4369ef3c3e
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> |
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| acorn | ||
| acpi | ||
| amba | ||
| atm | ||
| base | ||
| block | ||
| bluetooth | ||
| cdrom | ||
| char | ||
| connector | ||
| cpufreq | ||
| crypto | ||
| dio | ||
| eisa | ||
| fc4 | ||
| firmware | ||
| hwmon | ||
| i2c | ||
| ide | ||
| ieee1394 | ||
| infiniband | ||
| input | ||
| isdn | ||
| macintosh | ||
| mca | ||
| md | ||
| media | ||
| message | ||
| mfd | ||
| misc | ||
| mmc | ||
| mtd | ||
| net | ||
| nubus | ||
| oprofile | ||
| parisc | ||
| parport | ||
| pci | ||
| pcmcia | ||
| pnp | ||
| rapidio | ||
| s390 | ||
| sbus | ||
| scsi | ||
| serial | ||
| sh | ||
| sn | ||
| tc | ||
| telephony | ||
| usb | ||
| video | ||
| w1 | ||
| zorro | ||
| Kconfig | ||
| Makefile | ||