Messages in this thread | | | Date | Fri, 10 Feb 2017 16:34:41 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [PATCH v3] fork: free vmapped stacks in cache when cpus are offline |
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On Sat, 11 Feb 2017, Hoeun Ryu wrote:
> On Fri, Feb 10, 2017 at 11:41 PM, Michal Hocko <mhocko@kernel.org> wrote: > > On Fri 10-02-17 23:31:41, Hoeun Ryu wrote: > >> On Fri, Feb 10, 2017 at 9:05 PM, Michal Hocko <mhocko@kernel.org> wrote: > >> > On Fri 10-02-17 17:32:07, Hoeun Ryu wrote: > > [...] > >> >> static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node) > >> >> @@ -456,6 +474,11 @@ void __init fork_init(void) > >> >> for (i = 0; i < UCOUNT_COUNTS; i++) { > >> >> init_user_ns.ucount_max[i] = max_threads/2; > >> >> } > >> >> + > >> >> +#ifdef CONFIG_VMAP_STACK > >> >> + cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "vm_stack_cache", > >> >> + NULL, free_vm_stack_cache); > >> >> +#endif > >> > > >> > I am not familiar the new hotplug infrastructure so I might be missing > >> > something. CPUHP_AP_ONLINE_DYN will allocate a state which is has only > >> > 30 slots available.
That's enough and when we hit that limit we just up it.
> >> > The name also suggests this will be called on an online event.
The states are symmetric.
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