user/sven/linux.git/scripts/recordmcount.pl, branch v2.6.30.7

ftrace: test for running of recordmcount.pl twice on an object

2009-01-18T19:15:26Z

Impact: fix failure of dynamic function tracer selftest In a course of development, a developer does several makes on their kernel. Sometimes, the make might do something abnormal. In the case of running the recordmcount.pl script on an object twice, the script will duplicate all the calls to mcount in the __mcount_loc section. On boot up, the dynamic function tracer is careful when it modifies code, and performs several consistency checks. One is to not modify the call site if it is not what it expects it to be. If a function call site is listed twice, the first entry will convert the site to a nop, and the second will fail because it expected to see a call to mcount, but instead it sees a nop. Thus, the function tracer is disabled. Eric Sesterhenn reported seeing: [ 1.055440] ftrace: converting mcount calls to 0f 1f 44 00 00 [ 1.055568] ftrace: allocating 29418 entries in 116 pages [ 1.061000] ------------[ cut here ]------------ [ 1.061000] WARNING: at kernel/trace/ftrace.c:441 [...] [ 1.060000] ---[ end trace 4eaa2a86a8e2da23 ]--- [ 1.060000] ftrace failed to modify [] check_corruption+0x3/0x2d [ 1.060000] actual: 0f:1f:44:00:00 This warning shows that check_corruption+0x3 already had a nop in its place (0x0f1f440000). After compiling another kernel the problem went away. Later Eric Paris notice the same type of issue. Luckily, he saved the vmlinux file that caused it. In the file we found a bunch of duplicate mcount call site records, which lead us to the script. Perhaps this problem only happens to people named Eric. This patch changes the script to test if the __mcount_loc already exists in the object file, and if it does, it will print out an error message and kill the compile. Reported-by: Eric Sesterhenn Reported-by: Eric Paris Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

ftrace, ia64: Add recordmcount for ia64

2009-01-14T11:11:22Z

Add recordmcount for ia64. Signed-off-by: Shaohua Li Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

ftrace, ia64: explictly ignore a file in recordmcount.pl

2009-01-14T11:11:13Z

In IA64, a function pointer isn't a 'unsigned long' but a 'struct {unsigned long ip, unsigned long gp}'. MCOUNT_ADDR is determined at link time not compile time, so explictly ignore kernel/trace/ftrace.o in recordmcount.pl. Signed-off-by: Shaohua Li Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

ftrace, ia64: make recordmcount distinct module compile

2009-01-14T11:11:08Z

In IA64, module build and kernel build use different option. Make recordmcount.pl differentiate the two cases. Signed-off-by: Shaohua Li Acked-by: Sam Ravnborg Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

tracing/function-graph-tracer: add a new .irqentry.text section

2008-12-12T10:14:07Z

Impact: let the function-graph-tracer be aware of the irq entrypoints Add a new .irqentry.text section to store the irq entrypoints functions inside the same section. This way, the tracer will be able to signal an interrupts triggering on output by recognizing these entrypoints. Also, make this section recordable for dynamic tracing. Signed-off-by: Frederic Weisbecker Signed-off-by: Ingo Molnar

ftrace: adding other non-leaving .text sections

2008-11-26T02:48:37Z

Impact: widen the scope of recordmcount.pl Besides .text section, there are three .text sections that won't be freed after kernel booting. They are: .sched.text, .spinlock.text and .kprobes.text, which contain functions we can trace. But the last section ".kprobes.text" is particular, which has been marked as "notrace", we ignore it. Thus we add other two sections. Signed-off-by: Liming Wang Acked-by: Steven Rostedt Signed-off-by: Ingo Molnar

ftrace: scripts/recordmcount.pl support for ARM

2008-11-23T10:43:32Z

Impact: extend scripts/recordmcount.pl to ARM Arm uses %progbits instead of @progbits and requires only 4 byte alignment. [ Thanks to Sam Ravnborg for mentioning that ARM uses %progbits ] Signed-off-by: Jim Radford Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

ftrace: specify $alignment for sh architecture

2008-11-23T10:42:29Z

Impact: extend scripts/recordmcount.pl with default alignment for SH Set $alignment=2 for the sh architecture so that a ".align 2" directive will be emitted for all __mcount_loc sections. Fix a whitspace error while I'm here (converted spaces to tabs). Signed-off-by: Matt Fleming Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

ftrace: create default variables for archs in recordmcount.pl

2008-11-23T10:37:25Z

Impact: cleanup of recordmcount.pl Now that more architectures are being ported to the MCOUNT_RECORD method, there is no reason to have each declare their own arch specific variable if most of them share the same value. This patch creates a set of default values for the arch specific variables based off of i386. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar

ftrace: add support for powerpc to recordmcount.pl script

2008-11-23T10:37:08Z

Impact: Add PowerPC port to recordmcount.pl script This patch updates the recordmcount.pl script to process PowerPC. Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar