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| author | Mike Travis <travis@sgi.com> | 2009-01-10 22:24:07 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-11 19:13:42 +0100 |
| commit | 542d865bbed4ce1f050f586e53cf1cfadda93766 (patch) | |
| tree | 73ed6c9ef7cf7defbcc50a210aafbf1d7d914f7a /kernel/irq | |
| parent | 9332fccdedf8e09448f3b69b624211ae879f6c45 (diff) | |
| download | linux-542d865bbed4ce1f050f586e53cf1cfadda93766.tar.gz linux-542d865bbed4ce1f050f586e53cf1cfadda93766.tar.bz2 linux-542d865bbed4ce1f050f586e53cf1cfadda93766.zip | |
kstat: modify kstat_irqs_legacy to be variable sized
Impact: reduce memory usage.
Allocate kstat_irqs_legacy based on nr_cpu_ids to deal with this
memory usage bump when NR_CPUS bumped from 128 to 4096:
8192 +253952 262144 +3100% kstat_irqs_legacy(.bss)
This is only when CONFIG_SPARSE_IRQS=y.
Signed-off-by: Mike Travis <travis@sgi.com>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/handle.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index ebba7a116f14..b39f32ac8f80 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -124,8 +124,7 @@ static struct irq_desc irq_desc_legacy[NR_IRQS_LEGACY] __cacheline_aligned_in_sm } }; -/* FIXME: use bootmem alloc ...*/ -static unsigned int kstat_irqs_legacy[NR_IRQS_LEGACY][NR_CPUS]; +static unsigned int *kstat_irqs_legacy; int __init early_irq_init(void) { @@ -144,9 +143,14 @@ int __init early_irq_init(void) /* allocate irq_desc_ptrs array based on nr_irqs */ irq_desc_ptrs = alloc_bootmem(nr_irqs * sizeof(void *)); + /* allocate based on nr_cpu_ids */ + /* FIXME: invert kstat_irgs, and it'd be a per_cpu_alloc'd thing */ + kstat_irqs_legacy = alloc_bootmem(NR_IRQS_LEGACY * nr_cpu_ids * + sizeof(int)); + for (i = 0; i < legacy_count; i++) { desc[i].irq = i; - desc[i].kstat_irqs = kstat_irqs_legacy[i]; + desc[i].kstat_irqs = kstat_irqs_legacy + i * nr_cpu_ids; lockdep_set_class(&desc[i].lock, &irq_desc_lock_class); init_alloc_desc_masks(&desc[i], 0, true); irq_desc_ptrs[i] = desc + i; |