* Robin Holt <[email protected]> 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 <[email protected]> > Cc: H. Peter Anvin <[email protected]> > Cc: Russ Anderson <[email protected]> > Cc: Robin Holt <[email protected]> > Cc: Russell King <[email protected]> > Cc: Guan Xuetao <[email protected]> > Cc: Linux Kernel Mailing List <[email protected]> > Cc: the arch/x86 maintainers <[email protected]> > Cc: Arm Mailing List <[email protected]>
Looks nice now to me. For the x86 bits: Acked-by: Ingo Molnar <[email protected]> Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
