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* cpumask: remove cpumask_t from coreRusty Russell2009-03-30
| | | | | | | | | Impact: cleanup struct cpumask is nicer, and we use it to make where we've made code safe for CONFIG_CPUMASK_OFFSTACK=y. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* sched: convert struct cpupri_vec cpumask_var_t.Rusty Russell2008-11-24
| | | | | | | | | | | | | | | Impact: stack usage reduction, (future) size reduction for large NR_CPUS. Dynamically allocating cpumasks (when CONFIG_CPUMASK_OFFSTACK) saves space for small nr_cpu_ids but big CONFIG_NR_CPUS. The fact cpupro_init is called both before and after the slab is available makes for an ugly parameter unfortunately. We also use cpumask_any_and to get rid of a temporary in cpupri_find. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: fix the cpuprio count reallyThomas Gleixner2008-06-06
| | | | | | | | Peter pointed out that the last version of the "fix" was still one off under certain circumstances. Use BITS_TO_LONG instead to get an accurate result. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* sched: fix cpupri priocountGregory Haskins2008-06-06
| | | | | | | | | | | A rounding error was pointed out by Peter Zijlstra which would result in the structure holding priorities to be off by one. Signed-off-by: Gregory Haskins <ghaskins@novell.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* sched: use a 2-d bitmap for searching lowest-pri CPUGregory Haskins2008-06-06
The current code use a linear algorithm which causes scaling issues on larger SMP machines. This patch replaces that algorithm with a 2-dimensional bitmap to reduce latencies in the wake-up path. Signed-off-by: Gregory Haskins <ghaskins@novell.com> Acked-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>