openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

tracing: add cpu_file intialization for ftrace_dump 

Impact: fix to ftrace_dump output corruption

The commit: b04cc6b1f6
  tracing/core: introduce per cpu tracing files

added a new field to the iterator called cpu_file. This was a handle
to differentiate between the per cpu trace output files and the
all cpu "trace" file. The all cpu "trace" file required setting this
to TRACE_PIPE_ALL_CPU.

The problem is that the ftrace_dump sets up its own iterator but was
not updated to handle this change. The result was only CPU 0 printing
out on crash and a lot of "<0>"'s also being printed.

Reported-by: Thomas Gleixner <tglx@linuxtronix.de>
Tested-by: Darren Hart <dvhtc@us.ibm.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2009-03-04 18:20:36 -05:00
parent efed792d67
commit e543ad7691
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/trace/trace.c
View File

@ -3918,8 +3918,10 @@ void ftrace_dump(void)
printk(KERN_TRACE "Dumping ftrace buffer:\n");
/* Simulate the iterator */
iter.tr = &global_trace;
iter.trace = current_trace;
iter.cpu_file = TRACE_PIPE_ALL_CPU;
/*
* We need to stop all tracing on all CPUS to read the