From patchwork Fri Oct 13 17:32:04 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Tatashin X-Patchwork-Id: 10005421 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7E70960230 for ; Fri, 13 Oct 2017 17:34:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6801029103 for ; Fri, 13 Oct 2017 17:34:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5C32429105; Fri, 13 Oct 2017 17:34:08 +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=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B02D729103 for ; Fri, 13 Oct 2017 17:34:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Cc:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=p0yHouGAjew5cu45VpyamzrrSdviGDOxhCXLFqG2rFQ=; b=qqopUvOjQwZDWh 7cOjQm4u9M+Sg3D+Zy0pCwM6P8M/s3Src/t/oXpqZKYyOzSQ/hgIQDUxtqGU5aP2HYSSZc1SRaWVp DxyMcOxZGJ4waJGbKxTRKwrvUQ6vTDdworcAGPm/GoZu/XQjrAEc7vKkdZIuMUIYKRgqoY4awSlVR p+9v17OUfD2IFlfYxjQoQoXVyvr1rHAfnaQ61zxgqjFIVWaRYtVrll8tgb1X5g8tkSME8ddOcDAKU nipfotEIvBcf3Z15tDJmB1K9hkHEDbv5USkG+nU0KzTBqMhQEKIojRZvSCdLzNfllziA2h8X7Ov4S V4BQ0+zuYRA/eIhPtMWA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1e33qG-0008B9-5B; Fri, 13 Oct 2017 17:33:48 +0000 Received: from userp1040.oracle.com ([156.151.31.81]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1e33pq-0007Mn-8z for linux-arm-kernel@lists.infradead.org; Fri, 13 Oct 2017 17:33:25 +0000 Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v9DHWOs6020054 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 13 Oct 2017 17:32:25 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id v9DHWNvh005779 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 13 Oct 2017 17:32:23 GMT Received: from abhmp0017.oracle.com (abhmp0017.oracle.com [141.146.116.23]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id v9DHWLIj032048; Fri, 13 Oct 2017 17:32:21 GMT Received: from localhost.localdomain (/98.216.35.41) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 13 Oct 2017 10:32:21 -0700 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.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, kasan-dev@googlegroups.com, borntraeger@de.ibm.com, heiko.carstens@de.ibm.com, davem@davemloft.net, willy@infradead.org, mhocko@kernel.org, ard.biesheuvel@linaro.org, mark.rutland@arm.com, will.deacon@arm.com, catalin.marinas@arm.com, sam@ravnborg.org, mgorman@techsingularity.net, akpm@linux-foundation.org, steven.sistare@oracle.com, daniel.m.jordan@oracle.com, bob.picco@oracle.com Subject: [PATCH v12 01/11] mm: deferred_init_memmap improvements Date: Fri, 13 Oct 2017 13:32:04 -0400 Message-Id: <20171013173214.27300-2-pasha.tatashin@oracle.com> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171013173214.27300-1-pasha.tatashin@oracle.com> References: <20171013173214.27300-1-pasha.tatashin@oracle.com> X-Source-IP: aserv0021.oracle.com [141.146.126.233] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171013_103322_424630_7425ECAF X-CRM114-Status: GOOD ( 20.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP deferred_init_memmap() is called when struct pages are initialized later in boot by slave CPUs. This patch simplifies and optimizes this function, and also fixes a couple issues (described below). The main change is that now we are iterating through free memblock areas instead of all configured memory. Thus, we do not have to check if the struct page has already been initialized. Acked-by: Michal Hocko ===== In deferred_init_memmap() where all deferred struct pages are initialized we have a check like this: if (page->flags) { VM_BUG_ON(page_zone(page) != zone); goto free_range; } This way we are checking if the current deferred page has already been initialized. It works, because memory for struct pages has been zeroed, and the only way flags are not zero if it went through __init_single_page() before. But, once we change the current behavior and won't zero the memory in memblock allocator, we cannot trust anything inside "struct page"es until they are initialized. This patch fixes this. The deferred_init_memmap() is re-written to loop through only free memory ranges provided by memblock. Note, this first issue is relevant only when the following change is merged: ===== This patch fixes another existing issue on systems that have holes in zones i.e CONFIG_HOLES_IN_ZONE is defined. In for_each_mem_pfn_range() we have code like this: if (!pfn_valid_within(pfn) goto free_range; Note: 'page' is not set to NULL and is not incremented but 'pfn' advances. Thus means if deferred struct pages are enabled on systems with these kind of holes, linux would get memory corruptions. I have fixed this issue by defining a new macro that performs all the necessary operations when we free the current set of pages. Signed-off-by: Pavel Tatashin Reviewed-by: Steven Sistare Reviewed-by: Daniel Jordan Reviewed-by: Bob Picco --- mm/page_alloc.c | 168 ++++++++++++++++++++++++++++---------------------------- 1 file changed, 85 insertions(+), 83 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 77e4d3c5c57b..cdbd14829fd3 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1410,14 +1410,17 @@ void clear_zone_contiguous(struct zone *zone) } #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT -static void __init deferred_free_range(struct page *page, - unsigned long pfn, int nr_pages) +static void __init deferred_free_range(unsigned long pfn, + unsigned long nr_pages) { - int i; + struct page *page; + unsigned