tree 93d08badf3a18e6bcdf2baf97532a8f54fec5a08
parent 814ce2521121c2459e16cea8c7221e157edbeddd
author Eric Dumazet <eric.dumazet@gmail.com> 1288865628 +0100
committer Thomas Gleixner <tglx@linutronix.de> 1289380882 +0100

irq: Better struct irqaction layout

We currently use kmalloc-96 slab for struct irqaction allocations on
64bit arches.

This is unfortunate because of possible false sharing and two cache
lines accesses.

Move 'name' and 'dir' fields at the end of the structure, and force a
suitable alignement.

Hot path fields now use one cache line on x86_64.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Reviewed-by: Andi Kleen <andi@firstfloor.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <1288865628.2659.69.camel@edumazet-laptop>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>