Messages in this thread Patch in this message | | | From | Waiman Long <> | Subject | [PATCH] x86/mm/fault: Put pgd_lock in its own cacheline | Date | Wed, 10 Jun 2015 09:08:28 -0400 |
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On a large system with many cores, massive creation or destruction of processes/threads can sometime cause a fair amount of spinlock contention in the pgd_lock used by the pgd_alloc() and pgd_free() functions. This patch tries to reduce false cacheline sharing by putting the pgd_lock in its own cacheline which help to reduce contention on the lock.
Signed-off-by: Waiman Long <Waiman.Long@hp.com> --- arch/x86/mm/fault.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 181c53b..fae48df 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -185,7 +185,7 @@ force_sig_info_fault(int si_signo, int si_code, unsigned long address, force_sig_info(si_signo, &info, tsk); } -DEFINE_SPINLOCK(pgd_lock); +__cacheline_aligned_in_smp DEFINE_SPINLOCK(pgd_lock); LIST_HEAD(pgd_list); #ifdef CONFIG_X86_32 -- 1.7.1
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