Re: [PATCH v9 1/8] drivers/base/memory: Introduce memory_block_{online,offline}

Michal Hocko
2021-04-20T09:23:12Z

On Fri 16-04-21 13:24:04, Oscar Salvador wrote:
> This is a preparatory patch that introduces two new functions:
> memory_block_online() and memory_block_offline().
>
> For now, these functions will only call online_pages() and offline_pages()
> respectively, but they will be later in charge of preparing the vmemmap
> pages, carrying out the initialization and proper accounting of such
> pages.
>
> Since memory_block struct contains all the information, pass this struct
> down the chain till the end functions.
>
> Signed-off-by: Oscar Salvador <osalvador@suse.de>
> Reviewed-by: David Hildenbrand <david@redhat.com>

Acked-by: Michal Hocko <mhocko@suse.com>

> ---
> drivers/base/memory.c | 33 +++++++++++++++++++++------------
> 1 file changed, 21 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
> index f35298425575..f209925a5d4e 100644
> --- a/drivers/base/memory.c
> +++ b/drivers/base/memory.c
> @@ -169,30 +169,41 @@ int memory_notify(unsigned long val, void *v)
> return blocking_notifier_call_chain(&memory_chain, val, v);
> }
>
> +static int memory_block_online(struct memory_block *mem)
> +{
> + unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
> + unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
> +
> + return online_pages(start_pfn, nr_pages, mem->online_type, mem->nid);
> +}
> +
> +static int memory_block_offline(struct memory_block *mem)
> +{
> + unsigned long start_pfn = section_nr_to_pfn(mem->start_section_nr);
> + unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
> +
> + return offline_pages(start_pfn, nr_pages);
> +}
> +
> /*
> * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is
> * OK to have direct references to sparsemem variables in here.
> */
> static int
> -memory_block_action(unsigned long start_section_nr, unsigned long action,
> - int online_type, int nid)
> +memory_block_action(struct memory_block *mem, unsigned long action)
> {
> - unsigned long start_pfn;
> - unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block;
> int ret;
>
> - start_pfn = section_nr_to_pfn(start_section_nr);
> -
> switch (action) {
> case MEM_ONLINE:
> - ret = online_pages(start_pfn, nr_pages, online_type, nid);
> + ret = memory_block_online(mem);
> break;
> case MEM_OFFLINE:
> - ret = offline_pages(start_pfn, nr_pages);
> + ret = memory_block_offline(mem);
> break;
> default:
> WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: "
> - "%ld\n", __func__, start_section_nr, action, action);
> + "%ld\n", __func__, mem->start_section_nr, action, action);
> ret = -EINVAL;
> }
>
> @@ -210,9 +221,7 @@ static int memory_block_change_state(struct memory_block *mem,
> if (to_state == MEM_OFFLINE)
> mem->state = MEM_GOING_OFFLINE;
>
> - ret = memory_block_action(mem->start_section_nr, to_state,
> - mem->online_type, mem->nid);
> -
> + ret = memory_block_action(mem, to_state);
> mem->state = ret ? from_state_req : to_state;
>
> return ret;
> --
> 2.16.3

--
Michal Hocko
SUSE Labs