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(parent: e2f4d06) | patch
irq: allocate irq_desc_ptrs array based on nr_irqs
authorMike Travis <travis@sgi.com>
Sun, 11 Jan 2009 06:24:06 +0000 (22:24 -0800)
committerIngo Molnar <mingo@elte.hu>
Sun, 11 Jan 2009 18:13:35 +0000 (19:13 +0100)
commit0fa0ebbf15addc1be8f73325d809c8547a9de304
treecd995419a3eb84d3e18e92ff205af86a7a4ed66dtree | snapshot
parente2f4d06545ec1f29b0e838ee34cbf3500ea5b9a4commit | diff
irq: allocate irq_desc_ptrs array based on nr_irqs

Impact: allocate irq_desc_ptrs in preparation for making it variable-sized.

This addresses this memory usage bump when NR_CPUS bumped from 128 to 4096:

    34816   +229376    264192  +658%  irq_desc_ptrs(.data.read_mostly)

The patch is split into two parts, the first simply allocates the
irq_desc_ptrs array.  Then next will deal with making it variable.
This is only when CONFIG_SPARSE_IRQS=y.

Signed-off-by: Mike Travis <travis@sgi.com>
kernel/irq/handle.c diff | blob | history
kernel/irq/internals.h diff | blob | history
Domain: System / Uncategorized;