Re: [PATCH 2/3] mm: drop oom code from exit_mmap

[Shuah Khan <skhan@linuxfoundation.org>]

On 5/9/22 9:00 PM, Suren Baghdasaryan wrote:
> With the oom-killer being able to operate on locked pages, exit_mmap
> does not need to ensure that oom_reap_task_mm is done before it can
> proceed. Instead it can rely on mmap_lock write lock to prevent
> oom-killer from operating on the vma tree while it's freeing page
> tables. exit_mmap can hold mmap_lock read lock when unmapping vmas
> and then take mmap_lock write lock before freeing page tables.
> 
> Signed-off-by: Suren Baghdasaryan <surenb@google.com>
> ---
>   include/linux/oom.h |  2 --
>   mm/mmap.c           | 25 ++++++-------------------
>   mm/oom_kill.c       |  2 +-
>   3 files changed, 7 insertions(+), 22 deletions(-)
> 

How does this improve the test? Include the information on why this
change is needed as opposed describing what this does?

thanks,
-- Shuah