Messages in this thread | | | Date | Tue, 2 Mar 2021 10:50:32 -0800 | From | Roman Gushchin <> | Subject | Re: [PATCH] mm: memcontrol: fix kernel stack account |
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On Tue, Mar 02, 2021 at 03:37:33PM +0800, Muchun Song wrote: > The alloc_thread_stack_node() cannot guarantee that allocated stack pages > are in the same node when CONFIG_VMAP_STACK. Because we do not specify > __GFP_THISNODE to __vmalloc_node_range(). Fix it by caling > mod_lruvec_page_state() for each page one by one.
Hm, I actually wonder if it makes any sense to split the stack over multiple nodes? Maybe we should fix this instead?
> > Fixes: 991e7673859e ("mm: memcontrol: account kernel stack per node") > Signed-off-by: Muchun Song <songmuchun@bytedance.com> > --- > kernel/fork.c | 15 ++++++++++----- > 1 file changed, 10 insertions(+), 5 deletions(-) > > diff --git a/kernel/fork.c b/kernel/fork.c > index d66cd1014211..6e2201feb524 100644 > --- a/kernel/fork.c > +++ b/kernel/fork.c > @@ -379,14 +379,19 @@ static void account_kernel_stack(struct task_struct *tsk, int account) > void *stack = task_stack_page(tsk); > struct vm_struct *vm = task_stack_vm_area(tsk); > > + if (vm) { > + int i; > > - /* All stack pages are in the same node. */ > - if (vm) > - mod_lruvec_page_state(vm->pages[0], NR_KERNEL_STACK_KB, > - account * (THREAD_SIZE / 1024)); > - else > + BUG_ON(vm->nr_pages != THREAD_SIZE / PAGE_SIZE); > + > + for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) > + mod_lruvec_page_state(vm->pages[i], NR_KERNEL_STACK_KB, > + account * (PAGE_SIZE / 1024)); > + } else { > + /* All stack pages are in the same node. */ > mod_lruvec_kmem_state(stack, NR_KERNEL_STACK_KB, > account * (THREAD_SIZE / 1024)); > + } > } > > static int memcg_charge_kernel_stack(struct task_struct *tsk) > -- > 2.11.0 >
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