kernel-ark/include
Jens Axboe bc1c116974 [PATCH] elevator switching race
There's a race between shutting down one io scheduler and firing up the
next, in which a new io could enter and cause the io scheduler to be
invoked with bad or NULL data.

To fix this, we need to maintain the queue lock for a bit longer.
Unfortunately we cannot do that, since the elevator init requires to be
run without the lock held.  This isn't easily fixable, without also
changing the mempool API.  So split the initialization into two parts,
and alloc-init operation and an attach operation.  Then we can
preallocate the io scheduler and related structures, and run the attach
inside the lock after we detach the old one.

This patch has survived 30 minutes of 1 second io scheduler switching
with a very busy io load.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-08 15:14:23 -07:00
..
acpi
asm-alpha [PATCH] alpha: SMP IRQ routing fix 2006-06-05 12:29:16 -07:00
asm-arm [SERIAL] typo: buad -> baud 2006-06-05 10:45:30 +01:00
asm-arm26
asm-cris
asm-frv
asm-generic [SPARC64]: Fix D-cache corruption in mremap 2006-06-01 17:47:25 -07:00
asm-h8300
asm-i386
asm-ia64
asm-m32r
asm-m68k
asm-m68knommu
asm-mips [MIPS] Fix sparsemem support. 2006-06-06 00:15:20 +01:00
asm-parisc
asm-powerpc [PATCH] Add CMSPAR to termbits.h for powerpc and alpha 2006-05-26 11:55:46 -07:00
asm-ppc
asm-s390 [PATCH] s390: cio non-unique path group ids 2006-06-05 12:29:16 -07:00
asm-sh
asm-sh64
asm-sparc [SPARC]: Add robust futex syscall entries. 2006-05-21 21:22:53 -07:00
asm-sparc64 [SPARC64]: Fix D-cache corruption in mremap 2006-06-01 17:47:25 -07:00
asm-um [PATCH] uml: more __user annotations 2006-06-05 12:29:17 -07:00
asm-v850
asm-x86_64 [PATCH] x86_64: Fix stack/mmap randomization for compat tasks 2006-05-30 20:31:05 -07:00
asm-xtensa
keys
linux [PATCH] elevator switching race 2006-06-08 15:14:23 -07:00
math-emu
media
mtd
net [PATCH] net/compat.h build fix 2006-05-31 16:27:11 -07:00
pcmcia
rdma
rxrpc
scsi
sound
video