* [PATCH v8 1/7] perf util: Create streams
2020-10-09 2:28 [PATCH v8 0/7] perf: Stream comparison Jin Yao
@ 2020-10-09 2:28 ` Jin Yao
2020-10-09 2:28 ` [PATCH v8 2/7] perf util: Get the evsel_streams by evsel_idx Jin Yao
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Jin Yao @ 2020-10-09 2:28 UTC (permalink / raw)
To: acme, jolsa, peterz, mingo, alexander.shishkin
Cc: Linux-kernel, ak, kan.liang, yao.jin, Jin Yao
We define the stream is the branch history which is aggregated by
the branch records from perf samples. For example, the callchains
aggregated from the branch records are considered as streams.
By browsing the hot stream, we can understand the hot code path.
Now we only support the callchain for stream. For measuring the
hot level for a stream, we use the callchain_node->hit, higher
is hotter.
There may be many callchains sampled so we only focus on the top
N hottest callchains. N is a user defined parameter or predefined
default value (nr_streams_max).
This patch creates an evsel_streams array per event, and saves
the top N hottest streams in a stream array.
So now we can get the per-event top N hottest streams.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
v8:
- Rebase to perf/core
v7:
- Create a new struct evlist_streams.
- Rename functions with appropriate prefix
v6:
- Rebase to perf/core
v5:
- Remove enum stram_type
- Rebase to perf/core
v4:
- Refactor the code
- Rename patch name from 'perf util: Create streams for managing
top N hottest callchains' to 'perf util: Create streams'
v2:
- Use zfree in free_evsel_streams().
tools/perf/util/Build | 1 +
tools/perf/util/stream.c | 164 +++++++++++++++++++++++++++++++++++++++
tools/perf/util/stream.h | 30 +++++++
3 files changed, 195 insertions(+)
create mode 100644 tools/perf/util/stream.c
create mode 100644 tools/perf/util/stream.h
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index eebbd5223cae..e2563d0154eb 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -102,6 +102,7 @@ perf-y += rwsem.o
perf-y += thread-stack.o
perf-y += spark.o
perf-y += topdown.o
+perf-y += stream.o
perf-$(CONFIG_AUXTRACE) += auxtrace.o
perf-$(CONFIG_AUXTRACE) += intel-pt-decoder/
perf-$(CONFIG_AUXTRACE) += intel-pt.o
diff --git a/tools/perf/util/stream.c b/tools/perf/util/stream.c
new file mode 100644
index 000000000000..31efe4ae0f55
--- /dev/null
+++ b/tools/perf/util/stream.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Compare and figure out the top N hottest streams
+ * Copyright (c) 2020, Intel Corporation.
+ * Author: Jin Yao
+ */
+
+#include <inttypes.h>
+#include <stdlib.h>
+#include <linux/zalloc.h>
+#include "debug.h"
+#include "hist.h"
+#include "sort.h"
+#include "stream.h"
+#include "evlist.h"
+
+static void evsel_streams__delete(struct evsel_streams *es, int nr_evsel)
+{
+ for (int i = 0; i < nr_evsel; i++)
+ zfree(&es[i].streams);
+
+ free(es);
+}
+
+void evlist_streams__delete(struct evlist_streams *els)
+{
+ evsel_streams__delete(els->ev_streams, els->nr_evsel);
+ free(els);
+}
+
+static struct evlist_streams *evlist_streams__new(int nr_evsel,
+ int nr_streams_max)
+{
+ struct evlist_streams *els;
+ struct evsel_streams *es;
+
+ els = zalloc(sizeof(*els));
+ if (!els)
+ return NULL;
+
+ es = calloc(nr_evsel, sizeof(struct evsel_streams));
+ if (!es) {
+ free(els);
+ return NULL;
+ }
+
+ for (int i = 0; i < nr_evsel; i++) {
+ struct evsel_streams *s = &es[i];
+
+ s->streams = calloc(nr_streams_max, sizeof(struct stream));
+ if (!s->streams)
+ goto err;
+
+ s->nr_streams_max = nr_streams_max;
+ s->evsel_idx = -1;
+ }
+
+ els->ev_streams = es;
+ els->nr_evsel = nr_evsel;
+ return els;
+
+err:
+ evsel_streams__delete(es, nr_evsel);
+ return NULL;
+}
+
+/*
+ * The cnodes with high hit number are hot callchains.
+ */
+static void evsel_streams__set_hot_cnode(struct evsel_streams *es,
+ struct callchain_node *cnode)
+{
+ int i, idx = 0;
+ u64 hit;
+
+ if (es->nr_streams < es->nr_streams_max) {
+ i = es->nr_streams;
+ es->streams[i].cnode = cnode;
+ es->nr_streams++;
+ return;
+ }
+
+ /*
+ * Considering a few number of hot streams, only use simple
+ * way to find the cnode with smallest hit number and replace.
