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| author | Zhang Yanmin <yanmin.zhang@intel.com> | 2006-06-23 02:04:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-23 07:42:57 -0700 |
| commit | 1b61b910e99059abdd54c93aa70e84e076e33d16 (patch) | |
| tree | fe2cd431dc39521a0f2d30e22c9bd3eb3e1bc317 /include | |
| parent | afa024c3dbccf026e45121f4b9de54cda48edbea (diff) | |
| download | linux-1b61b910e99059abdd54c93aa70e84e076e33d16.tar.bz2 | |
[PATCH] x86: kernel irq balance doesn't work
On i386, kernel irq balance doesn't work.
1) In function do_irq_balance, after kernel finds the min_loaded cpu but
before calling set_pending_irq to really pin the selected_irq to the
target cpu, kernel does a cpus_and with irq_affinity[selected_irq].
Later on, when the irq is acked, kernel would calls
move_native_irq=>desc->handler->set_affinity to change the irq affinity.
However, every function pointed by
hw_interrupt_type->set_affinity(unsigned int irq, cpumask_t cpumask)
always changes irq_affinity[irq] to cpumask. Next time when recalling
do_irq_balance, it has to do cpu_ands again with
irq_affinity[selected_irq], but irq_affinity[selected_irq] already
becomes one cpu selected by the first irq balance.
2) Function balance_irq in file arch/i386/kernel/io_apic.c has the same
issue.
[akpm@osdl.org: cleanups]
Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/irq.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 42c9cd562860..e8a07e75e4fb 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -164,6 +164,14 @@ static inline void set_irq_info(int irq, cpumask_t mask) #endif // CONFIG_SMP +#ifdef CONFIG_IRQBALANCE +extern void set_balance_irq_affinity(unsigned int irq, cpumask_t mask); +#else +static inline void set_balance_irq_affinity(unsigned int irq, cpumask_t mask) +{ +} +#endif + extern int no_irq_affinity; extern int noirqdebug_setup(char *str); |