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Re: vm.ubc_direct

Le mar. 3 déc. 2019 à 18:59, Chuck Silvers <> a écrit :
On Mon, Dec 02, 2019 at 07:10:52PM +0000, Andrew Doran wrote:
> Hello,
> In light of the recent discussion, and having asked Jaromir his thoughts on
> the subject, we both think it's time to enable this by default, so it gets
> wider testing.  Is there a good reason not to?
> Cheers,
> Andrew

The current ubc_direct code still has the problem that I pointed out originally,
which is that it deadlocks if you read() or write() a page of a file into
a mapping of itself.  We should not enable this by default until that problem
is fixed.

Right, I completely forgot about this.

I have a small program which triggers the deadlock quite reliably. Never got around to actually add it into test suite because it caused problems also on other system I run it on.

Andrew, would you by chance be interested to look at this?


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