On Tue, 2013-01-29 at 15:25 +0800, chenggang wrote:
> ---
> include/trace/events/vfs.h | 110
> ++++++++++++++++++++++++++++++++++++++++++++
> mm/filemap.c | 18 ++++++++
> 2 files changed, 128 insertions(+)
> create mode 100644 include/trace/events/vfs.h
>
> diff --git a/include/trace/events/vfs.h b/include/trace/events/vfs.h
> new file mode 100644
> index 0000000..33498e1
> --- /dev/null
> +++ b/include/trace/events/vfs.h
> @@ -0,0 +1,110 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM vfs
> +#define TRACE_INCLUDE_FILE vfs
> +
> +#if !defined(_TRACE_EVENTS_VFS_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_EVENTS_VFS_H
> +
> +#include <linux/tracepoint.h>
> +
> +#include <asm/ptrace.h>
> +
> +TRACE_EVENT(generic_file_aio_read,
> +
> + TP_PROTO(long long pos, unsigned long bytes, unsigned char *fname),
> +
> + TP_ARGS(pos, bytes, fname),
> +
> + TP_STRUCT__entry(
> + __field( long long, pos )
> + __field( unsigned long, bytes )
> + __array( unsigned char, fname, 100 )
100 bytes is a big waste of space in the ring buffer. Please use dynamic
string, unless fname is always a 100 bytes in length:
__string( fname, fname )
> + ),
> +
> + TP_fast_assign(
> + __entry->pos = pos;
> + __entry->bytes = bytes;
> + strncpy(__entry->fname, fname, 100);
Then here add:
__assign_str(fname, fname);
> + ),
> +
> + TP_printk("aio read(Filename: %s Pos: %lld Bytes: %lu)",
> + __entry->fname, __entry->pos, __entry->bytes)
> +);
> +
> +TRACE_EVENT_FLAGS(generic_file_aio_read, TRACE_EVENT_FL_CAP_ANY)
> +
> +TRACE_EVENT(generic_file_aio_write,
> +
> + TP_PROTO(long long pos, unsigned long bytes, unsigned char *fname),
> +
> + TP_ARGS(pos, bytes, fname),
> +
> + TP_STRUCT__entry(
> + __field( long long, pos )
> + __field( unsigned long, bytes )
> + __array( unsigned char, fname, 100 )
> + ),
> +
> + TP_fast_assign(
> + __entry->pos = pos;
> + __entry->bytes = bytes;
> + strncpy(__entry->fname, fname, 100);
> + ),
> +
> + TP_printk("aio write(Filename: %s Pos: %lld Bytes: %lu)",
> + __entry->fname, __entry->pos, __entry->bytes)
> +);
> +
> +TRACE_EVENT_FLAGS(generic_file_aio_write, TRACE_EVENT_FL_CAP_ANY)
> +
> +TRACE_EVENT(direct_io_read,
> + TP_PROTO(long long pos, unsigned long bytes, unsigned char *fname),
> +
> + TP_ARGS(pos, bytes, fname),
> +
> + TP_STRUCT__entry(
> + __field( long long, pos )
> + __field( unsigned long, bytes )
> + __array( unsigned char, fname, 100 )
> + ),
> +
> + TP_fast_assign(
> + __entry->pos = pos;
> + __entry->bytes = bytes;
> + strncpy(__entry->fname, fname, 100);
> + ),
> +
> + TP_printk("direct io read(Filename: %s Pos: %lld Bytes: %lu)",
> + __entry->fname, __entry->pos, __entry->bytes)
> +);
> +
> +TRACE_EVENT_FLAGS(direct_io_read, TRACE_EVENT_FL_CAP_ANY)
> +
> +TRACE_EVENT(direct_io_write,
> + TP_PROTO(long long pos, unsigned long bytes, unsigned char *fname),
> +
> + TP_ARGS(pos, bytes, fname),
> +
> + TP_STRUCT__entry(
> + __field( long long, pos )
> + __field( unsigned long, bytes )
> + __array( unsigned char, fname, 100 )
> + ),
> +
> + TP_fast_assign(
> + __entry->pos = pos;
> + __entry->bytes = bytes;
> + strncpy(__entry->fname, fname, 100);
> + ),
> +
> + TP_printk("direct io write(Filename: %s Pos: %lld Bytes: %lu)",
> + __entry->fname, __entry->pos, __entry->bytes)
All of these are identical, except that you repeat the tracepoint name
in the TP_printk format, which in unnecessary, as the tracepoint name is
always printed in the trace. Please create a single
DECLACE_EVENT_CLASS() and create 4 DEFINE_EVENTS(). Every TRACE_EVENT
costs about 5k in code. A DECLARE_EVENT_CLASS() costs about 4.5k, and
each DEFINE_EVENT costs about 250 bytes.
-- Steve
> +);
> +
> +TRACE_EVENT_FLAGS(direct_io_write, TRACE_EVENT_FL_CAP_ANY)
> +
> +#endif /* _TRACE_EVENTS_SYSCALLS_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
> +
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 83efee7..0310e7b 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -42,6 +42,9 @@
>
> #include <asm/mman.h>
>
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/vfs.h>
> +
> /*
--
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