Re: [PATCH v2 1/2] sched: Add PF_MEMALLOC_NOLOCKDEP flag

[Peter Zijlstra]

On Thu, Jun 18, 2020 at 10:01:10AM +1000, Dave Chinner wrote:

> And, really, if we are playing "re-use existing bits" games because
> we've run out of process flags, all these memalloc flags should be
> moved to a new field in the task, say current->memalloc_flags. You
> could also move PF_SWAPWRITE, PF_LOCAL_THROTTLE, and PF_KSWAPD into
> that field as well as they are all memory allocation context process
> flags...

FWIW

There's still 23 bits free after task_struct::in_memstall. That word has
'current only' semantics, just like PF.