[lkml]   [2019]   [Jul]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] sched/core: Don't use dying mm as active_mm for kernel threads
On 7/26/19 7:45 PM, Waiman Long wrote:
> It was found that a dying mm_struct where the owning task has exited can
> stay on as active_mm of kernel threads as long as no other user tasks
> run on those CPUs that use it as active_mm. This prolongs the life time
> of dying mm holding up memory and other resources that cannot be freed.
> Fix that by forcing the kernel threads to use init_mm as the active_mm
> if the previous active_mm is dying.
> Signed-off-by: Waiman Long <>
> ---
> kernel/sched/core.c | 13 +++++++++++--
> mm/init-mm.c | 2 ++
> 2 files changed, 13 insertions(+), 2 deletions(-)

Sorry, I didn't realize that mm->owner depends on CONFIG_MEMCG. I will
need to refresh the patch and send out v2 when I am done testing.


 \ /
  Last update: 2019-07-27 03:59    [W:0.041 / U:4.880 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site