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Revert "perf/x86/intel/pt: Fix sampling synchronization"

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This reverts commit 8cfe7610cd.
This commit is contained in:
Ksawlii 2024-11-24 00:23:16 +01:00
parent 7948f1fe22
commit e998f5437f
1 changed files with 8 additions and 7 deletions
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15
arch/x86/events/intel/pt.c
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@ -1586,7 +1586,6 @@ static void pt_event_stop(struct perf_event *event, int mode)
* see comment in intel_pt_interrupt().
*/
WRITE_ONCE(pt->handle_nmi, 0);
barrier();
pt_config_stop(event);
@ -1638,10 +1637,11 @@ static long pt_event_snapshot_aux(struct perf_event *event,
return 0;
/*
* There is no PT interrupt in this mode, so stop the trace and it will
* remain stopped while the buffer is copied.
* Here, handle_nmi tells us if the tracing is on
*/
pt_config_stop(event);
if (READ_ONCE(pt->handle_nmi))
pt_config_stop(event);
pt_read_offset(buf);
pt_update_head(pt);
@ -1653,10 +1653,11 @@ static long pt_event_snapshot_aux(struct perf_event *event,
ret = perf_output_copy_aux(&pt->handle, handle, from, to);
/*
* Here, handle_nmi tells us if the tracing was on.
* If the tracing was on, restart it.
* If the tracing was on when we turned up, restart it.
* Compiler barrier not needed as we couldn't have been
* preempted by anything that touches pt->handle_nmi.
*/
if (READ_ONCE(pt->handle_nmi))
if (pt->handle_nmi)
pt_config_start(event);
return ret;