mirror of
https://github.com/edk2-porting/linux-next.git
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64c7c8f885
Make some changes to the NEED_RESCHED and POLLING_NRFLAG to reduce confusion, and make their semantics rigid. Improves efficiency of resched_task and some cpu_idle routines. * In resched_task: - TIF_NEED_RESCHED is only cleared with the task's runqueue lock held, and as we hold it during resched_task, then there is no need for an atomic test and set there. The only other time this should be set is when the task's quantum expires, in the timer interrupt - this is protected against because the rq lock is irq-safe. - If TIF_NEED_RESCHED is set, then we don't need to do anything. It won't get unset until the task get's schedule()d off. - If we are running on the same CPU as the task we resched, then set TIF_NEED_RESCHED and no further action is required. - If we are running on another CPU, and TIF_POLLING_NRFLAG is *not* set after TIF_NEED_RESCHED has been set, then we need to send an IPI. Using these rules, we are able to remove the test and set operation in resched_task, and make clear the previously vague semantics of POLLING_NRFLAG. * In idle routines: - Enter cpu_idle with preempt disabled. When the need_resched() condition becomes true, explicitly call schedule(). This makes things a bit clearer (IMO), but haven't updated all architectures yet. - Many do a test and clear of TIF_NEED_RESCHED for some reason. According to the resched_task rules, this isn't needed (and actually breaks the assumption that TIF_NEED_RESCHED is only cleared with the runqueue lock held). So remove that. Generally one less locked memory op when switching to the idle thread. - Many idle routines clear TIF_POLLING_NRFLAG, and only set it in the inner most polling idle loops. The above resched_task semantics allow it to be set until before the last time need_resched() is checked before going into a halt requiring interrupt wakeup. Many idle routines simply never enter such a halt, and so POLLING_NRFLAG can be always left set, completely eliminating resched IPIs when rescheduling the idle task. POLLING_NRFLAG width can be increased, to reduce the chance of resched IPIs. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Con Kolivas <kernel@kolivas.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> |
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| .. | ||
| asm-offsets.c | ||
| auxio.c | ||
| binfmt_aout32.c | ||
| binfmt_elf32.c | ||
| central.c | ||
| chmc.c | ||
| cpu.c | ||
| devices.c | ||
| dtlb_backend.S | ||
| dtlb_base.S | ||
| dtlb_prot.S | ||
| ebus.c | ||
| entry.S | ||
| etrap.S | ||
| head.S | ||
| idprom.c | ||
| init_task.c | ||
| ioctl32.c | ||
| iommu_common.c | ||
| iommu_common.h | ||
| irq.c | ||
| isa.c | ||
| itlb_base.S | ||
| kprobes.c | ||
| ktlb.S | ||
| Makefile | ||
| module.c | ||
| pci_common.c | ||
| pci_impl.h | ||
| pci_iommu.c | ||
| pci_psycho.c | ||
| pci_sabre.c | ||
| pci_schizo.c | ||
| pci.c | ||
| power.c | ||
| process.c | ||
| ptrace.c | ||
| rtrap.S | ||
| sbus.c | ||
| semaphore.c | ||
| setup.c | ||
| signal32.c | ||
| signal.c | ||
| smp.c | ||
| sparc64_ksyms.c | ||
| starfire.c | ||
| sunos_ioctl32.c | ||
| sys32.S | ||
| sys_sparc32.c | ||
| sys_sparc.c | ||
| sys_sunos32.c | ||
| systbls.S | ||
| time.c | ||
| trampoline.S | ||
| traps.c | ||
| ttable.S | ||
| una_asm.S | ||
| unaligned.c | ||
| us2e_cpufreq.c | ||
| us3_cpufreq.c | ||
| vmlinux.lds.S | ||
| winfixup.S | ||