Messages in this thread | | | Date | Thu, 18 Jan 2018 23:03:24 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH v5 1/2] printk: Add console owner and waiter logic to load balance console writes |
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Hi!
> > By other words, this deadlock was there even before. Such > > deadlocks are prevented by using printk_deferred() in > > the sections guarded by the lock A. > > Petr, > > Please add this here: > > ==== > > To demonstrate the issue, this module has been shown to lock up a > system with 4 CPUs and a slow console (like a serial console). It is > also able to lock up a 8 CPU system with only a fast (VGA) console, by > passing in "loops=100". The changes in this commit prevent this module > from locking up the system. > > #include <linux/module.h> > #include <linux/delay.h> > #include <linux/sched.h> > #include <linux/mutex.h> > #include <linux/workqueue.h> > #include <linux/hrtimer.h>
Programs in commit messages. Not preffered way to distribute code, I'd say. What about putting it into kernel selftests directory or something like that? Pavel
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