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Re: netbsd-5 deadlocks when memory is low
On Fri, Sep 02, 2011 at 12:55:24AM -0400, Mouse wrote:
> That won't fix it; it'll just make it less likely to deadlock. If
> there is nothing to flush _except_ to the user filesystem that wants
> memory, the system is still wedged.
Sure, but at least it will remove a whole set of deadlocks, where there
are vnode to flush on your root fs, but ioflush remain stuck on flushing
a vnode from a user fs.
> As a scenario less likely to occur, but more likely to deadlock if it
> does occur, consider a system configured with swap to a file that's on
> a userland filesystem, and then let all other swap (if any) fill up.
There are plenty of ways to make a system less able to cope with memory
sortage. I would like to improve the situation for setups where the
administrator made some effort to have a reliable system. For now I
have to way to avoid deadlocks on netbsd-5.
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