diff options
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 63b2e46b6555..e0a561c550b3 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -596,8 +596,7 @@ void generic_online_page(struct page *page, unsigned int order) * so we should map it first. This is better than introducing a special * case in page freeing fast path. */ - if (debug_pagealloc_enabled_static()) - kernel_map_pages(page, 1 << order, 1); + debug_pagealloc_map_pages(page, 1 << order); __free_pages_core(page, order); totalram_pages_add(1UL << order); #ifdef CONFIG_HIGHMEM @@ -1304,7 +1303,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) if (WARN_ON(PageLRU(page))) isolate_lru_page(page); if (page_mapped(page)) - try_to_unmap(page, TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS); + try_to_unmap(page, TTU_IGNORE_MLOCK); continue; } @@ -1492,13 +1491,19 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) } node = zone_to_nid(zone); + /* + * Disable pcplists so that page isolation cannot race with freeing + * in a way that pages from isolated pageblock are left on pcplists. + */ + zone_pcp_disable(zone); + /* set above range as isolated */ ret = start_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE, MEMORY_OFFLINE | REPORT_FAILURE); if (ret) { reason = "failure to isolate range"; - goto failed_removal; + goto failed_removal_pcplists_disabled; } arg.start_pfn = start_pfn; @@ -1550,21 +1555,8 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) goto failed_removal_isolated; } - /* - * per-cpu pages are drained in start_isolate_page_range, but if - * there are still pages that are not free, make sure that we - * drain again, because when we isolated range we might - * have raced with another thread that was adding pages to pcp - * list. - * - * Forward progress should be still guaranteed because - * pages on the pcp list can only belong to MOVABLE_ZONE - * because has_unmovable_pages explicitly checks for - * PageBuddy on freed pages on other zones. - */ ret = test_pages_isolated(start_pfn, end_pfn, MEMORY_OFFLINE); - if (ret) - drain_all_pages(zone); + } while (ret); /* Mark all sections offline and remove free pages from the buddy. */ @@ -1580,6 +1572,8 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages; spin_unlock_irqrestore(&zone->lock, flags); + zone_pcp_enable(zone); + /* removal success */ adjust_managed_page_count(pfn_to_page(start_pfn), -nr_pages); zone->present_pages -= nr_pages; @@ -1612,6 +1606,8 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) failed_removal_isolated: undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); memory_notify(MEM_CANCEL_OFFLINE, &arg); +failed_removal_pcplists_disabled: + zone_pcp_enable(zone); failed_removal: pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", (unsigned long long) start_pfn << PAGE_SHIFT, |