On 2021/8/23 17:15, Oscar Salvador wrote:
> On 2021-08-21 11:42, Miaohe Lin wrote:
>> If offline_pages failed after lru_cache_disable(), it forgot to do
>> lru_cache_enable() in error path. So we would have lru cache disabled
>> permanently in this case.
>>
>> Fixes: d479960e44f2 ("mm: disable LRU pagevec during the migration temporarily")
>> Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
>
> Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>
>
Many thanks for your review and reply. :)
> Should this go to stable?
> In case we fail to enable it again, we will bypass the pvec cache anytime we add a new page to the LRU which might lead to severe performance regression?
>
Agree with you. I think this should go to stable too.
>> ---
>> mm/memory_hotplug.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
>> index d986d3791986..9fd0be32a281 100644
>> --- a/mm/memory_hotplug.c
>> +++ b/mm/memory_hotplug.c
>> @@ -2033,6 +2033,7 @@ int __ref offline_pages(unsigned long start_pfn,
>> unsigned long nr_pages,
>> undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
>> memory_notify(MEM_CANCEL_OFFLINE, &arg);
>> failed_removal_pcplists_disabled:
>> + lru_cache_enable();
>> zone_pcp_enable(zone);
>> failed_removal:
>> pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n",
>
