diff options
| author | Song Liu <songliubraving@fb.com> | 2018-10-01 22:36:36 -0700 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-10-10 22:14:17 -0400 |
| commit | a6ca88b241d5e929e6e60b12ad8cd288f0ffa256 (patch) | |
| tree | abb90d380a5c6e7ecd190b3a67745058b96fe564 /kernel/trace/trace_uprobe.c | |
| parent | 5a5e3d3ceae2121590d67258a4e658d938b4a46d (diff) | |
| download | linux-a6ca88b241d5e929e6e60b12ad8cd288f0ffa256.tar.bz2 | |
trace_uprobe: support reference counter in fd-based uprobe
This patch enables uprobes with reference counter in fd-based uprobe.
Highest 32 bits of perf_event_attr.config is used to stored offset
of the reference count (semaphore).
Format information in /sys/bus/event_source/devices/uprobe/format/ is
updated to reflect this new feature.
Link: http://lkml.kernel.org/r/20181002053636.1896903-1-songliubraving@fb.com
Cc: Oleg Nesterov <oleg@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-and-tested-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_uprobe.c')
| -rw-r--r-- | kernel/trace/trace_uprobe.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 3a7c73c40007..d09638706fe0 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -1405,7 +1405,8 @@ static int unregister_uprobe_event(struct trace_uprobe *tu) #ifdef CONFIG_PERF_EVENTS struct trace_event_call * -create_local_trace_uprobe(char *name, unsigned long offs, bool is_return) +create_local_trace_uprobe(char *name, unsigned long offs, + unsigned long ref_ctr_offset, bool is_return) { struct trace_uprobe *tu; struct path path; @@ -1437,6 +1438,7 @@ create_local_trace_uprobe(char *name, unsigned long offs, bool is_return) tu->offset = offs; tu->path = path; + tu->ref_ctr_offset = ref_ctr_offset; tu->filename = kstrdup(name, GFP_KERNEL); init_trace_event_call(tu, &tu->tp.call); |