On Wed, Oct 17, 2007 at 03:43:01PM -0400, Hrishikesh wrote:
> for the case where the kernel is patched, but NO_HZ is __not__ enabled,
> there is a do_nanosleep() every 100 or so us.
>
> setitimer(ITIMER_VIRTUAL, {it_interval={0, 0}, it_value={0, 0}},
> {it_interval={0, 0}, it_value={0, 0}}) = 0
> nanosleep({0, 0}, {0, 0}) = 0
Can you reproduce this with current mainline? I can't:
1194371604.120203 setitimer(ITIMER_VIRTUAL, {it_interval={0, 0}, it_value={0,
10000}}, NULL) = 0
1194371604.120256 setitimer(ITIMER_VIRTUAL, {it_interval={0, 0}, it_value={0,
0}}, {it_interval={0, 0}, it_value={0, 11998}}) = 0
1194371604.120306 nanosleep({0, 11998000}, {0, 11998000}) = 0
It's correctly reading the current alarm and sleeping for that long.
It could be more efficient, but this isn't a busy loop.
Jeff
--
Work email - jdike at linux dot intel dot com
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