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Date: Tue, 12 Jan 2010 04:49:48 +0100 From: Frederic Weisbecker <fweisbec@...il.com> To: John Kacur <jkacur@...hat.com> Cc: Thomas Gleixner <tglx@...utronix.de>, lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, Clark Williams <williams@...hat.com> Subject: Re: [PATCH 00/26] Convert locks that can't sleep in -rt to raw_spinlock On Tue, Jan 12, 2010 at 04:24:29AM +0100, Frederic Weisbecker wrote: > On Mon, Jan 11, 2010 at 10:26:30PM +0100, John Kacur wrote: > > Thomas: > > > > Now that your changes that free up the raw_spinlock name are upstream. > > (described below for other readers) > > > > http://lwn.net/Articles/365863/ > > http://lwn.net/Articles/366608/ > > > > I wanted to forward port the preempt-rt patches that convert locks to > > atomic_spinlocks (rt tree only) to the new scheme. > > > > The patches below are a result of that effort. > > Please queue these up for 2.6.34 upstream, and please pull for preempt-rt > > > > You can pull them from > > git://git.kernel.org/pub/scm/linux/kernel/git/jkacur/jk-2.6.git > > jk/v2.6.33-rc3-raw-spinlocks > > > > Thanks > > > > John Kacur (25): > > xtime_lock: Convert atomic_seqlock to raw_seqlock, fix up all users > > x86: Convert tlbstate_lock to raw_spinlock > > sched: Convert thread_group_cputimer lock to raw_spinlock > > x86: Convert ioapic_lock and vector_lock to raw_spinlocks > > x86: Convert i8259A_lock to raw_spinlock > > x86: Convert pci_config_lock to raw_spinlock > > i8253: Convert i8253_lock to raw_spinlock > > x86: Convert set_atomicity_lock to raw_spinlock > > ACPI: Convert c3_lock to raw_spinlock > > rtmutex: Convert wait_lock and pi_lock to raw_spinlock > > printk: Convert lock to raw_spinlock > > genirq: Convert locks to raw_spinlocks > > trace: Convert various locks to raw_spinlock > > clocksource: Convert watchdog_lock to raw_spinlock > > timer_stats: Convert to raw_spinlocks > > x86: kvm: Convert i8254/i8259 locks to raw_spinlock > > x86 - nmi: Convert nmi_lock to raw_spinlock > > cgroups: Convert cgroups release_list_lock to raw_spinlock > > proportions: Convert spinlocks to raw_spinlocks. > > percpu_counter: Convert to raw_spinlock > > oprofile: Convert to raw_spinlock > > vgacon: Convert vga console lock to raw_spinlock > > pci-access: Convert pci_lock to raw_spinlock > > kprobes: Convert to raw_spinlocks > > softlockup: Convert to raw_spinlocks > > > > Thomas Gleixner (1): > > seqlock: Create raw_seqlock > > > > arch/alpha/kernel/time.c | 4 +- > > arch/arm/kernel/time.c | 12 ++-- > > arch/arm/oprofile/common.c | 4 +- > > arch/arm/oprofile/op_model_mpcore.c | 4 +- > > arch/blackfin/kernel/time.c | 4 +- > > arch/cris/kernel/time.c | 4 +- > > arch/frv/kernel/time.c | 4 +- > > arch/h8300/kernel/time.c | 4 +- > > arch/ia64/kernel/time.c | 4 +- > > arch/ia64/xen/time.c | 4 +- > > arch/m32r/kernel/time.c | 4 +- > > arch/m68knommu/kernel/time.c | 4 +- > > arch/mips/include/asm/i8253.h | 2 +- > > arch/mips/kernel/i8253.c | 14 ++-- > > arch/mn10300/kernel/time.c | 4 +- > > arch/parisc/kernel/time.c | 8 +- > > arch/powerpc/kernel/time.c | 4 +- > > arch/sparc/kernel/pcic.c | 8 +- > > arch/sparc/kernel/time_32.c | 12 ++-- > > arch/x86/include/asm/i8253.h | 2 +- > > arch/x86/include/asm/i8259.h | 2 +- > > arch/x86/include/asm/pci_x86.h | 2 +- > > arch/x86/kernel/apic/io_apic.c | 106 +++++++++++++++++----------------- > > arch/x86/kernel/apic/nmi.c | 6 +- > > arch/x86/kernel/apm_32.c | 4 +- > > arch/x86/kernel/cpu/mtrr/generic.c | 6 +- > > arch/x86/kernel/i8253.c | 14 ++-- > > arch/x86/kernel/i8259.c | 30 +++++----- > > arch/x86/kernel/time.c | 4 +- > > arch/x86/kernel/visws_quirks.c | 6 +- > > arch/x86/kvm/i8254.c | 10 ++-- > > arch/x86/kvm/i8254.h | 2 +- > > arch/x86/kvm/i8259.c | 30 +++++----- > > arch/x86/kvm/irq.h | 2 +- > > arch/x86/kvm/x86.c | 8 +- > > arch/x86/mm/tlb.c | 8 +- > > arch/x86/oprofile/nmi_int.c | 4 +- > > arch/x86/pci/common.c | 2 +- > > arch/x86/pci/direct.c | 16 +++--- > > arch/x86/pci/mmconfig_32.c | 8 +- > > arch/x86/pci/numaq_32.c | 8 +- > > arch/x86/pci/pcbios.c | 8 +- > > arch/xtensa/kernel/time.c | 4 +- > > drivers/acpi/processor_idle.c | 10 ++-- > > drivers/block/hd.c | 4 +- > > drivers/input/gameport/gameport.c | 4 +- > > drivers/input/joystick/analog.c | 4 +- > > drivers/input/misc/pcspkr.c | 6 +- > > drivers/oprofile/event_buffer.c | 4 +- > > drivers/oprofile/oprofilefs.c | 6 +- > > drivers/pci/access.c | 34 ++++++------ > > drivers/video/console/vgacon.c | 42 +++++++------- > > include/linux/init_task.h | 2 +- > > include/linux/kprobes.h | 2 +- > > include/linux/oprofile.h | 2 +- > > include/linux/percpu_counter.h | 2 +- > > include/linux/proportions.h | 6 +- > > include/linux/ratelimit.h | 4 +- > > include/linux/rtmutex.h | 2 +- > > include/linux/sched.h | 4 +- > > include/linux/seqlock.h | 86 +++++++++++++++++++++++++++- > > include/linux/time.h | 2 +- > > kernel/cgroup.c | 18 +++--- > > kernel/hrtimer.c | 8 +- > > kernel/kprobes.c | 34 ++++++------ > > kernel/posix-cpu-timers.c | 8 +- > > kernel/printk.c | 42 +++++++------- > > kernel/sched_stats.h | 12 ++-- > > kernel/softlockup.c | 6 +- > > kernel/time.c | 8 +- > > kernel/time/clocksource.c | 26 ++++---- > > kernel/time/ntp.c | 8 +- > > kernel/time/tick-common.c | 8 +- > > kernel/time/tick-sched.c | 12 ++-- > > kernel/time/timekeeping.c | 50 ++++++++-------- > > kernel/time/timer_stats.c | 6 +- > > kernel/trace/ring_buffer.c | 52 +++++++++--------- > > kernel/trace/trace.c | 10 ++-- > > kernel/trace/trace_irqsoff.c | 6 +- > > lib/percpu_counter.c | 18 +++--- > > lib/proportions.c | 12 ++-- > > lib/ratelimit.c | 4 +- > > sound/drivers/pcsp/pcsp.h | 2 +- > > sound/drivers/pcsp/pcsp_input.c | 4 +- > > sound/drivers/pcsp/pcsp_lib.c | 12 ++-- > > 85 files changed, 535 insertions(+), 457 deletions(-) > > > > Looking at this whole patchset. I have the feeling the > changelogs don't tell us much about why we do that. > > I mean, I understand the general purpose of this patchset, > but taken invidually, some of them make me stuck into > existential questions. > > Could you just at least put a one liner detailed and > individual clue in the changelogs that tells us why a > pointed spinlock can not sleep in preempt_rt? And may > be a comment in the code? There are places where it > is pretty obvious, such as the rq lock. But some > others... > > Or may be I'm just too ignorant and these sleeping > in rt places are just simply damn too obvious to deserve > any individual words... :-) > > Thanks. > And please add people working on these files in Cc. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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