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cb98fc8bb9
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Tejun Heo cb98fc8bb9 [BLOCK] Reimplement elevator switch 
This patch reimplements elevator switch.  This patch assumes generic
dispatch queue patchset is applied.

 * Each request is tagged with REQ_ELVPRIV flag if it has its elevator
   private data set.
 * Requests which doesn't have REQ_ELVPRIV flag set never enter
   iosched.  They are always directly back inserted to dispatch queue.
   Of course, elevator_put_req_fn is called only for requests which
   have its REQ_ELVPRIV set.
 * Request queue maintains the current number of requests which have
   its elevator data set (elevator_set_req_fn called) in
   q->rq->elvpriv.
 * If a request queue has QUEUE_FLAG_BYPASS set, elevator private data
   is not allocated for new requests.

 To switch to another iosched, we set QUEUE_FLAG_BYPASS and wait until
elvpriv goes to zero; then, we attach the new iosched and clears
QUEUE_FLAG_BYPASS.  New implementation is much simpler and main code
paths are less cluttered, IMHO.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
2005-10-28 08:48:12 +02:00
..
acpi
asm-alpha [PATCH] alpha: atomic dependency fix 2005-10-25 09:32:46 -07:00
asm-arm [ARM] 3032/1: sparse: complains about generic_fls() prototype in asm-arm/bitops.h 2005-10-26 15:04:21 +01:00
asm-arm26 [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-cris [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-frv [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-generic [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
asm-h8300 [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-i386 [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
asm-ia64 [PATCH] ia64 basic __user annotations 2005-09-29 08:46:27 -07:00
asm-m32r [PATCH] m32r: more basic __user annotations 2005-09-26 18:29:50 -07:00
asm-m68k [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-m68knommu [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-mips [PATCH] mm: move_pte to remap ZERO_PAGE 2005-09-28 07:46:40 -07:00
asm-parisc [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-powerpc [PATCH] ppc32: Fix timekeeping 2005-10-12 08:24:47 -07:00
asm-ppc [PATCH] ppc32: Tell userland about lack of standard TB 2005-10-12 08:24:47 -07:00
asm-ppc64 [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
asm-s390 [PATCH] s390 signal annotations 2005-09-29 08:46:27 -07:00
asm-sh [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-sh64 [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-sparc [PATCH] fix the breakage in sparc headers 2005-10-05 07:33:42 -07:00
asm-sparc64 [SPARC64]: Eliminate PCI IOMMU dma mapping size limit. 2005-10-13 22:15:24 -07:00
asm-um [PATCH] uml: Fix sysrq-r support for skas mode 2005-10-04 13:22:01 -07:00
asm-v850 [PATCH] Remove unused var from asm/futex.h 2005-09-21 16:16:29 -07:00
asm-x86_64 Revert "x86-64: Avoid unnecessary double bouncing for swiotlb" 2005-10-27 16:28:39 -07:00
asm-xtensa [PATCH] xtensa: remove io_remap_page_range and minor clean-ups 2005-09-22 22:17:37 -07:00
linux [BLOCK] Reimplement elevator switch 2005-10-28 08:48:12 +02:00
math-emu
media
mtd
net [LLC]: Strip RIF flag from source MAC address 2005-10-25 21:34:39 -02:00
pcmcia [PATCH] yenta: auto-tune EnE bridges for CardBus cards 2005-09-26 13:09:20 +02:00
rdma [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
rxrpc [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
scsi [SCSI] allow REPORT LUN scanning even for LUN 0 PQ of 3 2005-09-25 12:01:48 -05:00
sound [PATCH] gfp flags annotations - part 1 2005-10-08 15:00:57 -07:00
video [PATCH] drivers/video: Replace custom macro with isdigit() 2005-09-13 08:22:33 -07:00