From: Michael Ellerman <mpe@ellerman.id.au>
To: David Hildenbrand <david@redhat.com>, linux-kernel@vger.kernel.org
Cc: David Hildenbrand <david@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
Marek Kedzierski <mkedzier@redhat.com>,
Hui Zhu <teawater@gmail.com>,
Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
Wei Yang <richard.weiyang@linux.alibaba.com>,
Oscar Salvador <osalvador@suse.de>,
Michal Hocko <mhocko@kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
Pavel Tatashin <pasha.tatashin@soleen.com>,
virtualization@lists.linux-foundation.org, linux-mm@kvack.org,
linux-acpi@vger.kernel.org,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Nathan Lynch <nathanl@linux.ibm.com>,
Laurent Dufour <ldufour@linux.ibm.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Scott Cheloha <cheloha@linux.ibm.com>,
Anton Blanchard <anton@ozlabs.org>,
linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev
Subject: Re: [PATCH v1 05/12] mm/memory_hotplug: remove nid parameter from remove_memory() and friends
Date: Tue, 08 Jun 2021 21:11:57 +1000 [thread overview]
Message-ID: <87y2bkehky.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <20210607195430.48228-6-david@redhat.com>
David Hildenbrand <david@redhat.com> writes:
> There is only a single user remaining. We can simply try to offline all
> online nodes - which is fast, because we usually span pages and can skip
> such nodes right away.
That makes me slightly nervous, because our big powerpc boxes tend to
trip on these scaling issues before others.
But the spanned pages check is just:
void try_offline_node(int nid)
{
pg_data_t *pgdat = NODE_DATA(nid);
...
if (pgdat->node_spanned_pages)
return;
So I guess that's pretty cheap, and it's only O(nodes), which should
never get that big.
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Len Brown <lenb@kernel.org>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Vishal Verma <vishal.l.verma@intel.com>
> Cc: Dave Jiang <dave.jiang@intel.com>
> Cc: "Michael S. Tsirkin" <mst@redhat.com>
> Cc: Jason Wang <jasowang@redhat.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Nathan Lynch <nathanl@linux.ibm.com>
> Cc: Laurent Dufour <ldufour@linux.ibm.com>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
> Cc: Scott Cheloha <cheloha@linux.ibm.com>
> Cc: Anton Blanchard <anton@ozlabs.org>
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-acpi@vger.kernel.org
> Cc: nvdimm@lists.linux.dev
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
> .../platforms/pseries/hotplug-memory.c | 9 ++++-----
> drivers/acpi/acpi_memhotplug.c | 7 +------
> drivers/dax/kmem.c | 3 +--
> drivers/virtio/virtio_mem.c | 4 ++--
> include/linux/memory_hotplug.h | 10 +++++-----
> mm/memory_hotplug.c | 20 +++++++++----------
> 6 files changed, 23 insertions(+), 30 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
> index 8377f1f7c78e..4a9232ddbefe 100644
> --- a/arch/powerpc/platforms/pseries/hotplug-memory.c
> +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
> @@ -286,7 +286,7 @@ static int pseries_remove_memblock(unsigned long base, unsigned long memblock_si
> {
> unsigned long block_sz, start_pfn;
> int sections_per_block;
> - int i, nid;
> + int i;
>
> start_pfn = base >> PAGE_SHIFT;
>
> @@ -297,10 +297,9 @@ static int pseries_remove_memblock(unsigned long base, unsigned long memblock_si
>
> block_sz = pseries_memory_block_size();
> sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE;
> - nid = memory_add_physaddr_to_nid(base);
>
> for (i = 0; i < sections_per_block; i++) {
> - __remove_memory(nid, base, MIN_MEMORY_BLOCK_SIZE);
> + __remove_memory(base, MIN_MEMORY_BLOCK_SIZE);
> base += MIN_MEMORY_BLOCK_SIZE;
> }
>
> @@ -386,7 +385,7 @@ static int dlpar_remove_lmb(struct drmem_lmb *lmb)
>
> block_sz = pseries_memory_block_size();
>
> - __remove_memory(mem_block->nid, lmb->base_addr, block_sz);
> + __remove_memory(lmb->base_addr, block_sz);
> put_device(&mem_block->dev);
>
> /* Update memory regions for memory remove */
> @@ -638,7 +637,7 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb)
>
> rc = dlpar_online_lmb(lmb);
> if (rc) {
> - __remove_memory(nid, lmb->base_addr, block_sz);
> + __remove_memory(lmb->base_addr, block_sz);
> invalidate_lmb_associativity_index(lmb);
> } else {
> lmb->flags |= DRCONF_MEM_ASSIGNED;
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
cheers
next prev parent reply other threads:[~2021-06-08 11:12 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 19:54 [PATCH v1 00/12] mm/memory_hotplug: "auto-movable" online policy and memory groups David Hildenbrand
2021-06-07 19:54 ` [PATCH v1 01/12] mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range() David Hildenbrand
2021-06-07 19:54 ` [PATCH v1 02/12] mm: track present early pages per zone David Hildenbrand
2021-06-07 19:54 ` [PATCH v1 03/12] mm/memory_hotplug: introduce "auto-movable" online policy David Hildenbrand
2021-06-07 19:54 ` [PATCH v1 04/12] mm/memory_hotplug: remove nid parameter from arch_remove_memory() David Hildenbrand
2021-06-08 8:32 ` Catalin Marinas
2021-06-08 10:50 ` Michael Ellerman
2021-06-09 5:51 ` Heiko Carstens
2021-06-07 19:54 ` [PATCH v1 05/12] mm/memory_hotplug: remove nid parameter from remove_memory() and friends David Hildenbrand
2021-06-08 11:11 ` Michael Ellerman [this message]
2021-06-08 11:18 ` David Hildenbrand
2021-06-09 10:05 ` David Hildenbrand
2021-06-07 19:54 ` [PATCH v1 06/12] drivers/base/memory: "memory groups" to logically group memory blocks David Hildenbrand
2021-06-07 19:54 ` [PATCH v1 07/12] mm/memory_hotplug: track present pages in memory groups David Hildenbrand
2021-06-07 19:54 ` [PATCH v1 08/12] ACPI: memhotplug: memory resources cannot be enabled yet David Hildenbrand
2021-06-08 12:20 ` Rafael J. Wysocki
2021-06-07 19:54 ` [PATCH v1 09/12] ACPI: memhotplug: use a single static memory group for a single memory device David Hildenbrand
2021-06-08 12:20 ` Rafael J. Wysocki
2021-06-07 19:54 ` [PATCH v1 10/12] virtio-mem: use a single dynamic memory group for a single virtio-mem device David Hildenbrand
2021-06-07 19:54 ` [PATCH v1 11/12] mm/memory_hotplug: memory group aware "auto-movable" online policy David Hildenbrand
2021-06-07 19:54 ` [PATCH v1 12/12] mm/memory_hotplug: improved dynamic " David Hildenbrand
2021-06-08 9:42 ` [PATCH v1 00/12] mm/memory_hotplug: "auto-movable" online policy and memory groups Oscar Salvador
2021-06-08 10:12 ` David Hildenbrand
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