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SubjectRe: [PATCH v1 05/12] mm/memory_hotplug: remove nid parameter from remove_memory() and friends
Date
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

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