Thank you for you clarification, Steven.
-Takahiro AKASHI
On 03/14/2014 03:33 AM, Steven Rostedt wrote:
On Thu, 2014-03-13 at 18:10 +, Will Deacon wrote:
+#else /* CONFIG_DYNAMIC_FTRACE */
+/*
+ * _mcount() is used to build the kernel with -pg option, but all the branch
+ * instructions
On 03/14/2014 03:10 AM, Will Deacon wrote:
On Thu, Mar 13, 2014 at 10:13:48AM +, AKASHI Takahiro wrote:
This patch allows "dynamic ftrace" if CONFIG_DYNAMIC_FTRACE is enabled.
Here we can turn on and off tracing dynamically per-function base.
On arm64, this is done by patching single branch
On Thu, 2014-03-13 at 18:10 +, Will Deacon wrote:
>
> > +#else /* CONFIG_DYNAMIC_FTRACE */
> > +/*
> > + * _mcount() is used to build the kernel with -pg option, but all the
> > branch
> > + * instructions to _mcount() are replaced to NOP initially at kernel start
> > up,
> > + * and later
On Thu, Mar 13, 2014 at 10:13:48AM +, AKASHI Takahiro wrote:
> This patch allows "dynamic ftrace" if CONFIG_DYNAMIC_FTRACE is enabled.
> Here we can turn on and off tracing dynamically per-function base.
>
> On arm64, this is done by patching single branch instruction to _mcount()
> inserted b
This patch allows "dynamic ftrace" if CONFIG_DYNAMIC_FTRACE is enabled.
Here we can turn on and off tracing dynamically per-function base.
On arm64, this is done by patching single branch instruction to _mcount()
inserted by gcc -pg option. The branch is replaced to NOP initially at
kernel start u
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