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sparse irq_desc[] array: core kernel and x86 changes

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Impact: new feature

Problem on distro kernels: irq_desc[NR_IRQS] takes megabytes of RAM with
NR_CPUS set to large values. The goal is to be able to scale up to much
larger NR_IRQS value without impacting the (important) common case.

To solve this, we generalize irq_desc[NR_IRQS] to an (optional) array of
irq_desc pointers.

When CONFIG_SPARSE_IRQ=y is used, we use kzalloc_node to get irq_desc,
this also makes the IRQ descriptors NUMA-local (to the site that calls
request_irq()).

This gets rid of the irq_cfg[] static array on x86 as well: irq_cfg now
uses desc->chip_data for x86 to store irq_cfg.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu
2008-12-05 18:58:31 -08:00
committed by Ingo Molnar
parent 218d11a8b0
commit 0b8f1efad3
23 changed files with 659 additions and 173 deletions
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22
drivers/char/random.c
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@@ -558,23 +558,9 @@ struct timer_rand_state {
unsigned dont_count_entropy:1;
};
static struct timer_rand_state *irq_timer_state[NR_IRQS];
static struct timer_rand_state *get_timer_rand_state(unsigned int irq)
{
if (irq >= nr_irqs)
return NULL;
return irq_timer_state[irq];
}
static void set_timer_rand_state(unsigned int irq, struct timer_rand_state *state)
{
if (irq >= nr_irqs)
return;
irq_timer_state[irq] = state;
}
#ifndef CONFIG_SPARSE_IRQ
struct timer_rand_state *irq_timer_state[NR_IRQS];
#endif
static struct timer_rand_state input_timer_state;
@@ -933,8 +919,10 @@ void rand_initialize_irq(int irq)
{
struct timer_rand_state *state;
#ifndef CONFIG_SPARSE_IRQ
if (irq >= nr_irqs)
return;
#endif
state = get_timer_rand_state(irq);