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perf: Add context field to perf_event

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The perf_event overflow handler does not receive any caller-derived
argument, so many callers need to resort to looking up the perf_event
in their local data structure.  This is ugly and doesn't scale if a
single callback services many perf_events.

Fix by adding a context parameter to perf_event_create_kernel_counter()
(and derived hardware breakpoints APIs) and storing it in the perf_event.
The field can be accessed from the callback as event->overflow_handler_context.
All callers are updated.

Signed-off-by: Avi Kivity <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Avi Kivity 2011-06-29 18:42:35 +03:00 • committed by Ingo Molnar
commit 4dc0da8696
12 changed files with 44 additions and 20 deletions
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3
arch/sh/kernel/ptrace_32.c
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@ -91,7 +91,8 @@ static int set_single_step(struct task_struct *tsk, unsigned long addr)
attr.bp_len = HW_BREAKPOINT_LEN_2;
attr.bp_type = HW_BREAKPOINT_R;
bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk);
bp = register_user_hw_breakpoint(&attr, ptrace_triggered,
NULL, tsk);
if (IS_ERR(bp))
return PTR_ERR(bp);