Peter Williams wrote:
Andrew Morton wrote:
"Siddha, Suresh B" <[email protected]> wrote:
b) On a lightly loaded system, this can result in HT scheduler
optimizations
being disabled in presence of low priority tasks... in this case,
they(low
priority ones) can end up running on the same package, even in the
presence of other idle packages.. Though this is not as serious as
"a" above...
I think that this issue comes under the heading of "Result of better
nice enforcement" which is the purpose of the patch :-).
On the assumption that this enforcement is considered to be too
vigorous, I think that it is also amenable to a fix based on a new
biased_load() function by replacing the (*imbalance < SCHED_LOAD_SCALE)
test with (biased_load(*imbalance, busiest) == 0) and (possibly) some
modifications within the if statement's body (most notably replacing the
NICE_TO_BIAS_PRIO(0) expressions with (busiest->prio_bias /
busiest->nr_running) or something similar).
This change would cause no change in functionality in the case where all
tasks are nice==0.
Peter
--
Peter Williams [email protected]
"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
