| Message ID | 20190507183804.5512-7-david@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/8] mm/memory_hotplug: Simplify and fix check_hotplug_memory_range() | expand |
On Tue, May 7, 2019 at 11:39 AM David Hildenbrand <david@redhat.com> wrote: > > Let's factor out removing of memory block devices, which is only > necessary for memory added via add_memory() and friends that created > memory block devices. Remove the devices before calling > arch_remove_memory(). > > This finishes factoring out memory block device handling from > arch_add_memory() and arch_remove_memory(). Also nice! makes it easier in the future for the "device-memory" use case to not avoid messing up the typical memory hotplug flow. > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Cc: "Rafael J. Wysocki" <rafael@kernel.org> > Cc: David Hildenbrand <david@redhat.com> > Cc: "mike.travis@hpe.com" <mike.travis@hpe.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Andrew Banman <andrew.banman@hpe.com> > Cc: Ingo Molnar <mingo@kernel.org> > Cc: Alex Deucher <alexander.deucher@amd.com> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Mark Brown <broonie@kernel.org> > Cc: Chris Wilson <chris@chris-wilson.co.uk> > Cc: Oscar Salvador <osalvador@suse.de> > Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> > Cc: Michal Hocko <mhocko@suse.com> > Cc: Pavel Tatashin <pavel.tatashin@microsoft.com> > Cc: Arun KS <arunks@codeaurora.org> > Cc: Mathieu Malaterre <malat@debian.org> > Signed-off-by: David Hildenbrand <david@redhat.com> > --- > drivers/base/memory.c | 39 +++++++++++++++++++-------------------- > drivers/base/node.c | 11 ++++++----- > include/linux/memory.h | 2 +- > include/linux/node.h | 6 ++---- > mm/memory_hotplug.c | 5 +++-- > 5 files changed, 31 insertions(+), 32 deletions(-) > > diff --git a/drivers/base/memory.c b/drivers/base/memory.c > index 862c202a18ca..47ff49058d1f 100644 > --- a/drivers/base/memory.c > +++ b/drivers/base/memory.c > @@ -756,32 +756,31 @@ int hotplug_memory_register(unsigned long start, unsigned long size) > return ret; > } > > -static int remove_memory_section(struct mem_section *section) > +/* > + * Remove memory block devices for the given memory area. Start and size > + * have to be aligned to memory block granularity. Memory block devices > + * have to be offline. > + */ > +void hotplug_memory_unregister(unsigned long start, unsigned long size) > { > + unsigned long block_nr_pages = memory_block_size_bytes() >> PAGE_SHIFT; > + unsigned long start_pfn = PFN_DOWN(start); > + unsigned long end_pfn = start_pfn + (size >> PAGE_SHIFT); > struct memory_block *mem; > + unsigned long pfn; > > - if (WARN_ON_ONCE(!present_section(section))) > - return; > + BUG_ON(!IS_ALIGNED(start, memory_block_size_bytes())); > + BUG_ON(!IS_ALIGNED(size, memory_block_size_bytes())); Similar BUG_ON vs comments WARN_ON comments as the previous patch. > > mutex_lock(&mem_sysfs_mutex); > - > - /* > - * Some users of the memory hotplug do not want/need memblock to > - * track all sections. Skip over those. > - */ > - mem = find_memory_block(section); > - if (!mem) > - goto out_unlock; > - > - unregister_mem_sect_under_nodes(mem, __section_nr(section)); > - > - mem->section_count--; > - if (mem->section_count == 0) > + for (pfn = start_pfn; pfn != end_pfn; pfn += block_nr_pages) { > + mem = find_memory_block(__pfn_to_section(pfn)); > + if (!mem) > + continue; > + mem->section_count = 0; > + unregister_memory_block_under_nodes(mem); > unregister_memory(mem); > - else > - put_device(&mem->dev); > - > -out_unlock: > + } > mutex_unlock(&mem_sysfs_mutex); > } > > diff --git a/drivers/base/node.c b/drivers/base/node.c > index 8598fcbd2a17..04fdfa99b8bc 100644 > --- a/drivers/base/node.c > +++ b/drivers/base/node.c > @@ -801,9 +801,10 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, void *arg) > return 0; > } > > -/* unregister memory section under all nodes that it spans */ > -int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, > - unsigned long phys_index) > +/* > + * Unregister memory block device under all nodes that it spans. > + */ > +int unregister_memory_block_under_nodes(struct memory_block *mem_blk) > { > NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); > unsigned long pfn, sect_start_pfn, sect_end_pfn; > @@ -816,8 +817,8 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, > return -ENOMEM; > nodes_clear(*unlinked_nodes); > > - sect_start_pfn = section_nr_to_pfn(phys_index); > - sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; > + sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); > + sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); > for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { > int nid; > > diff --git a/include/linux/memory.h b/include/linux/memory.h > index 95505fbb5f85..aa236c2a0466 100644 > --- a/include/linux/memory.h > +++ b/include/linux/memory.h > @@ -112,7 +112,7 @@ extern void unregister_memory_notifier(struct notifier_block *nb); > extern int register_memory_isolate_notifier(struct notifier_block *nb); > extern void unregister_memory_isolate_notifier(struct notifier_block *nb); > int hotplug_memory_register(unsigned long start, unsigned long size); > -extern void unregister_memory_section(struct mem_section *); > +void hotplug_memory_unregister(unsigned long start, unsigned long size); > extern int memory_dev_init(void); > extern int memory_notify(unsigned long val, void *v); > extern int memory_isolate_notify(unsigned long val, void *v); > diff --git a/include/linux/node.h b/include/linux/node.h > index 1a557c589ecb..02a29e71b175 100644 > --- a/include/linux/node.h > +++ b/include/linux/node.h > @@ -139,8 +139,7 @@ extern int register_cpu_under_node(unsigned int cpu, unsigned int nid); > extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid); > extern int register_mem_sect_under_node(struct memory_block *mem_blk, > void *arg); > -extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, > - unsigned long phys_index); > +extern int unregister_memory_block_under_nodes(struct memory_block *mem_blk); > > extern int register_memory_node_under_compute_node(unsigned int mem_nid, > unsigned int cpu_nid, > @@ -176,8 +175,7 @@ static inline int register_mem_sect_under_node(struct memory_block *mem_blk, > { > return 0; > } > -static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, > - unsigned long phys_index) > +static inline int unregister_memory_block_under_nodes(struct memory_block *mem_blk) > { > return 0; > } > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index 107f72952347..527fe4f9c620 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -519,8 +519,6 @@ static void __remove_section(struct zone *zone, struct mem_section *ms, > if (WARN_ON_ONCE(!valid_section(ms))) > return; > > - unregister_memory_section(ms); > - > scn_nr = __section_nr(ms); > start_pfn = section_nr_to_pfn((unsigned long)scn_nr); > __remove_zone(zone, start_pfn); > @@ -1844,6 +1842,9 @@ void __ref __remove_memory(int nid, u64 start, u64 size) > memblock_free(start, size); > memblock_remove(start, size); > > + /* remove memory block devices before removing memory */ > + hotplug_memory_unregister(start, size); > + > arch_remove_memory(nid, start, size, NULL); > __release_memory_resource(start, size); Other than the BUG_ON concern you can add Reviewed-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 862c202a18ca..47ff49058d1f 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -756,32 +756,31 @@ int hotplug_memory_register(unsigned long start, unsigned long size) return ret; } -static int remove_memory_section(struct mem_section *section) +/* + * Remove memory block devices for the given memory area. Start and size + * have to be aligned to memory block granularity. Memory block devices + * have to be offline. + */ +void hotplug_memory_unregister(unsigned long start, unsigned long size) { + unsigned long block_nr_pages = memory_block_size_bytes() >> PAGE_SHIFT; + unsigned long start_pfn = PFN_DOWN(start); + unsigned long end_pfn = start_pfn + (size >> PAGE_SHIFT); struct memory_block *mem; + unsigned long pfn; - if (WARN_ON_ONCE(!present_section(section))) - return; + BUG_ON(!IS_ALIGNED(start, memory_block_size_bytes())); + BUG_ON(!IS_ALIGNED(size, memory_block_size_bytes())); mutex_lock(&mem_sysfs_mutex); - - /* - * Some users of the memory hotplug do not want/need memblock to - * track all sections. Skip over those. - */ - mem = find_memory_block(section); - if (!mem) - goto out_unlock; - - unregister_mem_sect_under_nodes(mem, __section_nr(section)); - - mem->section_count--; - if (mem->section_count == 0) + for (pfn = start_pfn; pfn != end_pfn; pfn += block_nr_pages) { + mem = find_memory_block(__pfn_to_section(pfn)); + if (!mem) + continue; + mem->section_count = 0; + unregister_memory_block_under_nodes(mem); unregister_memory(mem); - else - put_device(&mem->dev); - -out_unlock: + } mutex_unlock(&mem_sysfs_mutex); } diff --git a/drivers/base/node.c b/drivers/base/node.c index 8598fcbd2a17..04fdfa99b8bc 