Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist

[Andrew Morton]

On Tue, 9 Jan 2007 15:39:26 +0530
Srivatsa Vaddagiri <vatsa@xxxxxxxxxx> wrote:

> I just hope the latency of freeze_processes() is tolerable ..

It'll be roughly proportional to the number of processes, I guess: if we
have 100,000 processes (or threads) doing sleep(1000000) then yeah, it'll
take some time to wake them all up and capture them in refrigerator().

But I suspect a suitable fix for any problems which arise there is to
implement gang-offlining and onlining, rather than the present
one-cpu-at-a-time.  That'd be pretty simple to do: we already have sysfs
interfaces which take a cpumask.
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