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4369ef3c3e
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Paul E. McKenney 4369ef3c3e [PATCH] Make RCU task_struct safe for oprofile 
Applying RCU to the task structure broke oprofile, because
free_task_notify() can now be called from softirq.  This means that the
task_mortuary lock must be acquired with irq disabled in order to avoid
intermittent self-deadlock.  Since irq is now disabled, the critical
section within process_task_mortuary() has been restructured to be O(1) in
order to maximize scalability and minimize realtime latency degradation.

Kudos to Wu Fengguang for finding this problem!

CC: Wu Fengguang <wfg@mail.ustc.edu.cn>
Cc: Philippe Elie <phil.el@wanadoo.fr>
Cc: John Levon <levon@movementarian.org>
Signed-off-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-08 20:13:40 -08:00
..
acorn [PATCH] I2C: Remove .owner setting from i2c_driver as it's no longer needed 2006-01-05 22:16:25 -08:00
acpi [ACPI] remove Kconfig "default y" for laptop drivers 2006-01-07 05:11:08 -05:00
amba [ARM] Move AMBA bus code to drivers/amba/ 2006-01-07 14:54:15 +00:00
atm [PATCH] frv: fix uninitialised variable in atm nicstar driver 2006-01-08 20:13:38 -08:00
base [PATCH] memhotplug: register_memory should be global 2006-01-06 08:33:22 -08:00
block Merge branch 'post-2.6.15' of git://brick.kernel.dk/data/git/linux-2.6-block 2006-01-06 09:01:25 -08:00
bluetooth [PATCH] pcmcia: add some IDs for ide-cs and dtl1_cs 2006-01-06 00:31:07 +01:00
cdrom [BLOCK] add @uptodate to end_that_request_last() and @error to rq_end_io_fn() 2006-01-06 09:49:03 +01:00
char [PATCH] frv: suppress configuration of certain features for FRV 2006-01-08 20:13:36 -08:00
connector [PATCH] Add timestamp field to process events 2005-12-12 08:57:42 -08:00
cpufreq [CPUFREQ] CPU frequency display in /proc/cpuinfo 2005-12-06 19:35:11 -08:00
crypto
dio
eisa
fc4 [SPARC]: introduce a SPARC Kconfig symbol 2005-12-22 23:09:54 -08:00
firmware [PATCH] dell_rbu: NULL noise removal 2005-12-15 10:04:30 -08:00
hwmon [PATCH] hwmon: it87 use u8 for vrm 2006-01-05 22:16:26 -08:00
i2c [ARM] Move asm/hardware/clock.h to linux/clk.h 2006-01-07 16:15:52 +00:00
ide [PATCH] frv: fix uninitialised variable in serverworks driver 2006-01-08 20:13:38 -08:00
ieee1394 [PATCH] don't freeze firewire on suspend. 2006-01-06 08:33:43 -08:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6 2006-01-04 18:44:12 -08:00
input [PATCH] small hp_sdc_rtc cleanup: use no_llseek 2006-01-08 20:12:38 -08:00
isdn [PATCH] frv: suppress configuration of certain features for FRV 2006-01-08 20:13:36 -08:00
macintosh Merge ../torvalds-2.6/ 2006-01-06 12:59:59 -08:00
mca
md [PATCH] md: allow sync-speed to be controlled per-device 2006-01-06 08:34:10 -08:00
media Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/i2c-2.6 2006-01-06 15:25:08 -08:00
message Merge branch 'post-2.6.15' of git://brick.kernel.dk/data/git/linux-2.6-block 2006-01-06 09:01:25 -08:00
mfd [PATCH] input: fix ucb1x00-ts breakage after conversion to dynamic input_dev allocation 2005-12-12 08:57:45 -08:00
misc Input: ibmasm - convert to dynamic input_dev allocation 2006-01-07 11:35:05 -05:00
mmc Merge master.kernel.org:/home/rmk/linux-2.6-arm 2006-01-07 10:45:22 -08:00
mtd [ARM] Move asm/hardware/clock.h to linux/clk.h 2006-01-07 16:15:52 +00:00
net [PATCH] cs89x0: fix up after pnx0105 Kconfig symbol renaming 2006-01-08 20:12:46 -08:00
nubus
oprofile [PATCH] Make RCU task_struct safe for oprofile 2006-01-08 20:13:40 -08:00
parisc [PARISC] Make superio.c initialize before any driver needs it 2005-11-17 16:44:57 -05:00
parport [PATCH] frv: suppress configuration of certain features for FRV 2006-01-08 20:13:36 -08:00
pci Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6 2006-01-04 18:44:12 -08:00
pcmcia Merge with Linus' kernel. 2006-01-07 14:40:05 +00:00
pnp [PATCH] x86: Fixed pnp bios limits 2006-01-06 08:33:35 -08:00
rapidio
s390 Merge branch 'post-2.6.15' of git://brick.kernel.dk/data/git/linux-2.6-block 2006-01-06 09:01:25 -08:00
sbus [PATCH] sbus/char/uctrl: missing prototypes and NULL noise removal 2005-12-15 10:01:28 -08:00
scsi Merge branch 'post-2.6.15' of git://brick.kernel.dk/data/git/linux-2.6-block 2006-01-06 09:01:25 -08:00
serial Merge master.kernel.org:/home/rmk/linux-2.6-arm 2006-01-07 10:45:22 -08:00
sh
sn
tc [MIPS] zs.c: Resurrect the deceased zs.c for now. 2005-11-17 16:23:39 +00:00
telephony [PATCH] pcmcia: unify attach, EVENT_CARD_INSERTION handlers into one probe callback 2006-01-06 00:03:24 +01:00
usb Merge git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2006-01-07 11:29:51 -08:00
video [PATCH] frv: suppress configuration of certain features for FRV 2006-01-08 20:13:36 -08:00
w1 Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6 2006-01-04 18:44:12 -08:00
zorro
Kconfig
Makefile [ARM] Move AMBA bus code to drivers/amba/ 2006-01-07 14:54:15 +00:00