From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>, "Ted Ts'o" <tytso@mit.edu>,
Greg KH <greg@kroah.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: printk() vs tty_io
Date: Thu, 15 Dec 2011 21:22:01 +0000 [thread overview]
Message-ID: <20111215212201.3b1ab204@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <CA+55aFwhFoU5Fp_VTMtVU7XFMZiNvy1J7n7YJsVBu+-k-EH0Nw@mail.gmail.com>
> - Make a special "debug printk" that is not synchronous. Just make it
> buffer things, and have it actually print out from a worker thread or
> whatever. This one *only* takes the lock for that buffer itself, and
> works everywhere. We could probably even do tricks to make it
> NMI-safe.
No buffer lock needed within limits - our kfifo implementation doesn't
need them on sensible hardware.
Alan
next prev parent reply other threads:[~2011-12-15 21:21 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-13 19:33 Peter Zijlstra
2011-12-13 23:52 ` Linus Torvalds
2011-12-14 9:38 ` Peter Zijlstra
2011-12-14 10:43 ` Alan Cox
2011-12-14 10:56 ` Peter Zijlstra
2011-12-14 14:05 ` Ted Ts'o
2011-12-14 14:23 ` Peter Zijlstra
2011-12-14 15:54 ` Linus Torvalds
2011-12-15 9:56 ` Peter Zijlstra
2011-12-15 10:32 ` Alan Cox
2011-12-15 10:55 ` Peter Zijlstra
2011-12-15 17:08 ` Linus Torvalds
2011-12-15 18:07 ` Ingo Molnar
2011-12-15 21:22 ` Alan Cox [this message]
2011-12-16 13:25 ` Peter Zijlstra
2011-12-15 19:02 ` Greg KH
2011-12-14 6:59 ` Ingo Molnar
2011-12-14 9:40 ` [PATCH] arch, early_printk: Consolidate early_printk() implementations Peter Zijlstra
2011-12-14 9:41 ` [PATCH] lockdep: Enable earlyprintk output Peter Zijlstra
2011-12-14 9:43 ` printk() vs tty_io Peter Zijlstra
2011-12-14 9:46 ` Ingo Molnar
2011-12-21 12:03 ` Stijn Devriendt
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