x86: Avoid tlbstate lock if not enough cpus

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This one isn't related to previous patch. If online cpus are
below NUM_INVALIDATE_TLB_VECTORS, we don't need the lock. The
comments in the code declares we don't need the check, but a hot
lock still needs an atomic operation and expensive, so add the
check here.

Uses nr_cpu_ids here as suggested by Eric Dumazet.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
LKML-Reference: <1295232730.1949.710.camel@sli10-conroe>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Shaohua Li 2011-01-17 10:52:10 +08:00 • committed by Ingo Molnar

parent 70e4a36973

commit 7064d865af

1 changed files with 4 additions and 7 deletions

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arch/x86/mm/tlb.c

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