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    Subject[PATCH 1 of 9] x86: put tlb_flush_others() stats in debugfs
    Date
    From
    Put tlb_flush_others() latency measurements in debugfs.

    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    ---
    arch/x86/kernel/tlb_64.c | 38 ++++++++++++++++++++++++++++++++++++++
    1 file changed, 38 insertions(+)

    diff --git a/arch/x86/kernel/tlb_64.c b/arch/x86/kernel/tlb_64.c
    --- a/arch/x86/kernel/tlb_64.c
    +++ b/arch/x86/kernel/tlb_64.c
    @@ -7,6 +7,7 @@
    #include <linux/kernel_stat.h>
    #include <linux/mc146818rtc.h>
    #include <linux/interrupt.h>
    +#include <linux/debugfs.h>

    #include <asm/mtrr.h>
    #include <asm/pgalloc.h>
    @@ -17,6 +18,8 @@
    #include <asm/idle.h>
    #include <asm/uv/uv_hub.h>
    #include <asm/uv/uv_bau.h>
    +
    +#include <asm/timer.h>

    #include <mach_ipi.h>
    /*
    @@ -157,15 +160,29 @@
    add_pda(irq_tlb_count, 1);
    }

    +#ifdef CONFIG_DEBUG_FS
    +static spinlock_t tlbflush_others_lock = __SPIN_LOCK_UNLOCKED(tlb_flush_others_lock);
    +static u32 tlbflush_others_count;
    +static u64 tlbflush_others_accum;
    +static u8 tlbflush_others_enable;
    +#else
    +#define tlbflush_others_enable 0
    +#endif
    +
    void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
    unsigned long va)
    {
    int sender;
    union smp_flush_state *f;
    cpumask_t cpumask = *cpumaskp;
    + u8 timing_enabled = tlbflush_others_enable;
    + u64 uninitialized_var(start), end;

    if (is_uv_system() && uv_flush_tlb_others(&cpumask, mm, va))
    return;
    +
    + if (timing_enabled)
    + rdtscll(start);

    /* Caller has disabled preemption */
    sender = smp_processor_id() % NUM_INVALIDATE_TLB_VECTORS;
    @@ -194,6 +211,15 @@
    f->flush_mm = NULL;
    f->flush_va = 0;
    spin_unlock(&f->tlbstate_lock);
    +
    + if (timing_enabled) {
    + rdtscll(end);
    +
    + spin_lock(&tlbflush_others_lock);
    + tlbflush_others_count++;
    + tlbflush_others_accum += cycles_2_ns(end - start);
    + spin_unlock(&tlbflush_others_lock);
    + }
    }

    static int __cpuinit init_smp_flush(void)
    @@ -277,3 +303,15 @@
    {
    on_each_cpu(do_flush_tlb_all, NULL, 1);
    }
    +
    +#ifdef CONFIG_DEBUG_FS
    +static int __init init_tlbflush_time(void)
    +{
    + debugfs_create_u8("tlbflush_others_enable", 0644, NULL, &tlbflush_others_enable);
    + debugfs_create_u32("tlbflush_others_count", 0644, NULL, &tlbflush_others_count);
    + debugfs_create_u64("tlbflush_others_accum", 0644, NULL, &tlbflush_others_accum);
    +
    + return 0;
    +}
    +fs_initcall(init_tlbflush_time);
    +#endif



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