From: Matthew D. <col...@us...> - 2005-05-19 20:09:42
|
Dinakar Guniguntala wrote: > Hello Andrew, > > The following patches add dynamic sched domains functionality that was > extensively discussed on lkml and lse-tech. > I would like to see this added to -mm > > o The main advantage with this feature is that it ensures that the scheduler > load balacing code only balances against the cpus that are in the sched > domain as defined by an exclusive cpuset and not all of the cpus in the > system. This removes any overhead due to load balancing code trying to > pull tasks outside of the cpu exclusive cpuset only to be prevented by > the tasks' cpus_allowed mask. > o cpu exclusive cpusets are useful for servers running orthogonal > workloads such as RT applications requiring low latency and HPC > applications that are throughput sensitive > > o It provides a new API partition_sched_domains in sched.c > that makes dynamic sched domains possible. > o cpu_exclusive cpusets sets are now associated with a sched domain. > Which means that the users can dynamically modify the sched domains > through the cpuset file system interface > o ia64 sched domain code has been updated to support this feature as well > o Currently, this does not support hotplug. (However some of my tests > indicate hotplug+preempt is currently broken) > o I have tested it extensively on x86. > o This should have very minimal impact on performance as none of > the fast paths are affected > > -Dinakar > > Signed-off-by: Dinakar Guniguntala <di...@in...> > Acked-by: Paul Jackson <pj...@sg...> > Acked-by: Nick Piggin <nic...@ya...> > > linux-2.6.12-rc4-mm1-1/include/linux/sched.h | 2 > linux-2.6.12-rc4-mm1-1/kernel/sched.c | 130 +++++++++++++++-------- > linux-2.6.12-rc4-mm1-2/Documentation/cpusets.txt | 16 ++ > linux-2.6.12-rc4-mm1-2/kernel/cpuset.c | 89 +++++++++++++-- > linux-2.6.12-rc4-mm1-3/arch/ia64/kernel/domain.c | 76 +++++++------ > 5 files changed, 225 insertions(+), 88 deletions(-) Looks good to me, Dinakar! Acked-by: Matthew Dobson <col...@us...> -Matt |