On Tue, Jul 25, 2017 at 01:55:12PM +0200, Peter Zijlstra wrote:
SNIP
>
> diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c
> index 1b2be63c8528..c98a12f3592c 100644
> --- a/kernel/events/callchain.c
> +++ b/kernel/events/callchain.c
> @@ -12,6 +12,7 @@
> #include <linux/perf_event.h>
> #include <linux/slab.h>
> #include <linux/sched/task_stack.h>
> +#include <linux/task_work.h>
>
> #include "internal.h"
>
> @@ -178,19 +179,94 @@ put_callchain_entry(int rctx)
> put_recursion_context(this_cpu_ptr(callchain_recursion), rctx);
> }
>
> +static struct perf_callchain_entry __empty = { .nr = 0, };
> +
> +static void perf_callchain_work(struct callback_head *work)
> +{
> + struct perf_event *event = container_of(work, struct perf_event,
> pending_callchain);
> + struct perf_output_handle handle;
> + struct perf_sample_data sample;
> + size_t size;
> + int ret;
> +
> + struct {
> + struct perf_event_header header;
> + } callchain_event = {
> + .header = {
> + .type = PERF_RECORD_CALLCHAIN,
> + .misc = 0,
> + .size = sizeof(callchain_event),
> + },
> + };
how about we make this generic for all user space sample_type?
I think we could certainly use it for PERF_SAMPLE_STACK_USER,
maybe PERF_SAMPLE_REGS_USER would also help.. just a little ;-)
I'll check on that
jirka
