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, hch@lst.de Subject: [PATCH 13/13] libnvdimm, namespace: Publish page structure init state / control Date: Wed, 04 Jul 2018 23:50:13 -0700 [thread overview] Message-ID: <153077341292.40830.11333232703318633087.stgit@dwillia2-desk3.amr.corp.intel.com> (raw) In-Reply-To: <153077334130.40830.2714147692560185329.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 | 53 +++++++++++++++++++++++++++++++++++---------- mm/page_alloc.c | 1 + 2 files changed, 42 insertions(+), 12 deletions(-) diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index 147c62e2ef2b..00f1792d070c 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 +94,43 @@ 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 (strcmp(buf, "sync") == 0) + /* pass */; + else if (strcmp(buf, "sync\n") == 0) + /* pass */; + else + 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_init_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 +307,7 @@ 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 d1466dd82bc2..90414c1d2ca8 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5456,6 +5456,7 @@ void __ref build_all_zonelists(pg_data_t *pgdat) } ASYNC_DOMAIN_EXCLUSIVE(memmap_init_domain); +EXPORT_SYMBOL_GPL(memmap_init_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-nvdimm@lists.01.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 13/13] libnvdimm, namespace: Publish page structure init state / control Date: Wed, 04 Jul 2018 23:50:13 -0700 [thread overview] Message-ID: <153077341292.40830.11333232703318633087.stgit@dwillia2-desk3.amr.corp.intel.com> (raw) In-Reply-To: <153077334130.40830.2714147692560185329.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 | 53 +++++++++++++++++++++++++++++++++++---------- mm/page_alloc.c | 1 + 2 files changed, 42 insertions(+), 12 deletions(-) diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c index 147c62e2ef2b..00f1792d070c 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 +94,43 @@ 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 (strcmp(buf, "sync") == 0) + /* pass */; + else if (strcmp(buf, "sync\n") == 0) + /* pass */; + else + 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_init_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 +307,7 @@ 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 d1466dd82bc2..90414c1d2ca8 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5456,6 +5456,7 @@ void __ref build_all_zonelists(pg_data_t *pgdat) } ASYNC_DOMAIN_EXCLUSIVE(memmap_init_domain); +EXPORT_SYMBOL_GPL(memmap_init_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:[~2018-07-05 7:00 UTC|newest] Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-05 6:49 [PATCH 00/13] mm: Asynchronous + multithreaded memmap init for ZONE_DEVICE Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 01/13] mm: Plumb dev_pagemap instead of vmem_altmap to memmap_init_zone() Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 02/13] mm: Enable asynchronous __add_pages() and vmemmap_populate_hugepages() Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 03/13] mm: Teach memmap_init_zone() to initialize ZONE_DEVICE pages Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 04/13] mm: Multithread ZONE_DEVICE initialization Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 05/13] mm: Allow an external agent to wait for memmap initialization Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 06/13] nvdimm/pmem: check the validity of the pointer pfn Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 07/13] nvdimm/pmem-dax: " Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 08/13] s390/block/dcssblk: " Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 09/13] fs/dax: Assign NULL to pfn of dax_direct_access if useless Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:49 ` [PATCH 10/13] filesystem-dax: Make mount time pfn validation a debug check Dan Williams 2018-07-05 6:49 ` Dan Williams 2018-07-05 6:50 ` [PATCH 11/13] libnvdimm, pmem: Initialize the memmap in the background Dan Williams 2018-07-05 6:50 ` Dan Williams 2018-07-05 6:50 ` [PATCH 12/13] device-dax: " Dan Williams 2018-07-05 6:50 ` Dan Williams 2018-07-05 6:50 ` Dan Williams [this message] 2018-07-05 6:50 ` [PATCH 13/13] libnvdimm, namespace: Publish page structure init state / control Dan Williams 2018-07-05 8:29 ` Johannes Thumshirn 2018-07-05 8:29 ` Johannes Thumshirn 2018-07-05 8:29 ` Johannes Thumshirn 2018-07-05 14:46 ` Dan Williams 2018-07-05 14:46 ` Dan Williams 2018-07-05 14:49 ` Johannes Thumshirn 2018-07-05 14:49 ` Johannes Thumshirn 2018-07-05 14:49 ` Johannes Thumshirn 2018-07-05 20:24 ` Andrew Morton 2018-07-05 20:24 ` Andrew Morton 2018-07-05 20:34 ` Dan Williams 2018-07-05 20:34 ` Dan Williams 2018-07-06 8:18 ` Johannes Thumshirn 2018-07-06 8:18 ` Johannes Thumshirn 2018-07-06 8:18 ` Johannes Thumshirn 2018-07-05 21:00 ` Matthew Wilcox 2018-07-05 21:00 ` Matthew Wilcox 2018-07-05 19:49 ` Matthew Wilcox 2018-07-05 19:49 ` Matthew Wilcox 2018-07-05 19:52 ` Dan Williams 2018-07-05 19:52 ` Dan Williams 2018-07-05 20:00 ` Jeff Moyer 2018-07-09 12:56 ` [PATCH 00/13] mm: Asynchronous + multithreaded memmap init for ZONE_DEVICE Jan Kara 2018-07-09 12:56 ` Jan Kara 2018-07-09 16:53 ` Dan Williams
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