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Andrew Morton c67ad917cb percpu_counters(): use cpu notifiers 
per-cpu counters presently must iterate over all possible CPUs in the
exhaustive percpu_counter_sum().

But it can be much better to only iterate over the presently-online CPUs.  To
do this, we must arrange for an offlined CPU's count to be spilled into the
counter's central count.

We can do this for all percpu_counters in the machine by linking them into a
single global list and walking that list at CPU_DEAD time.

(I hope.  Might have race windows in which the percpu_counter_sum() count is
inaccurate?)

Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2007-07-16 09:05:41 -07:00
..
acpi Pull osi-now into release branch 2007-06-02 01:02:09 -04:00
asm-alpha fix alpha ISA support 2007-07-16 09:05:37 -07:00
asm-arm page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-arm26 ARM26: enable arbitary speed tty ioctls and split input/output speed 2007-07-16 09:05:38 -07:00
asm-avr32 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-blackfin Blackfin arch: Add peripheral io API to gpio header file 2007-07-12 17:06:45 +08:00
asm-cris etrax: enable arbitary speed setting on tty ports 2007-07-16 09:05:38 -07:00
asm-frv FRV: Connect up new syscalls 2007-07-16 09:05:37 -07:00
asm-generic sched: simplify sched_find_first_bit() 2007-07-09 18:52:00 +02:00
asm-h8300 h8300 entry.S update 2007-07-16 09:05:37 -07:00
asm-i386 fix jvc cdrom drive lockup 2007-07-16 09:05:40 -07:00
asm-ia64 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-m32r m32r: enable arbitary speed tty rate setting 2007-07-16 09:05:38 -07:00
asm-m68k page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-m68knommu PCI: remove pci_dac_dma_... APIs 2007-07-11 16:02:11 -07:00
asm-mips page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-parisc page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-powerpc page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-ppc page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-s390 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-sh page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-sh64 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-sparc page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-sparc64 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-um Add generic exit-time stack-depth checking to CONFIG_DEBUG_STACK_USAGE 2007-07-16 09:05:38 -07:00
asm-v850 v850: enable arbitary speed tty ioctls 2007-07-16 09:05:39 -07:00
asm-x86_64 page table handling cleanup 2007-07-16 09:05:36 -07:00
asm-xtensa page table handling cleanup 2007-07-16 09:05:36 -07:00
crypto [CRYPTO] cryptd: Add software async crypto daemon 2007-05-02 14:38:32 +10:00
keys [AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both 2007-04-26 15:48:28 -07:00
linux percpu_counters(): use cpu notifiers 2007-07-16 09:05:41 -07:00
math-emu Delete unused header file math-emu/extended.h 2007-05-08 11:15:05 -07:00
media V4L/DVB (5592): DMA: Correctly free resources on error, sync PCI streamed data 2007-05-09 10:12:42 -03:00
mtd UBI: Unsorted Block Images 2007-04-27 14:23:33 +03:00
net Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2007-07-15 16:50:46 -07:00
pcmcia PCMCIA-NETDEV : add new ID of lan&modem multifunction card 2007-07-08 22:16:39 -04:00
rdma IB/cm: Include HCA ACK delay in local ACK timeout 2007-07-10 21:50:05 -07:00
rxrpc [AF_RXRPC]: Delete the old RxRPC code. 2007-04-26 15:55:48 -07:00
scsi [SCSI] Remove unused method scsi_device_cancel 2007-07-14 16:01:16 -05:00
sound [ALSA] version 1.0.14 2007-05-31 11:03:27 +02:00
video atmel_lcdfb: AT91/AT32 LCD Controller framebuffer driver 2007-05-11 08:29:37 -07:00
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