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -801,9 +801,10 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, void *arg) return 0; } -/* unregister memory section under all nodes that it spans */ -int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, - unsigned long phys_index) +/* + * Unregister memory block device under all nodes that it spans. + */ +int unregister_memory_block_under_nodes(struct memory_block *mem_blk) { NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); unsigned long pfn, sect_start_pfn, sect_end_pfn; @@ -816,8 +817,8 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, return -ENOMEM; nodes_clear(*unlinked_nodes); - sect_start_pfn = section_nr_to_pfn(phys_index); - sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; + sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); + sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { int nid; diff --git a/include/linux/memory.h b/include/linux/memory.h index 95505fbb5f85..aa236c2a0466 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -112,7 +112,7 @@ extern void unregister_memory_notifier(struct notifier_block *nb); extern int register_memory_isolate_notifier(struct notifier_block *nb); extern void unregister_memory_isolate_notifier(struct notifier_block *nb); int hotplug_memory_register(unsigned long start, unsigned long size); -extern void unregister_memory_section(struct mem_section *); +void hotplug_memory_unregister(unsigned long start, unsigned long size); extern int memory_dev_init(void); extern int memory_notify(unsigned long val, void *v); extern int memory_isolate_notify(unsigned long val, void *v); diff --git a/include/linux/node.h b/include/linux/node.h index 1a557c589ecb..02a29e71b175 100644 --- a/include/linux/node.h +++ b/include/linux/node.h @@ -139,8 +139,7 @@ extern int register_cpu_under_node(unsigned int cpu, unsigned int nid); extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid); extern int register_mem_sect_under_node(struct memory_block *mem_blk, void *arg); -extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, - unsigned long phys_index); +extern int unregister_memory_block_under_nodes(struct memory_block *mem_blk); extern int register_memory_node_under_compute_node(unsigned int mem_nid, unsigned int cpu_nid, @@ -176,8 +175,7 @@ static inline int register_mem_sect_under_node(struct memory_block *mem_blk, { return 0; } -static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, - unsigned long phys_index) +static inline int unregister_memory_block_under_nodes(struct memory_block *mem_blk) { return 0; } diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 107f72952347..527fe4f9c620 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -519,8 +519,6 @@ static void __remove_section(struct zone *zone, struct mem_section *ms, if (WARN_ON_ONCE(!valid_section(ms))) return; - unregister_memory_section(ms); - scn_nr = __section_nr(ms); start_pfn = section_nr_to_pfn((unsigned long)scn_nr); __remove_zone(zone, start_pfn); @@ -1844,6 +1842,9 @@ void __ref __remove_memory(int nid, u64 start, u64 size) memblock_free(start, size); memblock_remove(start, size); + /* remove memory block devices before removing memory */ + hotplug_memory_unregister(start, size); + arch_remove_memory(nid, start, size, NULL); __release_memory_resource(start, size);
Let's factor out removing of memory block devices, which is only necessary for memory added via add_memory() and friends that created memory block devices. Remove the devices before calling arch_remove_memory(). This finishes factoring out memory block device handling from arch_add_memory() and arch_remove_memory(). Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: David Hildenbrand <david@redhat.com> Cc: "mike.travis@hpe.com" <mike.travis@hpe.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andrew Banman <andrew.banman@hpe.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Mark Brown <broonie@kernel.org> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Oscar Salvador <osalvador@suse.de> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Pavel Tatashin <pavel.tatashin@microsoft.com> Cc: Arun KS <arunks@codeaurora.org> Cc: Mathieu Malaterre <malat@debian.org> Signed-off-by: David Hildenbrand <david@redhat.com> --- drivers/base/memory.c | 39 +++++++++++++++++++-------------------- drivers/base/node.c | 11 ++++++----- include/linux/memory.h | 2 +- include/linux/node.h | 6 ++---- mm/memory_hotplug.c | 5 +++-- 5 files changed, 31 insertions(+), 32 deletions(-)