Messages in this thread Patch in this message | | | Date | Tue, 25 Nov 2008 09:12:31 +0100 | From | Markus Metzger <> | Subject | [patch 8/9] x86, ftrace: call trace->open() before stopping tracing; add trace->print_header() |
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Add a callback to allow an ftrace plug-in to write its own header.
Move the call to trace->open() up a few lines.
The changes are required by the BTS ftrace plug-in.
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> ---
Index: ftrace/kernel/trace/trace.c =================================================================== --- ftrace.orig/kernel/trace/trace.c 2008-11-24 13:46:26.000000000 +0100 +++ ftrace/kernel/trace/trace.c 2008-11-25 08:18:05.000000000 +0100 @@ -2298,7 +2298,9 @@ seq_printf(m, "# tracer: %s\n", iter->trace->name); seq_puts(m, "#\n"); } - if (iter->iter_flags & TRACE_FILE_LAT_FMT) { + if (iter->trace && iter->trace->print_header) + iter->trace->print_header(m); + else if (iter->iter_flags & TRACE_FILE_LAT_FMT) { /* print nothing if the buffers are empty */ if (trace_empty(iter)) return 0; @@ -2350,6 +2352,10 @@ iter->trace = current_trace; iter->pos = -1; + /* Notify the tracer early; before we stop tracing. */ + if (iter->trace && iter->trace->open) + iter->trace->open(iter); + /* Annotate start of buffers if we had overruns */ if (ring_buffer_overruns(iter->tr->buffer)) iter->iter_flags |= TRACE_FILE_ANNOTATE; @@ -2375,9 +2381,6 @@ /* stop the trace while dumping */ tracing_stop(); - if (iter->trace && iter->trace->open) - iter->trace->open(iter); - mutex_unlock(&trace_types_lock); out: Index: ftrace/kernel/trace/trace.h =================================================================== --- ftrace.orig/kernel/trace/trace.h 2008-11-24 13:46:26.000000000 +0100 +++ ftrace/kernel/trace/trace.h 2008-11-25 08:18:05.000000000 +0100 @@ -311,6 +311,7 @@ int (*selftest)(struct tracer *trace, struct trace_array *tr); #endif + void (*print_header)(struct seq_file *m); enum print_line_t (*print_line)(struct trace_iterator *iter); /* If you handled the flag setting, return 0 */ int (*set_flag)(u32 old_flags, u32 bit, int set); --------------------------------------------------------------------- Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen Germany Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer Registergericht: Muenchen HRB 47456 Ust.-IdNr. VAT Registration No.: DE129385895 Citibank Frankfurt (BLZ 502 109 00) 600119052 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.
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