Re: BKL in tty code?

From: David C. Hansen (
Date: Wed Jan 30 2002 - 16:10:13 EST

Robert Love wrote:

>On Wed, 2002-01-30 at 13:49, Alex Khripin wrote:
>>I'm very much a newbie, and I'm wondering about the big kernel locks
>>in tty_io.c. What exactly are the locks in the read and write for? Is the
>>tty device that contested? Couldn't a finer grained lock be used?
>There is probably some cleanup that is possible, but really getting the
>thing in gear (which means no BKL, which is probably the hardest part to
>rip out) require some level of rewrite.
People working on BKL removal tend to ignore these types of things (I
know I do). We concentrate on scalability and performance and the tty
code isn't exactly a high point of lock contention.

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