Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single()
From: Jeremy Fitzhardinge
Date: Sun Mar 16 2008 - 19:01:38 EST
Jens Axboe wrote:
On Fri, Mar 14 2008, Jeremy Fitzhardinge wrote:
Jens Axboe wrote:
rom: Nick Piggin <npiggin@xxxxxxx>
Why is this necessary? How is smp_call_function_single slow?
Because it's completely serialized by the call_lock spinlock.
Hm, yes. Would it be possible to implement smp_call_function_mask in a
generic way to avoid that? Turn the static structure into a per-cpu
request list?
J
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