* Robin Holt <h...@sgi.com> wrote:
> We recently noticed that reboot of a 1024 cpu machine takes approx 16
> minutes of just stopping the cpus. The slowdown was tracked to commit
> f96972f.
>
> The current implementation does all the work of hot removing the cpus
> before halting the system. We are switching to just migrating to the
> reboot_cpu and then continuing with shutdown/reboot.
>
> The patch set is broken into eleven parts. The first two are planned for
> the stable release. The others move the halt/shutdown/reboot related
> functions to their own kernel/reboot.c file and then move the handling
> of the kernel reboot= kernel parameter to generic kernel code.
>
>
> Changes since -v8
> - Changes reboot_cpu on stack to cpu to fix bug noticed by Russell King.
>
> - Switched unicore32 and arm from using REBOOT_WARM/COLD to HARD/SOFT.
>
> - Fixed case statement bug.
>
> - Went to using simple_strtoul for parsing reboot_cpu=smp###.
>
> - Made parsing of reboot= not use any #ifdef'd code.
>
> Changes since -v7.
> - Fixed authorship for first patch.
>
> - Rebased to Linus' current tree (51a26ae7a).
>
> Changes since -v6.
> - Cross compiled all arm architectures (using v3.9 kernel. Fails with
> current).
>
> - Added a #define for non-hotplug case.
>
> - Add #define for PF_THREAD_BOUND as compatibility to make stable easier.
>
> - Fixup s/reboot_cpu_id/reboot_cpu/
>
> - Add include of linux/uaccess.h to allow building on arm.
>
> - Removed last remaining checkpatch.pl line length warning on
> kernel/reboot.c.
>
> - Fixed the duplicate handling or the reboot= kernel parameter.
>
> Changes since -v5.
> - Moved the arch/x86 reboot= up to the generic kernel code.
>
> Changes since -v4.
> - Integrated Srivatsa S. Bhat creating cpu_hotplug_disable()
> function
>
> - Integrated comments by Srivatsa S. Bhat.
>
> - Made one more comment consistent with others in function.
>
> Changes since -v3.
> - Added a tested-by for the original reporter.
>
> - Fix compile failure found by Joe Perches.
>
> - Integrated comments by Joe Perches.
>
>
> To: Andrew Morton <a...@linux-foundation.org>
> Cc: H. Peter Anvin <h...@zytor.com>
> Cc: Russ Anderson <r...@sgi.com>
> Cc: Robin Holt <h...@sgi.com>
> Cc: Russell King <li...@arm.linux.org.uk>
> Cc: Guan Xuetao <g...@mprc.pku.edu.cn>
> Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
> Cc: the arch/x86 maintainers <x...@kernel.org>
> Cc: Arm Mailing List <linux-arm-ker...@lists.infradead.org>
Looks nice now to me. For the x86 bits:
Acked-by: Ingo Molnar <mi...@kernel.org>
Thanks,
Ingo
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