xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf/core: Keep AUX flags in the output handle

Browse Source 
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>
This commit is contained in:
Will Deacon
2017-02-20 15:33:50 +02:00
committed by Ingo Molnar
parent ed827adb00
commit f4c0b0aa58
10 changed files with 56 additions and 49 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
kernel/events/ring_buffer.c
View File

@@ -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);
}