Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1282683

Re: [PATCH V2 1/7] trace/events: Add gup trace events

Show all headers | View raw

On Wed,  2 Dec 2015 14:53:27 -0800
Yang Shi <yang.shi@linaro.org> wrote:

> page-faults events record the invoke to handle_mm_fault, but the invoke
> may come from do_page_fault or gup. In some use cases, the finer event count
> mey be needed, so add trace events support for:
> 
> __get_user_pages
> __get_user_pages_fast
> fixup_user_fault
> 
> Signed-off-by: Yang Shi <yang.shi@linaro.org>
> ---
>  include/trace/events/gup.h | 71 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 71 insertions(+)
>  create mode 100644 include/trace/events/gup.h
> 
> diff --git a/include/trace/events/gup.h b/include/trace/events/gup.h
> new file mode 100644
> index 0000000..03a4674
> --- /dev/null
> +++ b/include/trace/events/gup.h
> @@ -0,0 +1,71 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM gup
> +
> +#if !defined(_TRACE_GUP_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_GUP_H
> +
> +#include <linux/types.h>
> +#include <linux/tracepoint.h>
> +
> +TRACE_EVENT(gup_fixup_user_fault,
> +
> +	TP_PROTO(struct task_struct *tsk, struct mm_struct *mm,
> +			unsigned long address, unsigned int fault_flags),
> +
> +	TP_ARGS(tsk, mm, address, fault_flags),

Arges added and not used by TP_fast_assign(), this will slow down the
code while tracing is enabled, as they need to be added to the trace
function call.

> +
> +	TP_STRUCT__entry(
> +		__field(	unsigned long,	address		)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->address	= address;
> +	),
> +
> +	TP_printk("address=%lx",  __entry->address)
> +);
> +
> +TRACE_EVENT(gup_get_user_pages,
> +
> +	TP_PROTO(struct task_struct *tsk, struct mm_struct *mm,
> +			unsigned long start, unsigned long nr_pages),
> +
> +	TP_ARGS(tsk, mm, start, nr_pages),

Here too but this is worse. See below.

> +
> +	TP_STRUCT__entry(
> +		__field(	unsigned long,	start		)
> +		__field(	unsigned long,	nr_pages	)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->start		= start;
> +		__entry->nr_pages	= nr_pages;
> +	),
> +
> +	TP_printk("start=%lx nr_pages=%lu", __entry->start, __entry->nr_pages)
> +);
> +
> +TRACE_EVENT(gup_get_user_pages_fast,
> +
> +	TP_PROTO(unsigned long start, int nr_pages, int write,
> +			struct page **pages),
> +
> +	TP_ARGS(start, nr_pages, write, pages),

This and the above "gup_get_user_pages" have the same entry field,
assign and printk. They should be combined into a DECLARE_EVENT_CLASS()
and two DEFINE_EVENT()s. That will save on size as the
DECLARE_EVENT_CLASS() is the biggest part of each TRACE_EVENT().

-- Steve


> +
> +	TP_STRUCT__entry(
> +		__field(	unsigned long,	start		)
> +		__field(	unsigned long,	nr_pages	)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->start  	= start;
> +		__entry->nr_pages	= nr_pages;
> +	),
> +
> +	TP_printk("start=%lx nr_pages=%lu",  __entry->start, __entry->nr_pages)
> +);
> +
> +#endif /* _TRACE_GUP_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[RFC V2] Add gup trace points support Yang Shi <yang.shi@linaro.org> - 2015-12-03 00:20 +0100
  [PATCH V2 5/7] s390: mm/gup: add gup trace points Yang Shi <yang.shi@linaro.org> - 2015-12-03 00:20 +0100
  [PATCH V2 3/7] x86: mm/gup: add gup trace points Yang Shi <yang.shi@linaro.org> - 2015-12-03 00:20 +0100
  [PATCH V2 4/7] mips: mm/gup: add gup trace points Yang Shi <yang.shi@linaro.org> - 2015-12-03 00:20 +0100
  [PATCH V2 2/7] mm/gup: add gup trace points Yang Shi <yang.shi@linaro.org> - 2015-12-03 00:20 +0100
    Re: [PATCH V2 2/7] mm/gup: add gup trace points Dave Hansen <dave.hansen@intel.com> - 2015-12-03 00:40 +0100
      Re: [PATCH V2 2/7] mm/gup: add gup trace points "Shi, Yang" <yang.shi@linaro.org> - 2015-12-03 01:20 +0100
        Re: [PATCH V2 2/7] mm/gup: add gup trace points "Shi, Yang" <yang.shi@linaro.org> - 2015-12-03 02:00 +0100
      Re: [PATCH V2 2/7] mm/gup: add gup trace points Steven Rostedt <rostedt@goodmis.org> - 2015-12-03 05:20 +0100
        Re: [PATCH V2 2/7] mm/gup: add gup trace points "Shi, Yang" <yang.shi@linaro.org> - 2015-12-03 19:40 +0100
          Re: [PATCH V2 2/7] mm/gup: add gup trace points Steven Rostedt <rostedt@goodmis.org> - 2015-12-03 20:10 +0100
            Re: [PATCH V2 2/7] mm/gup: add gup trace points "Shi, Yang" <yang.shi@linaro.org> - 2015-12-03 23:20 +0100
  [PATCH V2 6/7] sh: mm/gup: add gup trace points Yang Shi <yang.shi@linaro.org> - 2015-12-03 00:20 +0100
  [PATCH V2 1/7] trace/events: Add gup trace events Yang Shi <yang.shi@linaro.org> - 2015-12-03 00:20 +0100
    Re: [PATCH V2 1/7] trace/events: Add gup trace events Steven Rostedt <rostedt@goodmis.org> - 2015-12-03 05:10 +0100
      Re: [PATCH V2 1/7] trace/events: Add gup trace events "Shi, Yang" <yang.shi@linaro.org> - 2015-12-03 19:40 +0100
  [PATCH V2 7/7] sparc64: mm/gup: add gup trace points Yang Shi <yang.shi@linaro.org> - 2015-12-03 00:30 +0100

csiph-web