0ec9fab3d1
Make the idle balancer more agressive, to improve a x264 encoding workload provided by Jason Garrett-Glaser: NEXT_BUDDY NO_LB_BIAS encoded 600 frames, 252.82 fps, 22096.60 kb/s encoded 600 frames, 250.69 fps, 22096.60 kb/s encoded 600 frames, 245.76 fps, 22096.60 kb/s NO_NEXT_BUDDY LB_BIAS encoded 600 frames, 344.44 fps, 22096.60 kb/s encoded 600 frames, 346.66 fps, 22096.60 kb/s encoded 600 frames, 352.59 fps, 22096.60 kb/s NO_NEXT_BUDDY NO_LB_BIAS encoded 600 frames, 425.75 fps, 22096.60 kb/s encoded 600 frames, 425.45 fps, 22096.60 kb/s encoded 600 frames, 422.49 fps, 22096.60 kb/s Peter pointed out that this is better done via newidle_idx, not via LB_BIAS, newidle balancing should look for where there is load _now_, not where there was load 2 ticks ago. Worst-case latencies are improved as well as no buddies means less vruntime spread. (as per prior lkml discussions) This change improves kbuild-peak parallelism as well. Reported-by: Jason Garrett-Glaser <darkshikari@gmail.com> Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1253011667.9128.16.camel@marge.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
#ifndef _ASM_SH_TOPOLOGY_H
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#define _ASM_SH_TOPOLOGY_H
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#ifdef CONFIG_NUMA
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/* sched_domains SD_NODE_INIT for sh machines */
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#define SD_NODE_INIT (struct sched_domain) { \
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.parent = NULL, \
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.child = NULL, \
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.groups = NULL, \
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.min_interval = 8, \
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.max_interval = 32, \
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.busy_factor = 32, \
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.imbalance_pct = 125, \
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.cache_nice_tries = 2, \
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.busy_idx = 3, \
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.idle_idx = 2, \
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.newidle_idx = 0, \
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.wake_idx = 0, \
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.forkexec_idx = 1, \
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.flags = SD_LOAD_BALANCE \
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| SD_BALANCE_FORK \
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| SD_BALANCE_EXEC \
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| SD_BALANCE_WAKE \
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| SD_BALANCE_NEWIDLE \
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| SD_SERIALIZE, \
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.last_balance = jiffies, \
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.balance_interval = 1, \
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.nr_balance_failed = 0, \
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}
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#define cpu_to_node(cpu) ((void)(cpu),0)
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#define parent_node(node) ((void)(node),0)
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#define node_to_cpumask(node) ((void)node, cpu_online_map)
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#define cpumask_of_node(node) ((void)node, cpu_online_mask)
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#define pcibus_to_node(bus) ((void)(bus), -1)
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#define cpumask_of_pcibus(bus) (pcibus_to_node(bus) == -1 ? \
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CPU_MASK_ALL_PTR : \
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cpumask_of_node(pcibus_to_node(bus)))
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#endif
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#include <asm-generic/topology.h>
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#endif /* _ASM_SH_TOPOLOGY_H */
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