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8311c29d40
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NeilBrown 8311c29d40 md: reduce CPU wastage on idle md array with a write-intent bitmap 
On an md array with a write-intent bitmap, a thread wakes up every few seconds
and scans the bitmap looking for work to do.  If the array is idle, there will
be no work to do, but a lot of scanning is done to discover this.

So cache the fact that the bitmap is completely clean, and avoid scanning the
whole bitmap when the cache is known to be clean.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-04 16:35:17 -08:00
..
acpi ACPI, cpuidle: Clarify C-state description in sysfs 2008-02-14 00:09:55 -05:00
asm-alpha CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-arm Kprobes: indicate kretprobe support in Kconfig 2008-03-04 16:35:11 -08:00
asm-avr32 AVR32: Define PAGE_SHARED 2008-02-13 14:44:03 +01:00
asm-blackfin Add pgtable_t to remaining nommu architectures 2008-02-09 11:08:33 -08:00
asm-cris cris: correct syscall numbers in unistd.h for timerfd_settime and timerfd_gettime 2008-03-04 16:35:16 -08:00
asm-frv FRV: Change the timerfd syscalls to be the same as i386 2008-02-20 19:58:16 -08:00
asm-generic percpu: fix DEBUG_PREEMPT per_cpu checking 2008-02-23 12:09:28 -08:00
asm-h8300 h8300: IRQ handling update 2008-02-23 17:12:16 -08:00
asm-ia64 Kprobes: indicate kretprobe support in Kconfig 2008-03-04 16:35:11 -08:00
asm-m32r CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-m68k m68k{,nommu}: Wire up new timerfd syscalls 2008-03-04 08:04:11 -08:00
asm-m68knommu m68k{,nommu}: Wire up new timerfd syscalls 2008-03-04 08:04:11 -08:00
asm-mips Alchemy: compile fix 2008-02-24 20:03:42 +01:00
asm-mn10300 MN10300: define SO_MARK 2008-02-23 17:12:13 -08:00
asm-parisc CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
asm-powerpc Kprobes: indicate kretprobe support in Kconfig 2008-03-04 16:35:11 -08:00
asm-ppc [POWERPC] Fix arch/ppc compilation - add typedef for pgtable_t 2008-02-14 22:11:02 +11:00
asm-s390 Kprobes: indicate kretprobe support in Kconfig 2008-03-04 16:35:11 -08:00
asm-sh serial: Move asm-sh/sci.h to linux/serial_sci.h. 2008-02-26 14:52:45 +09:00
asm-sparc [SPARC]: Merge asm-sparc{,64}/a.out.h 2008-02-09 22:25:50 -08:00
asm-sparc64 Kprobes: indicate kretprobe support in Kconfig 2008-03-04 16:35:11 -08:00
asm-um uml: x86_64 should copy %fs during fork 2008-02-08 09:22:43 -08:00
asm-v850 Add pgtable_t to remaining nommu architectures 2008-02-09 11:08:33 -08:00
asm-x86 Kprobes: indicate kretprobe support in Kconfig 2008-03-04 16:35:11 -08:00
asm-xtensa [XTENSA] Allow debugger to modify the WINDOWBASE register. 2008-02-13 17:45:36 -08:00
crypto
keys
linux md: reduce CPU wastage on idle md array with a write-intent bitmap 2008-03-04 16:35:17 -08:00
math-emu
media V4L/DVB (7192): Adds support for Genius TVGo A11MCE 2008-02-18 11:15:19 -03:00
mtd Merge git://git.infradead.org/~dedekind/ubi-2.6 2008-02-03 22:07:40 +11:00
net [SCTP]: Update AUTH structures to match declarations in draft-16. 2008-02-28 16:45:04 -05:00
pcmcia pcmcia: replace kio_addr_t with unsigned int everywhere 2008-02-05 09:44:08 -08:00
rdma IB/core: Remove unused struct ib_device.flags member 2008-02-08 14:47:26 -08:00
rxrpc
scsi [SCSI] update SG_ALL to avoid causing chaining 2008-02-11 13:40:13 -06:00
sound [ALSA] opl3 - Fix compilation without sequencer support 2008-02-22 14:20:08 -08:00
video atmel_lcdfb: backlight control 2008-02-06 10:41:16 -08:00
xen
Kbuild