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[192.55.52.93]) by mx.google.com with ESMTPS id h2si21340726pfk.277.2019.04.17.11.53.02 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 17 Apr 2019 11:53:02 -0700 (PDT) Received-SPF: pass (google.com: domain of dan.j.williams@intel.com designates 192.55.52.93 as permitted sender) client-ip=192.55.52.93; Authentication-Results: mx.google.com; spf=pass (google.com: domain of dan.j.williams@intel.com designates 192.55.52.93 as permitted sender) smtp.mailfrom=dan.j.williams@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Apr 2019 11:53:02 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,362,1549958400"; d="scan'208";a="143759198" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by fmsmga007.fm.intel.com with ESMTP; 17 Apr 2019 11:53:01 -0700 Subject: [PATCH v6 04/12] mm/hotplug: Prepare shrink_{zone, pgdat}_span for sub-section removal 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 11:39:16 -0700 Message-ID: <155552635609.2015392.6246305135559796835.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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Sub-section hotplug support reduces the unit of operation of hotplug from section-sized-units (PAGES_PER_SECTION) to sub-section-sized units (PAGES_PER_SUBSECTION). Teach shrink_{zone,pgdat}_span() to consider PAGES_PER_SUBSECTION boundaries as the points where pfn_valid(), not valid_section(), can toggle. Cc: Michal Hocko Cc: Vlastimil Babka Cc: Logan Gunthorpe Signed-off-by: Dan Williams --- include/linux/mmzone.h | 2 ++ mm/memory_hotplug.c | 16 ++++++++-------- 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index cffde898e345..b13f0cddf75e 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1164,6 +1164,8 @@ static inline unsigned long section_nr_to_pfn(unsigned long sec) #define SECTION_ACTIVE_SIZE ((1UL << SECTION_SIZE_BITS) / BITS_PER_LONG) #define SECTION_ACTIVE_MASK (~(SECTION_ACTIVE_SIZE - 1)) +#define PAGES_PER_SUB_SECTION (SECTION_ACTIVE_SIZE / PAGE_SIZE) +#define PAGE_SUB_SECTION_MASK (~(PAGES_PER_SUB_SECTION-1)) struct mem_section_usage { /* diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 8b7415736d21..d5874f9d4043 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -327,10 +327,10 @@ static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, { struct mem_section *ms; - for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { + for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SUB_SECTION) { ms = __pfn_to_section(start_pfn); - if (unlikely(!valid_section(ms))) + if (unlikely(!pfn_valid(start_pfn))) continue; if (unlikely(pfn_to_nid(start_pfn) != nid)) @@ -355,10 +355,10 @@ static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, /* pfn is the end pfn of a memory section. */ pfn = end_pfn - 1; - for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { + for (; pfn >= start_pfn; pfn -= PAGES_PER_SUB_SECTION) { ms = __pfn_to_section(pfn); - if (unlikely(!valid_section(ms))) + if (unlikely(!pfn_valid(pfn))) continue; if (unlikely(pfn_to_nid(pfn) != nid)) @@ -417,10 +417,10 @@ static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, * it check the zone has only hole or not. */ pfn = zone_start_pfn; - for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { + for (; pfn < zone_end_pfn; pfn += PAGES_PER_SUB_SECTION) { ms = __pfn_to_section(pfn); - if (unlikely(!valid_section(ms))) + if (unlikely(!pfn_valid(pfn))) continue; if (page_zone(pfn_to_page(pfn)) != zone) @@ -485,10 +485,10 @@ static void shrink_pgdat_span(struct pglist_data *pgdat, * has only hole or not. */ pfn = pgdat_start_pfn; - for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { + for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SUB_SECTION) { ms = __pfn_to_section(pfn); - if (unlikely(!valid_section(ms))) + if (unlikely(!pfn_valid(pfn))) continue; if (pfn_to_nid(pfn) != nid)