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Date: Fri, 20 Jun 2014 14:49:48 +0400
From: Stanislav Fomichev <stfomichev@...dex-team.ru>
To: a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
acme@...nel.org, dsahern@...il.com, stfomichev@...dex-team.ru,
jolsa@...hat.com, xiaoguangrong@...ux.vnet.ibm.com,
yangds.fnst@...fujitsu.com, adrian.hunter@...el.com,
namhyung@...nel.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 6/7] perf kvm: move perf_kvm__mmap_read into session utils
It will be reused by perf trace in the following commit.
Signed-off-by: Stanislav Fomichev <stfomichev@...dex-team.ru>
---
tools/perf/builtin-kvm.c | 88 +++--------------------------------------------
tools/perf/util/session.c | 85 +++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/session.h | 5 +++
3 files changed, 94 insertions(+), 84 deletions(-)
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 0f1e5a2f6ad7..a69ffe7512e5 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -885,89 +885,6 @@ static bool verify_vcpu(int vcpu)
*/
#define PERF_KVM__MAX_EVENTS_PER_MMAP 25
-static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
- u64 *mmap_time)
-{
- union perf_event *event;
- struct perf_sample sample;
- s64 n = 0;
- int err;
-
- *mmap_time = ULLONG_MAX;
- while ((event = perf_evlist__mmap_read(kvm->evlist, idx)) != NULL) {
- err = perf_evlist__parse_sample(kvm->evlist, event, &sample);
- if (err) {
- perf_evlist__mmap_consume(kvm->evlist, idx);
- pr_err("Failed to parse sample\n");
- return -1;
- }
-
- err = perf_session_queue_event(kvm->session, event, &sample, 0);
- /*
- * FIXME: Here we can't consume the event, as perf_session_queue_event will
- * point to it, and it'll get possibly overwritten by the kernel.
- */
- perf_evlist__mmap_consume(kvm->evlist, idx);
-
- if (err) {
- pr_err("Failed to enqueue sample: %d\n", err);
- return -1;
- }
-
- /* save time stamp of our first sample for this mmap */
- if (n == 0)
- *mmap_time = sample.time;
-
- /* limit events per mmap handled all at once */
- n++;
- if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
- break;
- }
-
- return n;
-}
-
-static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm)
-{
- int i, err, throttled = 0;
- s64 n, ntotal = 0;
- u64 flush_time = ULLONG_MAX, mmap_time;
-
- for (i = 0; i < kvm->evlist->nr_mmaps; i++) {
- n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time);
- if (n < 0)
- return -1;
-
- /* flush time is going to be the minimum of all the individual
- * mmap times. Essentially, we flush all the samples queued up
- * from the last pass under our minimal start time -- that leaves
- * a very small race for samples to come in with a lower timestamp.
- * The ioctl to return the perf_clock timestamp should close the
- * race entirely.
- */
- if (mmap_time < flush_time)
- flush_time = mmap_time;
-
- ntotal += n;
- if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
- throttled = 1;
- }
-
- /* flush queue after each round in which we processed events */
- if (ntotal) {
- kvm->session->ordered_samples.next_flush = flush_time;
- err = kvm->tool.finished_round(&kvm->tool, NULL, kvm->session);
- if (err) {
- if (kvm->lost_events)
- pr_info("\nLost events: %" PRIu64 "\n\n",
- kvm->lost_events);
- return err;
- }
- }
-
- return throttled;
-}
-
static volatile int done;
static void sig_handler(int sig __maybe_unused)
@@ -1133,7 +1050,10 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
while (!done) {
int rc;
- rc = perf_kvm__mmap_read(kvm);
+ rc = perf_session__mmap_read(&kvm->tool,
+ kvm->session,
+ kvm->evlist,
+ PERF_KVM__MAX_EVENTS_PER_MMAP);
if (rc < 0)
break;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 4526d966b10a..994846060c5e 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1671,3 +1671,88 @@ int __perf_session__set_tracepoints_handlers(struct perf_session *session,
out:
return err;
}
+
+static s64 perf_session__mmap_read_idx(struct perf_session *session,
+ int idx,
+ u64 *mmap_time,
+ int nr_per_mmap)
+{
+ union perf_event *event;
+ struct perf_sample sample;
+ s64 n = 0;
+ int err;
+
+ *mmap_time = ULLONG_MAX;
+ while ((event = perf_evlist__mmap_read(session->evlist, idx)) != NULL) {
+ err = perf_evlist__parse_sample(session->evlist, event, &sample);
+ if (err) {
+ perf_evlist__mmap_consume(session->evlist, idx);
+ pr_err("Failed to parse sample\n");
+ return -1;
+ }
+
+ err = perf_session_queue_event(session, event, &sample, 0);
+ /*
+ * FIXME: Here we can't consume the event, as perf_session_queue_event will
+ * point to it, and it'll get possibly overwritten by the kernel.
+ */
+ perf_evlist__mmap_consume(session->evlist, idx);
+
+ if (err) {
+ pr_err("Failed to enqueue sample: %d\n", err);
+ return -1;
+ }
+
+ /* save time stamp of our first sample for this mmap */
+ if (n == 0)
+ *mmap_time = sample.time;
+
+ /* limit events per mmap handled all at once */
+ n++;
+ if (n == nr_per_mmap)
+ break;
+ }
+
+ return n;
+}
+
+int perf_session__mmap_read(struct perf_tool *tool,
+ struct perf_session *session,
+ struct perf_evlist *evlist,
+ int nr_per_mmap)
+{
+ int i, err, throttled = 0;
+ s64 n, ntotal = 0;
+ u64 flush_time = ULLONG_MAX, mmap_time;
+
+ for (i = 0; i < evlist->nr_mmaps; i++) {
+ n = perf_session__mmap_read_idx(session, i, &mmap_time,
+ nr_per_mmap);
+ if (n < 0)
+ return -1;
+
+ /* flush time is going to be the minimum of all the individual
+ * mmap times. Essentially, we flush all the samples queued up
+ * from the last pass under our minimal start time -- that leaves
+ * a very small race for samples to come in with a lower timestamp.
+ * The ioctl to return the perf_clock timestamp should close the
+ * race entirely.
+ */
+ if (mmap_time < flush_time)
+ flush_time = mmap_time;
+
+ ntotal += n;
+ if (n == nr_per_mmap)
+ throttled = 1;
+ }
+
+ /* flush queue after each round in which we processed events */
+ if (ntotal) {
+ session->ordered_samples.next_flush = flush_time;
+ err = tool->finished_round(tool, NULL, session);
+ if (err)
+ return err;
+ }
+
+ return throttled;
+}
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 9494fb68828a..e79da3c1071e 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -133,4 +133,9 @@ int __perf_session__set_tracepoints_handlers(struct perf_session *session,
extern volatile int session_done;
#define session_done() (*(volatile int *)(&session_done))
+
+int perf_session__mmap_read(struct perf_tool *tool,
+ struct perf_session *session,
+ struct perf_evlist *evlist,
+ int nr_per_mmap);
#endif /* __PERF_SESSION_H */
--
1.8.3.2
--
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