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SubjectRe: [PATCH v9 10/10] tracing/hyper-v: trace hyperv_mmu_flush_tlb_others()
On Fri, 14 Jul 2017 14:44:42 +0200
Vitaly Kuznetsov <vkuznets@redhat.com> wrote:

> Add Hyper-V tracing subsystem and trace hyperv_mmu_flush_tlb_others().
> Tracing is done the same way we do xen_mmu_flush_tlb_others().
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Reviewed-by: Stephen Hemminger <sthemmin@microsoft.com>

Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

(comment below)

> ---
> MAINTAINERS | 1 +
> arch/x86/hyperv/mmu.c | 7 +++++++
> arch/x86/include/asm/trace/hyperv.h | 40 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 48 insertions(+)
> create mode 100644 arch/x86/include/asm/trace/hyperv.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index d8eab9322ba2..4a491f3b8cfd 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -6276,6 +6276,7 @@ M: Stephen Hemminger <sthemmin@microsoft.com>
> L: devel@linuxdriverproject.org
> S: Maintained
> F: arch/x86/include/asm/mshyperv.h
> +F: arch/x86/include/asm/trace/hyperv.h
> F: arch/x86/include/uapi/asm/hyperv.h
> F: arch/x86/kernel/cpu/mshyperv.c
> F: arch/x86/hyperv
> diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c
> index 6fb84c4c3ee7..41bff87fb055 100644
> --- a/arch/x86/hyperv/mmu.c
> +++ b/arch/x86/hyperv/mmu.c
> @@ -8,6 +8,9 @@
> #include <asm/msr.h>
> #include <asm/tlbflush.h>
>
> +#define CREATE_TRACE_POINTS
> +#include <asm/trace/hyperv.h>
> +
> /* HvFlushVirtualAddressSpace, HvFlushVirtualAddressList hypercalls */
> struct hv_flush_pcpu {
> u64 address_space;
> @@ -101,6 +104,8 @@ static void hyperv_flush_tlb_others(const struct cpumask *cpus,
> u64 status = U64_MAX;
> unsigned long flags;
>
> + trace_hyperv_mmu_flush_tlb_others(cpus, info);
> +
> if (!pcpu_flush || !hv_hypercall_pg)
> goto do_native;
>
> @@ -170,6 +175,8 @@ static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
> u64 status = U64_MAX;
> unsigned long flags;
>
> + trace_hyperv_mmu_flush_tlb_others(cpus, info);
> +
> if (!pcpu_flush_ex || !hv_hypercall_pg)
> goto do_native;
>
> diff --git a/arch/x86/include/asm/trace/hyperv.h b/arch/x86/include/asm/trace/hyperv.h
> new file mode 100644
> index 000000000000..4253bca99989
> --- /dev/null
> +++ b/arch/x86/include/asm/trace/hyperv.h
> @@ -0,0 +1,40 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM hyperv
> +
> +#if !defined(_TRACE_HYPERV_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_HYPERV_H
> +
> +#include <linux/tracepoint.h>
> +
> +#if IS_ENABLED(CONFIG_HYPERV)
> +
> +TRACE_EVENT(hyperv_mmu_flush_tlb_others,
> + TP_PROTO(const struct cpumask *cpus,
> + const struct flush_tlb_info *info),
> + TP_ARGS(cpus, info),
> + TP_STRUCT__entry(
> + __field(unsigned int, ncpus)
> + __field(struct mm_struct *, mm)
> + __field(unsigned long, addr)
> + __field(unsigned long, end)
> + ),
> + TP_fast_assign(__entry->ncpus = cpumask_weight(cpus);
> + __entry->mm = info->mm;
> + __entry->addr = info->start;
> + __entry->end = info->end;
> + ),
> + TP_printk("ncpus %d mm %p addr %lx, end %lx",
> + __entry->ncpus, __entry->mm,
> + __entry->addr, __entry->end)
> + );
> +
> +#endif /* CONFIG_HYPERV */
> +
> +#undef TRACE_INCLUDE_PATH
> +#define TRACE_INCLUDE_PATH asm/trace/

Sometimes adding the include path in the make file may be easier. But
this is fine too.

-- Steve

> +#undef TRACE_INCLUDE_FILE
> +#define TRACE_INCLUDE_FILE hyperv
> +#endif /* _TRACE_HYPERV_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>

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