lkml.org 
[lkml]   [2017]   [Feb]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v2 1/2] fork: free vmapped stacks in cache when cpus are offline
On Thu, Feb 9, 2017 at 5:38 PM, Michal Hocko <mhocko@kernel.org> wrote:
> On Thu 09-02-17 13:03:46, Hoeun Ryu wrote:
>> Using virtually mapped stack, kernel stacks are allocated via vmalloc.
>> In the current implementation, two stacks per cpu can be cached when
>> tasks are freed and the cached stacks are used again in task duplications.
>> but the cached stacks may remain unfreed even when cpu are offline.
>> By adding a cpu hotplug callback to free the cached stacks when a cpu
>> goes offline, the pages of the cached stacks are not wasted.
>>
>> Signed-off-by: Hoeun Ryu <hoeun.ryu@gmail.com>
>> ---
>> Changes in v2:
>> remove cpuhp callback for `starup`, only `teardown` callback is installed.
>>
>> kernel/fork.c | 21 +++++++++++++++++++++
>> 1 file changed, 21 insertions(+)
>>
>> diff --git a/kernel/fork.c b/kernel/fork.c
>> index 61284d8..7911ed2 100644
>> --- a/kernel/fork.c
>> +++ b/kernel/fork.c
>> @@ -170,6 +170,22 @@ void __weak arch_release_thread_stack(unsigned long *stack)
>> static DEFINE_PER_CPU(struct vm_struct *, cached_stacks[NR_CACHED_STACKS]);
>> #endif
>>
>> +static int free_vm_stack_cache(unsigned int cpu)
>> +{
>> + int i;
>> +
>> + for (i = 0; i < NR_CACHED_STACKS; i++) {
>> + struct vm_struct *vm_stack = this_cpu_read(cached_stacks[i]);
>
> the callbak will run on the given cpu so this_cpu_read will be in fact
> per_cpu_ptr(cached_stacks[i], cpu). Using this_cpu_read is just too
> confusing. Also you do want to make this function defined only for
> CONFIG_VMAP_STACK.
>

Sorry, Thank you for your correction. I will fix this.

>> + if (!vm_stack)
>> + continue;
>> +
>> + vfree(vm_stack->addr);
>> + this_cpu_write(cached_stacks[i], NULL);
>> + }
>> +
>> + return 0;
>> +}
>> +
>
> --
> Michal Hocko
> SUSE Labs

\
 
 \ /
  Last update: 2017-02-09 14:37    [W:0.081 / U:0.360 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site