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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: David Howells <dhowells@redhat.com>
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2 changed files with 64 additions and 0 deletions
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@ -303,6 +303,8 @@ static int afs_send_pages(struct afs_call *call, struct msghdr *msg)
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do {
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afs_load_bvec(call, msg, bv, first, last, offset);
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trace_afs_send_pages(call, msg, first, last, offset);
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offset = 0;
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bytes = msg->msg_iter.count;
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nr = msg->msg_iter.nr_segs;
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@ -317,6 +319,7 @@ static int afs_send_pages(struct afs_call *call, struct msghdr *msg)
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first += nr;
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} while (first <= last);
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trace_afs_sent_pages(call, call->first, last, first, ret);
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return ret;
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}
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@ -320,6 +320,67 @@ TRACE_EVENT(afs_call_done,
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__entry->rx_call)
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);
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TRACE_EVENT(afs_send_pages,
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TP_PROTO(struct afs_call *call, struct msghdr *msg,
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pgoff_t first, pgoff_t last, unsigned int offset),
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TP_ARGS(call, msg, first, last, offset),
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TP_STRUCT__entry(
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__field(struct afs_call *, call )
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__field(pgoff_t, first )
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__field(pgoff_t, last )
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__field(unsigned int, nr )
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__field(unsigned int, bytes )
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__field(unsigned int, offset )
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__field(unsigned int, flags )
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),
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TP_fast_assign(
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__entry->call = call;
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__entry->first = first;
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__entry->last = last;
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__entry->nr = msg->msg_iter.nr_segs;
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__entry->bytes = msg->msg_iter.count;
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__entry->offset = offset;
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__entry->flags = msg->msg_flags;
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),
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TP_printk(" c=%p %lx-%lx-%lx b=%x o=%x f=%x",
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__entry->call,
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__entry->first, __entry->first + __entry->nr - 1, __entry->last,
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__entry->bytes, __entry->offset,
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__entry->flags)
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);
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TRACE_EVENT(afs_sent_pages,
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TP_PROTO(struct afs_call *call, pgoff_t first, pgoff_t last,
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pgoff_t cursor, int ret),
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TP_ARGS(call, first, last, cursor, ret),
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TP_STRUCT__entry(
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__field(struct afs_call *, call )
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__field(pgoff_t, first )
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__field(pgoff_t, last )
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__field(pgoff_t, cursor )
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__field(int, ret )
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),
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TP_fast_assign(
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__entry->call = call;
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__entry->first = first;
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__entry->last = last;
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__entry->cursor = cursor;
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__entry->ret = ret;
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),
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TP_printk(" c=%p %lx-%lx c=%lx r=%d",
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__entry->call,
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__entry->first, __entry->last,
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__entry->cursor, __entry->ret)
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);
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#endif /* _TRACE_AFS_H */
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/* This part must be outside protection */
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