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    mm: vmstats: track TLB flush stats on UP too · 6df46865
    Dave Hansen 提交于
    The previous patch doing vmstats for TLB flushes ("mm: vmstats: tlb flush
    counters") effectively missed UP since arch/x86/mm/tlb.c is only compiled
    for SMP.
    
    UP systems do not do remote TLB flushes, so compile those counters out on
    UP.
    
    arch/x86/kernel/cpu/mtrr/generic.c calls __flush_tlb() directly.  This is
    probably an optimization since both the mtrr code and __flush_tlb() write
    cr4.  It would probably be safe to make that a flush_tlb_all() (and then
    get these statistics), but the mtrr code is ancient and I'm hesitant to
    touch it other than to just stick in the counters.
    
    [akpm@linux-foundation.org: tweak comments]
    Signed-off-by: NDave Hansen <dave.hansen@linux.intel.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    6df46865
generic.c 20.9 KB