Re: [PATCH v3 2/2] prctl_set_mm: downgrade mmap_sem to read lock

2019-05-07 Thread Michal Hocko
On Thu 02-05-19 14:52:03, Michal Koutny wrote: > The commit a3b609ef9f8b ("proc read mm's {arg,env}_{start,end} with mmap > semaphore taken.") added synchronization of reading argument/environment > boundaries under mmap_sem. Later commit 88aa7cc688d4 ("mm: introduce > arg_lock to protect arg_start

Re: [PATCH v3 2/2] prctl_set_mm: downgrade mmap_sem to read lock

2019-05-06 Thread Kirill Tkhai
On 02.05.2019 15:52, Michal Koutný wrote: > The commit a3b609ef9f8b ("proc read mm's {arg,env}_{start,end} with mmap > semaphore taken.") added synchronization of reading argument/environment > boundaries under mmap_sem. Later commit 88aa7cc688d4 ("mm: introduce > arg_lock to protect arg_start|end

Re: [PATCH v3 2/2] prctl_set_mm: downgrade mmap_sem to read lock

2019-05-02 Thread Cyrill Gorcunov
On Thu, May 02, 2019 at 02:52:03PM +0200, Michal Koutný wrote: > The commit a3b609ef9f8b ("proc read mm's {arg,env}_{start,end} with mmap > semaphore taken.") added synchronization of reading argument/environment > boundaries under mmap_sem. Later commit 88aa7cc688d4 ("mm: introduce > arg_lock to p

[PATCH v3 2/2] prctl_set_mm: downgrade mmap_sem to read lock

2019-05-02 Thread Michal Koutný
The commit a3b609ef9f8b ("proc read mm's {arg,env}_{start,end} with mmap semaphore taken.") added synchronization of reading argument/environment boundaries under mmap_sem. Later commit 88aa7cc688d4 ("mm: introduce arg_lock to protect arg_start|end and env_start|end in mm_struct") avoided the coars