David Miller wrote:
From: Martin Devera <[EMAIL PROTECTED]>
Date: Mon, 18 Feb 2008 09:03:52 +0100
aha, ok, I'm not so informed about crossplatform issues.
I was also thining about looking at jiffies value and stop once
it is startjiffy+2, but with NO_HZ introduction, are jiffies
still incremented ?
There should always be at least once cpu tasked with incrementing
jiffies. Lots of stuff would break if not :-)
Aha ok, so that when (at least one) cpu is busy then I can count on
jiffies incrementing via do_timer, can't I ?
So that I'd remove the loop limit altogether but limiting it to
1 or 2 jiffies to prevent livelock.
Like
max_jiff = jiffies+2; /* not +1 at we could be at +0.9999 now */
while (jiffies<max_jiff) do_hard_potentionaly_long_work();
if (more_work) schedule_to_next_jiffie();
This will keep event queue work load under 66% of system load which
seems reasonable to me.
Would you accept such solution ?
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