Messages in this thread | | | Date | Wed, 25 May 2016 00:45:05 +0200 (CEST) | From | Jiri Kosina <> | Subject | RE: livepatch: change to a per-task consistency model |
| |
On Tue, 24 May 2016, David Laight wrote:
> > > Related, please can we have a flag for the sleep and/or process so that > > > an uninterruptible sleep doesn't trigger the 'hung task' detector > > > > TASK_KILLABLE > > Not sure that does what I want. > It appears to allow some 'kill' actions to wake the process. > I'm sure I've looked at the 'hung task' code since 2007.
The trick is the
if (t->state == TASK_UNINTERRUPTIBLE)
test in check_hung_uninterruptible_tasks(). That makes sure that TASK_KILLABLE tasks (e.g. waiting on NFS I/O, but not limited only to that; feel free to set it whereever you need) are skipped. Please note that TASK_KILLABLE is actually a _mask_ that includes TASK_UNINTERRUPTIBLE as well; therefore the '==' test skips such tasks.
-- Jiri Kosina SUSE Labs
| |