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Message-ID: <alpine.LNX.2.00.1605250042020.31937@cbobk.fhfr.pm> Date: Wed, 25 May 2016 00:45:05 +0200 (CEST) From: Jiri Kosina <jikos@...nel.org> To: David Laight <David.Laight@...LAB.COM> cc: Josh Poimboeuf <jpoimboe@...hat.com>, "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>, Jessica Yu <jeyu@...hat.com>, Vojtech Pavlik <vojtech@...e.com>, Petr Mladek <pmladek@...e.com>, Peter Zijlstra <peterz@...radead.org>, "x86@...nel.org" <x86@...nel.org>, Heiko Carstens <heiko.carstens@...ibm.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...hat.com>, Andy Lutomirski <luto@...nel.org>, "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>, Jiri Slaby <jslaby@...e.cz>, Miroslav Benes <mbenes@...e.cz>, "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, Chris J Arges <chris.j.arges@...onical.com> 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
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