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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2015-01-14 14:18:15 +0200
committerIngo Molnar <mingo@kernel.org>2015-04-02 17:14:12 +0200
commit68db7e98c3a6ebe7284b6cf14906ed7c55f3f7f0 (patch)
treeaff39ee8c8f8703e262768397610c5949fd93f48 /kernel
parentbed5b25ad9c8a2f5d735ef0bc746ec870c01c1b0 (diff)
downloadop-kernel-dev-68db7e98c3a6ebe7284b6cf14906ed7c55f3f7f0.zip
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perf: Add AUX record
When there's new data in the AUX space, output a record indicating its offset and size and a set of flags, such as PERF_AUX_FLAG_TRUNCATED, to mean the described data was truncated to fit in the ring buffer. 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: Borislav Petkov <bp@alien8.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kaixu Xia <kaixu.xia@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Robert Richter <rric@kernel.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: adrian.hunter@intel.com Cc: kan.liang@intel.com Cc: markus.t.metzger@intel.com Cc: mathieu.poirier@linaro.org Link: http://lkml.kernel.org/r/1421237903-181015-7-git-send-email-alexander.shishkin@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/core.c34
-rw-r--r--kernel/events/internal.h3
2 files changed, 37 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 6d9fdae..dbc2eff 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5916,6 +5916,40 @@ void perf_event_mmap(struct vm_area_struct *vma)
perf_event_mmap_event(&mmap_event);
}
+void perf_event_aux_event(struct perf_event *event, unsigned long head,
+ unsigned long size, u64 flags)
+{
+ struct perf_output_handle handle;
+ struct perf_sample_data sample;
+ struct perf_aux_event {
+ struct perf_event_header header;
+ u64 offset;
+ u64 size;
+ u64 flags;
+ } rec = {
+ .header = {
+ .type = PERF_RECORD_AUX,
+ .misc = 0,
+ .size = sizeof(rec),
+ },
+ .offset = head,
+ .size = size,
+ .flags = flags,
+ };
+ int ret;
+
+ perf_event_header__init_id(&rec.header, &sample, event);
+ ret = perf_output_begin(&handle, event, rec.header.size);
+
+ if (ret)
+ return;
+
+ perf_output_put(&handle, rec);
+ perf_event__output_id_sample(event, &handle, &sample);
+
+ perf_output_end(&handle);
+}
+
/*
* IRQ throttle logging
*/
diff --git a/kernel/events/internal.h b/kernel/events/internal.h
index 0f6d080..4d117a9 100644
--- a/kernel/events/internal.h
+++ b/kernel/events/internal.h
@@ -62,6 +62,9 @@ static inline bool rb_has_aux(struct ring_buffer *rb)
return !!rb->aux_nr_pages;
}
+void perf_event_aux_event(struct perf_event *event, unsigned long head,
+ unsigned long size, u64 flags);
+
extern void
perf_event_header__init_id(struct perf_event_header *header,
struct perf_sample_data *data,
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