On Mon 01-06-15 19:51:05, Tetsuo Handa wrote:
[...]
> How can all fatal_signal_pending() "struct task_struct" get access to memory
> reserves when only one of fatal_signal_pending() "struct task_struct" has
> TIF_MEMDIE ?
Because of
/*
* If current has a pending SIGKILL or is exiting, then automatically
* select it. The goal is to allow it to allocate so that it may
* quickly exit and free its memory.
*
* But don't select if current has already released its mm and cleared
* TIF_MEMDIE flag at exit_mm(), otherwise an OOM livelock may occur.
*/
if (current->mm &&
(fatal_signal_pending(current) || task_will_free_mem(current))) {
mark_oom_victim(current);
goto out;
}
--
Michal Hocko
SUSE Labs
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