]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
[PATCH] sched: new sched domain for representing multi-core
authorSiddha, Suresh B <suresh.b.siddha@intel.com>
Mon, 27 Mar 2006 09:15:22 +0000 (01:15 -0800)
committerLinus Torvalds <torvalds@g5.osdl.org>
Mon, 27 Mar 2006 16:44:43 +0000 (08:44 -0800)
commit1e9f28fa1eb9773bf65bae08288c6a0a38eef4a7
treeccfa4927ebc7a8f663f9ac9e7789a713a33253ff
parent77e4bfbcf071f795b54862455dce8902b3fc29c2
[PATCH] sched: new sched domain for representing multi-core

Add a new sched domain for representing multi-core with shared caches
between cores.  Consider a dual package system, each package containing two
cores and with last level cache shared between cores with in a package.  If
there are two runnable processes, with this appended patch those two
processes will be scheduled on different packages.

On such systems, with this patch we have observed 8% perf improvement with
specJBB(2 warehouse) benchmark and 35% improvement with CFP2000 rate(with 2
users).

This new domain will come into play only on multi-core systems with shared
caches.  On other systems, this sched domain will be removed by domain
degeneration code.  This new domain can be also used for implementing power
savings policy (see OLS 2005 CMP kernel scheduler paper for more details..
I will post another patch for power savings policy soon)

Most of the arch/* file changes are for cpu_coregroup_map() implementation.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
14 files changed:
arch/i386/Kconfig
arch/i386/kernel/cpu/common.c
arch/i386/kernel/cpu/intel_cacheinfo.c
arch/i386/kernel/smpboot.c
arch/x86_64/Kconfig
arch/x86_64/kernel/setup.c
arch/x86_64/kernel/smpboot.c
include/asm-i386/processor.h
include/asm-i386/topology.h
include/asm-x86_64/processor.h
include/asm-x86_64/smp.h
include/asm-x86_64/topology.h
include/linux/topology.h
kernel/sched.c