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Commit 2c099014 authored by David Howells's avatar David Howells
Browse files

afs: Trace the sending of pages 



Add a pair of tracepoints to log the sending of pages for an FS.StoreData
or FS.StoreData64 operation.

Tracepoint afs_send_pages notes each set of pages added to the operation.
There may be several of these per operation as we get up at most 8
contiguous pages in one go because the bvec we're using is on the stack.

Tracepoint afs_sent_pages notes the end of adding data from a whole run of
pages to the operation and the completion of the request phase.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent 025db80c

fs/afs/rxrpc.c

+3 −0
Original line number Diff line number Diff line
@@ -303,6 +303,8 @@ static int afs_send_pages(struct afs_call *call, struct msghdr *msg) 


	do {

		afs_load_bvec(call, msg, bv, first, last, offset);

		trace_afs_send_pages(call, msg, first, last, offset);



		offset = 0;

		bytes = msg->msg_iter.count;

		nr = msg->msg_iter.nr_segs;
@@ -317,6 +319,7 @@ static int afs_send_pages(struct afs_call *call, struct msghdr *msg) 
		first += nr;

	} while (first <= last);



	trace_afs_sent_pages(call, call->first, last, first, ret);

	return ret;

}

include/trace/events/afs.h

+61 −0
Original line number Diff line number Diff line
@@ -320,6 +320,67 @@ TRACE_EVENT(afs_call_done, 
		      __entry->rx_call)

	    );



TRACE_EVENT(afs_send_pages,

	    TP_PROTO(struct afs_call *call, struct msghdr *msg,

		     pgoff_t first, pgoff_t last, unsigned int offset),



	    TP_ARGS(call, msg, first, last, offset),



	    TP_STRUCT__entry(

		    __field(struct afs_call *,		call		)

		    __field(pgoff_t,			first		)

		    __field(pgoff_t,			last		)

		    __field(unsigned int,		nr		)

		    __field(unsigned int,		bytes		)

		    __field(unsigned int,		offset		)

		    __field(unsigned int,		flags		)

			     ),



	    TP_fast_assign(

		    __entry->call = call;

		    __entry->first = first;

		    __entry->last = last;

		    __entry->nr = msg->msg_iter.nr_segs;

		    __entry->bytes = msg->msg_iter.count;

		    __entry->offset = offset;

		    __entry->flags = msg->msg_flags;

			   ),



	    TP_printk(" c=%p %lx-%lx-%lx b=%x o=%x f=%x",

		      __entry->call,

		      __entry->first, __entry->first + __entry->nr - 1, __entry->last,

		      __entry->bytes, __entry->offset,

		      __entry->flags)

	    );



TRACE_EVENT(afs_sent_pages,

	    TP_PROTO(struct afs_call *call, pgoff_t first, pgoff_t last,

		     pgoff_t cursor, int ret),



	    TP_ARGS(call, first, last, cursor, ret),



	    TP_STRUCT__entry(

		    __field(struct afs_call *,		call		)

		    __field(pgoff_t,			first		)

		    __field(pgoff_t,			last		)

		    __field(pgoff_t,			cursor		)

		    __field(int,			ret		)

			     ),



	    TP_fast_assign(

		    __entry->call = call;

		    __entry->first = first;

		    __entry->last = last;

		    __entry->cursor = cursor;

		    __entry->ret = ret;

			   ),



	    TP_printk(" c=%p %lx-%lx c=%lx r=%d",

		      __entry->call,

		      __entry->first, __entry->last,

		      __entry->cursor, __entry->ret)

	    );



#endif /* _TRACE_AFS_H */



/* This part must be outside protection */