On Tue, 13 Mar 2018 18:26:03 +0530 Ravi Bangoria <ravi.bango...@linux.vnet.ibm.com> wrote:
> No functionality changes. Please consider to describe what is this change and why, here. > > Signed-off-by: Ravi Bangoria <ravi.bango...@linux.vnet.ibm.com> > --- > Documentation/trace/uprobetracer.txt | 16 +++++++++++++--- > kernel/trace/trace.c | 2 +- > 2 files changed, 14 insertions(+), 4 deletions(-) > > diff --git a/Documentation/trace/uprobetracer.txt > b/Documentation/trace/uprobetracer.txt > index bf526a7c..8fb13b0 100644 > --- a/Documentation/trace/uprobetracer.txt > +++ b/Documentation/trace/uprobetracer.txt > @@ -19,15 +19,25 @@ user to calculate the offset of the probepoint in the > object. > > Synopsis of uprobe_tracer > ------------------------- > - p[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a uprobe > - r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a return uprobe (uretprobe) > - -:[GRP/]EVENT : Clear uprobe or uretprobe event > + p[:[GRP/]EVENT] PATH:OFFSET[(REF_CTR_OFFSET)] [FETCHARGS] > + r[:[GRP/]EVENT] PATH:OFFSET[(REF_CTR_OFFSET)] [FETCHARGS] Ah, OK in this context, [] means optional syntax :) > + -:[GRP/]EVENT > + > + p : Set a uprobe > + r : Set a return uprobe (uretprobe) > + - : Clear uprobe or uretprobe event > > GRP : Group name. If omitted, "uprobes" is the default value. > EVENT : Event name. If omitted, the event name is generated based > on PATH+OFFSET. > PATH : Path to an executable or a library. > OFFSET : Offset where the probe is inserted. > + REF_CTR_OFFSET: Reference counter offset. Optional field. Reference count > + gate the invocation of probe. If present, by default > + reference count is 0. Kernel needs to increment it before > + tracing the probe and decrement it when done. This is > + identical to semaphore in Userspace Statically Defined > + Tracepoints (USDT). > > FETCHARGS : Arguments. Each probe can have up to 128 args. > %REG : Fetch register REG > diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c > index 20a2300..2104d03 100644 > --- a/kernel/trace/trace.c > +++ b/kernel/trace/trace.c > @@ -4604,7 +4604,7 @@ static int tracing_trace_options_open(struct inode > *inode, struct file *file) > "place (kretprobe): [<module>:]<symbol>[+<offset>]|<memaddr>\n" > #endif > #ifdef CONFIG_UPROBE_EVENTS > - "\t place: <path>:<offset>\n" > + " place (uprobe): <path>:<offset>[(ref_ctr_offset)]\n" > #endif > "\t args: <name>=fetcharg[:type]\n" > "\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n" > -- > 1.8.3.1 > -- Masami Hiramatsu <mhira...@kernel.org> -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
