorpe Signed-off-by: Dan Williams --- include/linux/mmzone.h | 29 ++++++++++++++++++++++++++++- mm/page_alloc.c | 4 +++- mm/sparse.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 79 insertions(+), 2 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 6726fc175b51..cffde898e345 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1175,6 +1175,8 @@ struct mem_section_usage { unsigned long pageblock_flags[0]; }; +void section_active_init(unsigned long pfn, unsigned long nr_pages); + struct page; struct page_ext; struct mem_section { @@ -1312,12 +1314,36 @@ static inline struct mem_section *__pfn_to_section(unsigned long pfn) extern int __highest_present_section_nr; +static inline int section_active_index(phys_addr_t phys) +{ + return (phys & ~(PA_SECTION_MASK)) / SECTION_ACTIVE_SIZE; +} + +#ifdef CONFIG_SPARSEMEM_VMEMMAP +static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) +{ + int idx = section_active_index(PFN_PHYS(pfn)); + + return !!(ms->usage->map_active & (1UL << idx)); +} +#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 @@ -1349,6 +1375,7 @@ 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 section_active_init(_pfn, _nr_pages) do {} while (0) #endif /* CONFIG_SPARSEMEM */ /* diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f671401a7c0b..c9ad28a78018 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -7273,10 +7273,12 @@ 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); + section_active_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..5ef2f884c4e1 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -210,6 +210,54 @@ static inline unsigned long first_present_section_nr(void) return next_present_section_nr(-1); } +static unsigned long section_active_mask(unsigned long pfn, + unsigned long nr_pages) +{ + int idx_start, idx_size; + phys_addr_t start, size; + + if (!nr_pages) + return 0; + + start = PFN_PHYS(pfn); + size = PFN_PHYS(min(nr_pages, PAGES_PER_SECTION + - (pfn & ~PAGE_SECTION_MASK))); + size = ALIGN(size, SECTION_ACTIVE_SIZE); + + idx_start = section_active_index(start); + idx_size = section_active_index(size); + + if (idx_size == 0) + return -1; + return ((1UL << idx_size) - 1) << idx_start; +} + +void section_active_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++) { + struct mem_section *ms; + unsigned long mask; + unsigned long pfns; + + pfns = min(nr_pages, PAGES_PER_SECTION + - (pfn & ~PAGE_SECTION_MASK)); + mask = section_active_mask(pfn, pfns); + + ms = __nr_to_section(i); + pr_debug("%s: sec: %d mask: %#018lx\n", __func__, i, mask); + ms->usage->map_active = mask; + + pfn += pfns; + nr_pages -= pfns; + } +} + /* Record a memory area against a node. */ void __init memory_present(int nid, unsigned long start, unsigned long end) { _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm 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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 15F69C282DA for ; Wed, 17 Apr 2019 18:53:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6CBC20663 for ; Wed, 17 Apr 2019 18:53:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733005AbfDQSw7 (ORCPT ); Wed, 17 Apr 2019 14:52:59 -0400 Received: from mga01.intel.com ([192.55.52.88]:43965 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731358AbfDQSw5 (ORCPT ); Wed, 17 Apr 2019 14:52:57 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Apr 2019 11:52:56 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,362,1549958400"; d="scan'208";a="132232290" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by orsmga007.jf.intel.com with ESMTP; 17 Apr 2019 11:52:56 -0700 Subject: [PATCH v6 03/12] mm/sparsemem: Add helpers track active portions of a section at boot From: Dan Williams To: akpm@linux-foundation.org Cc: Michal Hocko , Vlastimil Babka , Logan Gunthorpe , linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, mhocko@suse.com, david@redhat.com Date: Wed, 17 Apr 2019 11:39:11 -0700 Message-ID: <155552635098.2015392.5460028594173939000.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <155552633539.2015392.2477781120122237934.stgit@dwillia2-desk3.amr.corp.intel.com> References: <155552633539.2015392.2477781120122237934.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-2-gc94f MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Prepare for hot{plug,remove} of sub-ranges of a section by tracking a section active bitmask, each bit representing 2MB (SECTION_SIZE (128M) / map_active bitmask length (64)). If it turns out that 2MB is too large of an active tracking granularity it is trivial to increase the size of the map_active bitmap. 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. Cc: Michal Hocko Cc: Vlastimil Babka Cc: Logan Gunthorpe Signed-off-by: Dan Williams --- include/linux/mmzone.h | 29 ++++++++++++++++++++++++++++- mm/page_alloc.c | 4 +++- mm/sparse.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 79 insertions(+), 2 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 6726fc175b51..cffde898e345 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1175,6 +1175,8 @@ struct mem_section_usage { unsigned long pageblock_flags[0]; }; +void section_active_init(unsigned long pfn, unsigned long nr_pages); + struct page; struct page_ext; struct mem_section { @@ -1312,12 +1314,36 @@ static inline struct mem_section *__pfn_to_section(unsigned long pfn) extern int __highest_present_section_nr; +static inline int section_active_index(phys_addr_t phys) +{ + return (phys & ~(PA_SECTION_MASK)) / SECTION_ACTIVE_SIZE; +} + +#ifdef CONFIG_SPARSEMEM_VMEMMAP +static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) +{ + int idx = section_active_index(PFN_PHYS(pfn)); + + return !!(ms->usage->map_active & (1UL << idx)); +} +#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 @@ -1349,6 +1375,7 @@ 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 section_active_init(_pfn, _nr_pages) do {} while (0) #endif /* CONFIG_SPARSEMEM */ /* diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f671401a7c0b..c9ad28a78018 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -7273,10 +7273,12 @@ 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); + section_active_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..5ef2f884c4e1 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -210,6 +210,54 @@ static inline unsigned long first_present_section_nr(void) return next_present_section_nr(-1); } +static unsigned long section_active_mask(unsigned long pfn, + unsigned long nr_pages) +{ + int idx_start, idx_size; + phys_addr_t start, size; + + if (!nr_pages) + return 0; + + start = PFN_PHYS(pfn); + size = PFN_PHYS(min(nr_pages, PAGES_PER_SECTION + - (pfn & ~PAGE_SECTION_MASK))); + size = ALIGN(size, SECTION_ACTIVE_SIZE); + + idx_start = section_active_index(start); + idx_size = section_active_index(size); + + if (idx_size == 0) + return -1; + return ((1UL << idx_size) - 1) << idx_start; +} + +void section_active_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++) { + struct mem_section *ms; + unsigned long mask; + unsigned long pfns; + + pfns = min(nr_pages, PAGES_PER_SECTION + - (pfn & ~PAGE_SECTION_MASK)); + mask = section_active_mask(pfn, pfns); + + ms = __nr_to_section(i); + pr_debug("%s: sec: %d mask: %#018lx\n", __func__, i, mask); + ms->usage->map_active = mask; + + pfn += pfns; + nr_pages -= pfns; + } +} + /* Record a memory area against a node. */ void __init memory_present(int nid, unsigned long start, unsigned long end) {