From: Dan Williams <dan.j.williams@intel.com> To: akpm@linux-foundation.org Cc: linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, jack@suse.cz, hch@lst.de Subject: [PATCH v2 14/14] libnvdimm, namespace: Publish page structure init state / control Date: Mon, 16 Jul 2018 10:01:35 -0700 [thread overview] Message-ID: <153176049568.12695.7468849534191505277.stgit@dwillia2-desk3.amr.corp.intel.com> (raw) In-Reply-To: <153176041838.12695.3365448145295112857.stgit@dwillia2-desk3.amr.corp.intel.com> Applications may want to know that page structure initialization is complete rather than be subject to delays at first DAX fault. Also, page structure initialization consumes CPU resources impacting application performance, so a environment may want to wait before considering the system fully initialized. Provide a sysfs attribute to display the current state, and when written with 'sync' complete memmap initialization. Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- drivers/nvdimm/pfn_devs.c | 49 ++++++++++++++++++++++++++++++++++----------- mm/page_alloc.c | 1 + 2 files changed, 38 insertions(+), 12 deletions(-) diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index 147c62e2ef2b..15ab96e2a9b5 100644 --- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -1,15 +1,6 @@ -/* - * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - */ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright(c) 2013-2018 Intel Corporation. All rights reserved. */ +#include <linux/memory_hotplug.h> #include <linux/memremap.h> #include <linux/blkdev.h> #include <linux/device.h> @@ -103,6 +94,39 @@ static ssize_t mode_store(struct device *dev, } static DEVICE_ATTR_RW(mode); +static ssize_t memmap_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); + struct memmap_async_state *async = &nd_pfn->async; + + return sprintf(buf, "%s\n", bitmap_weight(async->active, + NR_MEMMAP_THREADS) ? "active" : "idle"); +} + +static ssize_t memmap_state_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + int i; + struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); + struct memmap_async_state *async = &nd_pfn->async; + + if (!sysfs_streq(buf, "sync")) + return -EINVAL; + + for (i = 0; i < NR_MEMMAP_THREADS; i++) { + struct memmap_init_pages *thread = &async->page_init[i]; + + if (!test_bit(i, async->active)) + continue; + async_synchronize_cookie_domain(thread->cookie, + &memmap_pages_domain); + } + + return len; +} +static DEVICE_ATTR_RW(memmap_state); + static ssize_t align_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -279,6 +303,7 @@ static struct attribute *nd_pfn_attributes[] = { &dev_attr_resource.attr, &dev_attr_size.attr, &dev_attr_supported_alignments.attr, + &dev_attr_memmap_state.attr, NULL, }; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b9615a59d29d..2c87165594db 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5457,6 +5457,7 @@ void __ref build_all_zonelists(pg_data_t *pgdat) ASYNC_DOMAIN_EXCLUSIVE(memmap_init_domain); ASYNC_DOMAIN_EXCLUSIVE(memmap_pages_domain); +EXPORT_SYMBOL_GPL(memmap_pages_domain); static void __meminit memmap_init_one(unsigned long pfn, unsigned long zone, int nid, enum memmap_context context, struct dev_pagemap *pgmap) _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm
WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com> To: akpm@linux-foundation.org Cc: Ross Zwisler <ross.zwisler@linux.intel.com>, Vishal Verma <vishal.l.verma@intel.com>, Dave Jiang <dave.jiang@intel.com>, Johannes Thumshirn <jthumshirn@suse.de>, Jeff Moyer <jmoyer@redhat.com>, hch@lst.de, linux-mm@kvack.org, jack@suse.cz, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 14/14] libnvdimm, namespace: Publish page structure init state / control Date: Mon, 16 Jul 2018 10:01:35 -0700 [thread overview] Message-ID: <153176049568.12695.7468849534191505277.stgit@dwillia2-desk3.amr.corp.intel.com> (raw) In-Reply-To: <153176041838.12695.3365448145295112857.stgit@dwillia2-desk3.amr.corp.intel.com> Applications may want to know that page structure initialization is complete rather than be subject to delays at first DAX fault. Also, page structure initialization consumes CPU resources impacting application performance, so a environment may want to wait before considering the system fully initialized. Provide a sysfs attribute to display the current state, and when written with 'sync' complete memmap initialization. Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- drivers/nvdimm/pfn_devs.c | 49 ++++++++++++++++++++++++++++++++++----------- mm/page_alloc.c | 1 + 2 files changed, 38 insertions(+), 12 deletions(-) diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index 147c62e2ef2b..15ab96e2a9b5 100644 --- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -1,15 +1,6 @@ -/* - * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - */ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright(c) 2013-2018 Intel Corporation. All rights reserved. */ +#include <linux/memory_hotplug.h> #include <linux/memremap.h> #include <linux/blkdev.h> #include <linux/device.h> @@ -103,6 +94,39 @@ static ssize_t mode_store(struct device *dev, } static DEVICE_ATTR_RW(mode); +static ssize_t memmap_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); + struct memmap_async_state *async = &nd_pfn->async; + + return sprintf(buf, "%s\n", bitmap_weight(async->active, + NR_MEMMAP_THREADS) ? "active" : "idle"); +} + +static ssize_t memmap_state_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + int i; + struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev); + struct memmap_async_state *async = &nd_pfn->async; + + if (!sysfs_streq(buf, "sync")) + return -EINVAL; + + for (i = 0; i < NR_MEMMAP_THREADS; i++) { + struct memmap_init_pages *thread = &async->page_init[i]; + + if (!test_bit(i, async->active)) + continue; + async_synchronize_cookie_domain(thread->cookie, + &memmap_pages_domain); + } + + return len; +} +static DEVICE_ATTR_RW(memmap_state); + static ssize_t align_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -279,6 +303,7 @@ static struct attribute *nd_pfn_attributes[] = { &dev_attr_resource.attr, &dev_attr_size.attr, &dev_attr_supported_alignments.attr, + &dev_attr_memmap_state.attr, NULL, }; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b9615a59d29d..2c87165594db 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5457,6 +5457,7 @@ void __ref build_all_zonelists(pg_data_t *pgdat) ASYNC_DOMAIN_EXCLUSIVE(memmap_init_domain); ASYNC_DOMAIN_EXCLUSIVE(memmap_pages_domain); +EXPORT_SYMBOL_GPL(memmap_pages_domain); static void __meminit memmap_init_one(unsigned long pfn, unsigned long zone, int nid, enum memmap_context context, struct dev_pagemap *pgmap)
next prev parent reply other threads:[~2018-07-16 17:11 UTC|newest] Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-16 17:00 [PATCH v2 00/14] mm: Asynchronous + multithreaded memmap init for ZONE_DEVICE Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:00 ` [PATCH v2 01/14] mm: Plumb dev_pagemap instead of vmem_altmap to memmap_init_zone() Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:00 ` [PATCH v2 02/14] mm: Enable asynchronous __add_pages() and vmemmap_populate_hugepages() Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:00 ` [PATCH v2 03/14] mm: Teach memmap_init_zone() to initialize ZONE_DEVICE pages Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:00 ` [PATCH v2 04/14] mm: Multithread ZONE_DEVICE initialization Dan Williams 2018-07-16 17:00 ` [PATCH v2 05/14] mm, memremap: Up-level foreach_order_pgoff() Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 21:00 ` Matthew Wilcox 2018-07-16 21:00 ` Matthew Wilcox 2018-07-16 17:00 ` [PATCH v2 06/14] mm: Allow an external agent to coordinate memmap initialization Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:00 ` [PATCH v2 07/14] libnvdimm, pmem: Allow a NULL-pfn to ->direct_access() Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:00 ` Dan Williams 2018-07-16 17:01 ` [PATCH v2 08/14] tools/testing/nvdimm: " Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` [PATCH v2 09/14] s390, dcssblk: " Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` [PATCH v2 10/14] filesystem-dax: Do not request a pfn when not required Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` [PATCH v2 11/14] filesystem-dax: Make mount time pfn validation a debug check Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` [PATCH v2 12/14] libnvdimm, pmem: Initialize the memmap in the background Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` [PATCH v2 13/14] device-dax: " Dan Williams 2018-07-16 17:01 ` Dan Williams 2018-07-16 17:01 ` Dan Williams [this message] 2018-07-16 17:01 ` [PATCH v2 14/14] libnvdimm, namespace: Publish page structure init state / control Dan Williams 2018-07-16 19:12 ` [PATCH v2 00/14] mm: Asynchronous + multithreaded memmap init for ZONE_DEVICE Pavel Tatashin 2018-07-16 20:30 ` Dan Williams 2018-07-16 20:30 ` Dan Williams 2018-07-17 14:46 ` Pavel Tatashin 2018-07-17 14:46 ` Pavel Tatashin 2018-07-17 15:50 ` Michal Hocko 2018-07-17 15:50 ` Michal Hocko 2018-07-17 17:32 ` Dan Williams 2018-07-17 17:32 ` Dan Williams 2018-07-17 17:32 ` Dan Williams 2018-07-18 12:05 ` Michal Hocko 2018-07-18 12:05 ` Michal Hocko 2018-07-19 18:41 ` Dave Hansen 2018-07-19 18:41 ` Dave Hansen 2018-07-23 11:09 ` Michal Hocko 2018-07-23 16:15 ` Dave Hansen 2018-07-23 16:15 ` Dave Hansen 2018-07-24 7:29 ` Michal Hocko 2018-09-10 19:06 ` Dan Williams 2018-09-10 19:06 ` Dan Williams 2018-09-10 19:47 ` Alexander Duyck
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