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Groups > linux.kernel > #1252389
| From | Steven Rostedt <rostedt@goodmis.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v8 04/14] task_isolation: add initial support |
| Date | 2015-10-21 02:30 +0200 |
| Message-ID | <qlPrX-3b7-11@gated-at.bofh.it> (permalink) |
| References | <qlM13-6so-9@gated-at.bofh.it> <qlMaK-6E0-5@gated-at.bofh.it> <qlMaK-6E0-3@gated-at.bofh.it> <qlMDL-7sL-11@gated-at.bofh.it> <qlMDL-7sL-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, 20 Oct 2015 14:26:34 -0700 Andy Lutomirski <luto@amacapital.net> wrote: > I'm not a scheduler person, so I don't know. But "don't run me unless > I'm isolated" seems like a design that will, at best, only ever work > by dumb luck. You have to disable migration, avoid other runnable > tasks, hope that the kernel keeps working the way it did when you > wrote the patch, hope you continue to get lucky enough that you ever > get to user mode in the first place, etc. Since it only makes sense to run one isolated task per cpu (not more than one on the same CPU), I wonder if we should add a new interface for this, that would force everything else off the CPU that it requests. That is, you bind a task to a CPU, and then change it to SCHED_ISOLATED (or what not), and the kernel will force all other tasks off that CPU. Well, we would still have kernel threads, but that's a different matter. Also, doesn't RCU need to have a few ticks go by before it can safely disable itself from userspace? I recall something like that. Paul? -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [PATCH v8 04/14] task_isolation: add initial support Andy Lutomirski <luto@amacapital.net> - 2015-10-20 23:00 +0200
Re: [PATCH v8 04/14] task_isolation: add initial support Andy Lutomirski <luto@amacapital.net> - 2015-10-20 23:30 +0200
Re: [PATCH v8 04/14] task_isolation: add initial support Steven Rostedt <rostedt@goodmis.org> - 2015-10-21 02:30 +0200
Re: [PATCH v8 04/14] task_isolation: add initial support Chris Metcalf <cmetcalf@ezchip.com> - 2015-10-26 21:30 +0100
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