On 2013/5/24 17:30, Tang Chen wrote:
> In memory hot-remove procedure, we free pagetable pages to buddy system.
> But for local pagetable pages, do not free them to buddy system because
> they were skipped in offline procedure. The memory block they reside in
> could have been offlined, and we won't offline it again.
>
> Signed-off-by: Tang Chen <tangc...@cn.fujitsu.com>
> ---
> mm/memory_hotplug.c | 8 ++++++++
> 1 files changed, 8 insertions(+), 0 deletions(-)
>
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 21d6fcb..c30e819 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -119,6 +119,14 @@ void __ref put_page_bootmem(struct page *page)
> INIT_LIST_HEAD(&page->lru);
>
> /*
> + * Do not free pages with local node kernel data (for now, just
> + * local pagetables) to the buddy system because we skipped
> + * these pages when offlining the corresponding block.
> + */
> + if (type == LOCAL_NODE_DATA)
> + return;
Hi Tang,
I think this should be check in free_pagetable(), like:
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 474e28f..08fe80e 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -725,7 +725,7 @@ static void __meminit free_pagetable(struct page *page, int
order)
if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
while (nr_pages--)
put_page_bootmem(page++);
- } else
+ } else if (magic != LOCAL_NODE_DATA)
__free_pages_bootmem(page, order);
} else
free_pages((unsigned long)page_address(page), order);
Thanks,
Jianguo Wu.
> +
> + /*
> * Please refer to comment for __free_pages_bootmem()
> * for why we serialize here.
> */
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