diff options
author | Will Deacon <will.deacon@arm.com> | 2017-02-20 16:33:50 +0300 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2017-03-16 11:51:10 +0300 |
commit | f4c0b0aa58d9b7e30ab0a95e33da84d53b3d764a (patch) | |
tree | 6223f1b6ee7214d36bc2b2d9a65b0e281181246b /kernel | |
parent | ed827adb009490673c9c63e0b716e0fa36afbcc1 (diff) | |
download | linux-f4c0b0aa58d9b7e30ab0a95e33da84d53b3d764a.tar.xz |
perf/core: Keep AUX flags in the output handle
In preparation for adding more flags to perf AUX records, introduce a
separate API for setting the flags for a session, rather than appending
more bool arguments to perf_aux_output_end. This allows to set each
flag at the time a corresponding condition is detected, instead of
tracking it in each driver's private state.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/20170220133352.17995-3-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/events/ring_buffer.c | 34 |
1 files changed, 23 insertions, 11 deletions
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 257fa460b846..9654e55c38d6 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -297,6 +297,19 @@ ring_buffer_init(struct ring_buffer *rb, long watermark, int flags) rb->paused = 1; } +void perf_aux_output_flag(struct perf_output_handle *handle, u64 flags) +{ + /* + * OVERWRITE is determined by perf_aux_output_end() and can't + * be passed in directly. + */ + if (WARN_ON_ONCE(flags & PERF_AUX_FLAG_OVERWRITE)) + return; + + handle->aux_flags |= flags; +} +EXPORT_SYMBOL_GPL(perf_aux_output_flag); + /* * This is called before hardware starts writing to the AUX area to * obtain an output handle and make sure there's room in the buffer. @@ -360,6 +373,7 @@ void *perf_aux_output_begin(struct perf_output_handle *handle, handle->event = event; handle->head = aux_head; handle->size = 0; + handle->aux_flags = 0; /* * In overwrite mode, AUX data stores do not depend on aux_tail, @@ -408,34 +422,32 @@ err: * of the AUX buffer management code is that after pmu::stop(), the AUX * transaction must be stopped and therefore drop the AUX reference count. */ -void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size, - bool truncated) +void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size) { struct ring_buffer *rb = handle->rb; - bool wakeup = truncated; + bool wakeup = !!handle->aux_flags; unsigned long aux_head; - u64 flags = 0; - - if (truncated) - flags |= PERF_AUX_FLAG_TRUNCATED; /* in overwrite mode, driver provides aux_head via handle */ if (rb->aux_overwrite) { - flags |= PERF_AUX_FLAG_OVERWRITE; + handle->aux_flags |= PERF_AUX_FLAG_OVERWRITE; aux_head = handle->head; local_set(&rb->aux_head, aux_head); } else { + handle->aux_flags &= ~PERF_AUX_FLAG_OVERWRITE; + aux_head = local_read(&rb->aux_head); local_add(size, &rb->aux_head); } - if (size || flags) { + if (size || handle->aux_flags) { /* * Only send RECORD_AUX if we have something useful to communicate */ - perf_event_aux_event(handle->event, aux_head, size, flags); + perf_event_aux_event(handle->event, aux_head, size, + handle->aux_flags); } aux_head = rb->user_page->aux_head = local_read(&rb->aux_head); @@ -446,7 +458,7 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size, } if (wakeup) { - if (truncated) + if (handle->aux_flags & PERF_AUX_FLAG_TRUNCATED) handle->event->pending_disable = 1; perf_output_wakeup(handle); } |