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authorOleg Nesterov <oleg@redhat.com>2013-02-02 16:27:52 +0100
committerOleg Nesterov <oleg@redhat.com>2013-02-08 18:28:02 +0100
commitf22c1bb6b4706be3502b378cb14564449b15f983 (patch)
treeac7d09e3d42f4ab77cac56b9cb7fba2d4bcabf06 /include/linux/perf_event.h
parent1b47aefd9b6bd439a4be43c47acd22987ac22db8 (diff)
downloadop-kernel-dev-f22c1bb6b4706be3502b378cb14564449b15f983.zip
op-kernel-dev-f22c1bb6b4706be3502b378cb14564449b15f983.tar.gz
perf: Introduce hw_perf_event->tp_target and ->tp_list
sys_perf_event_open()->perf_init_event(event) is called before find_get_context(event), this means that event->ctx == NULL when class->reg(TRACE_REG_PERF_REGISTER/OPEN) is called and thus it can't know if this event is per-task or system-wide. This patch adds hw_perf_event->tp_target for PERF_TYPE_TRACEPOINT, this is analogous to PERF_TYPE_BREAKPOINT/bp_target we already have. The patch also moves ->bp_target up so that it can overlap with the new member, this can help the compiler to generate the better code. trace_uprobe_register() will use it for prefiltering to avoid the unnecessary breakpoints in mm's we do not want to trace. ->tp_target doesn't have its own reference, but we can rely on the fact that either sys_perf_event_open() holds a reference, or it is equal to event->ctx->task. So this pointer is always valid until free_event(). Also add the "struct list_head tp_list" into this union. It is not strictly necessary, but it can simplify the next changes and we can add it for free. Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Diffstat (limited to 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 42adf01..e47ee46 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -135,16 +135,21 @@ struct hw_perf_event {
struct { /* software */
struct hrtimer hrtimer;
};
+ struct { /* tracepoint */
+ struct task_struct *tp_target;
+ /* for tp_event->class */
+ struct list_head tp_list;
+ };
#ifdef CONFIG_HAVE_HW_BREAKPOINT
struct { /* breakpoint */
- struct arch_hw_breakpoint info;
- struct list_head bp_list;
/*
* Crufty hack to avoid the chicken and egg
* problem hw_breakpoint has with context
* creation and event initalization.
*/
struct task_struct *bp_target;
+ struct arch_hw_breakpoint info;
+ struct list_head bp_list;
};
#endif
};
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