long i; - if (!page) + if (!nr_pages) return; + page = pfn_to_page(pfn); + /* Free a large naturally-aligned chunk if possible */ if (nr_pages == pageblock_nr_pages && (pfn & (pageblock_nr_pages - 1)) == 0) { @@ -1443,19 +1446,89 @@ static inline void __init pgdat_init_report_one_done(void) complete(&pgdat_init_all_done_comp); } +/* + * Helper for deferred_init_range, free the given range, reset the counters, and + * return number of pages freed. + */ +static inline unsigned long __def_free(unsigned long *nr_free, + unsigned long *free_base_pfn, + struct page **page) +{ + unsigned long nr = *nr_free; + + deferred_free_range(*free_base_pfn, nr); + *free_base_pfn = 0; + *nr_free = 0; + *page = NULL; + + return nr; +} + +static unsigned long deferred_init_range(int nid, int zid, unsigned long pfn, + unsigned long end_pfn) +{ + struct mminit_pfnnid_cache nid_init_state = { }; + unsigned long nr_pgmask = pageblock_nr_pages - 1; + unsigned long free_base_pfn = 0; + unsigned long nr_pages = 0; + unsigned long nr_free = 0; + struct page *page = NULL; + + for (; pfn < end_pfn; pfn++) { + /* + * First we check if pfn is valid on architectures where it is + * possible to have holes within pageblock_nr_pages. On systems + * where it is not possible, this function is optimized out. + * + * Then, we check if a current large page is valid by only + * checking the validity of the head pfn. + * + * meminit_pfn_in_nid is checked on systems where pfns can + * interleave within a node: a pfn is between start and end + * of a node, but does not belong to this memory node. + * + * Finally, we minimize pfn page lookups and scheduler checks by + * performing it only once every pageblock_nr_pages. + */ + if (!pfn_valid_within(pfn)) { + nr_pages += __def_free(&nr_free, &free_base_pfn, &page); + } else if (!(pfn & nr_pgmask) && !pfn_valid(pfn)) { + nr_pages += __def_free(&nr_free, &free_base_pfn, &page); + } else if (!meminit_pfn_in_nid(pfn, nid, &nid_init_state)) { + nr_pages += __def_free(&nr_free, &free_base_pfn, &page); + } else if (page && (pfn & nr_pgmask)) { + page++; + __init_single_page(page, pfn, zid, nid); + nr_free++; + } else { + nr_pages += __def_free(&nr_free, &free_base_pfn, &page); + page = pfn_to_page(pfn); + __init_single_page(page, pfn, zid, nid); + free_base_pfn = pfn; + nr_free = 1; + cond_resched(); + } + } + /* Free the last block of pages to allocator */ + nr_pages += __def_free(&nr_free, &free_base_pfn, &page); + + return nr_pages; +} + /* Initialise remaining memory on a node */ static int __init deferred_init_memmap(void *data) { pg_data_t *pgdat = data; int nid = pgdat->node_id; - struct mminit_pfnnid_cache nid_init_state = { }; unsigned long start = jiffies; unsigned long nr_pages = 0; - unsigned long walk_start, walk_end; - int i, zid; + unsigned long spfn, epfn; + phys_addr_t spa, epa; + int zid; struct zone *zone; unsigned long first_init_pfn = pgdat->first_deferred_pfn; const struct cpumask *cpumask = cpumask_of_node(pgdat->node_id); + u64 i; if (first_init_pfn == ULONG_MAX) { pgdat_init_report_one_done(); @@ -1477,83 +1550,12 @@ static int __init deferred_init_memmap(void *data) if (first_init_pfn < zone_end_pfn(zone)) break; } + first_init_pfn = max(zone->zone_start_pfn, first_init_pfn); - for_each_mem_pfn_range(i, nid, &walk_start, &walk_end, NULL) { - unsigned long pfn, end_pfn; - struct page *page = NULL; - struct page *free_base_page = NULL; - unsigned long free_base_pfn = 0; - int nr_to_free = 0; - - end_pfn = min(walk_end, zone_end_pfn(zone)); - pfn = first_init_pfn; - if (pfn < walk_start) - pfn = walk_start; - if (pfn < zone->zone_start_pfn) - pfn = zone->zone_start_pfn; - - for (; pfn < end_pfn; pfn++) { - if (!pfn_valid_within(pfn)) - goto free_range; - - /* - * Ensure pfn_valid is checked every - * pageblock_nr_pages for memory holes - */ - if ((pfn & (pageblock_nr_pages - 1)) == 0) { - if (!pfn_valid(pfn)) { - page = NULL; - goto free_range; - } - } - - if (!meminit_pfn_in_nid(pfn, nid, &nid_init_state)) { - page = NULL; - goto free_range; - } - - /* Minimise pfn page lookups and scheduler checks */ - if (page && (pfn & (pageblock_nr_pages - 1)) != 0) { - page++; - } else { - nr_pages += nr_to_free; - deferred_free_range(free_base_page, - free_base_pfn, nr_to_free); - free_base_page = NULL; - free_base_pfn = nr_to_free = 0; - - page = pfn_to_page(pfn); - cond_resched(); - } - - if (page->flags) { - VM_BUG_ON(page_zone(page) != zone); - goto free_range; - } - - __init_single_page(page, pfn, zid, nid); - if (!free_base_page) { - free_base_page = page; - free_base_pfn = pfn; - nr_to_free = 0; - } - nr_to_free++; - - /* Where possible, batch up pages for a single free */ - continue; -free_range: - /* Free the current block of pages to allocator */ - nr_pages += nr_to_free; - deferred_free_range(free_base_page, free_base_pfn, - nr_to_free); - free_base_page = NULL; - free_base_pfn = nr_to_free = 0; - } - /* Free the last block of pages to allocator */ - nr_pages += nr_to_free; - deferred_free_range(free_base_page, free_base_pfn, nr_to_free); - - first_init_pfn = max(end_pfn, first_init_pfn); + for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) { + spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa)); + epfn = min_t(unsigned long, zone_end_pfn(zone), PFN_DOWN(epa)); + nr_pages += deferred_init_range(nid, zid, spfn, epfn); } /* Sanity check that the next zone really is unpopulated */