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

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