+ */
+ hit = (es->streams[0].cnode)->hit;
+ for (i = 1; i < es->nr_streams; i++) {
+ if ((es->streams[i].cnode)->hit < hit) {
+ hit = (es->streams[i].cnode)->hit;
+ idx = i;
+ }
+ }
+
+ if (cnode->hit > hit)
+ es->streams[idx].cnode = cnode;
+}
+
+static void update_hot_callchain(struct hist_entry *he,
+ struct evsel_streams *es)
+{
+ struct rb_root *root = &he->sorted_chain;
+ struct rb_node *rb_node = rb_first(root);
+ struct callchain_node *cnode;
+
+ while (rb_node) {
+ cnode = rb_entry(rb_node, struct callchain_node, rb_node);
+ evsel_streams__set_hot_cnode(es, cnode);
+ rb_node = rb_next(rb_node);
+ }
+}
+
+static void init_hot_callchain(struct hists *hists, struct evsel_streams *es)
+{
+ struct rb_node *next = rb_first_cached(&hists->entries);
+
+ while (next) {
+ struct hist_entry *he;
+
+ he = rb_entry(next, struct hist_entry, rb_node);
+ update_hot_callchain(he, es);
+ next = rb_next(&he->rb_node);
+ }
+}
+
+static int evlist__init_callchain_streams(struct evlist *evlist,
+ struct evlist_streams *els)
+{
+ struct evsel_streams *es = els->ev_streams;
+ struct evsel *pos;
+ int i = 0;
+
+ BUG_ON(els->nr_evsel < evlist->core.nr_entries);
+
+ evlist__for_each_entry(evlist, pos) {
+ struct hists *hists = evsel__hists(pos);
+
+ hists__output_resort(hists, NULL);
+ init_hot_callchain(hists, &es[i]);
+ es[i].evsel_idx = pos->idx;
+ i++;
+ }
+
+ return 0;
+}
+
+struct evlist_streams *evlist__create_streams(struct evlist *evlist,
+ int nr_streams_max)
+{
+ int nr_evsel = evlist->core.nr_entries, ret = -1;
+ struct evlist_streams *els = evlist_streams__new(nr_evsel,
+ nr_streams_max);
+
+ if (!els)
+ return NULL;
+
+ ret = evlist__init_callchain_streams(evlist, els);
+ if (ret) {
+ evlist_streams__delete(els);
+ return NULL;
+ }
+
+ return els;
+}
diff --git a/tools/perf/util/stream.h b/tools/perf/util/stream.h
new file mode 100644
index 000000000000..35bc64df554c
--- /dev/null
+++ b/tools/perf/util/stream.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_STREAM_H
+#define __PERF_STREAM_H
+
+#include "callchain.h"
+
+struct stream {
+ struct callchain_node *cnode;
+};
+
+struct evsel_streams {
+ struct stream *streams;
+ int nr_streams_max;
+ int nr_streams;
+ int evsel_idx;
+};
+
+struct evlist_streams {
+ struct evsel_streams *ev_streams;
+ int nr_evsel;
+};
+
+struct evlist;
+
+void evlist_streams__delete(struct evlist_streams *els);
+
+struct evlist_streams *evlist__create_streams(struct evlist *evlist,
+ int nr_streams_max);
+
+#endif /* __PERF_STREAM_H */
--
2.17.1
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v8 2/7] perf util: Get the evsel_streams by evsel_idx
2020-10-09 2:28 [PATCH v8 0/7] perf: Stream comparison Jin Yao
2020-10-09 2:28 ` [PATCH v8 1/7] perf util: Create streams Jin Yao
@ 2020-10-09 2:28 ` Jin Yao
2020-10-09 2:28 ` [PATCH v8 3/7] perf util: Compare two streams Jin Yao
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Jin Yao @ 2020-10-09 2:28 UTC (permalink / raw)
To: acme, jolsa, peterz, mingo, alexander.shishkin
Cc: Linux-kernel, ak, kan.liang, yao.jin, Jin Yao
In previous patch, we have created evsel_streams array
This patch returns the specified evsel_streams according to the
evsel_idx.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
v8:
- No change
v7:
- Rename functions:
evsel_streams__entry
v6:
- Rebase to perf/core
v5:
- Rebase to perf/core
v4:
- Rename the patch from 'perf util: Return per-event callchain
streams' to 'perf util: Get the evsel_streams by evsel_idx'
tools/perf/util/stream.c | 13 +++++++++++++
tools/perf/util/stream.h | 3 +++
2 files changed, 16 insertions(+)
diff --git a/tools/perf/util/stream.c b/tools/perf/util/stream.c
index 31efe4ae0f55..e1c7d6c6126b 100644
--- a/tools/perf/util/stream.c
+++ b/tools/perf/util/stream.c
@@ -162,3 +162,16 @@ struct evlist_streams *evlist__create_streams(struct evlist *evlist,
return els;
}
+
+struct evsel_streams *evsel_streams__entry(struct evlist_streams *els,
+ int evsel_idx)
+{
+ struct evsel_streams *es = els->ev_streams;
+
+ for (int i = 0; i < els->nr_evsel; i++) {
+ if (es[i].evsel_idx == evsel_idx)
+ return &es[i];
+ }
+
+ return NULL;
+}
diff --git a/tools/perf/util/stream.h b/tools/perf/util/stream.h
index 35bc64df554c..f01335677479 100644
--- a/tools/perf/util/stream.h
+++ b/tools/perf/util/stream.h
@@ -27,4 +27,7 @@ void evlist_streams__delete(struct evlist_streams *els);
struct evlist_streams *evlist__create_streams(struct evlist *evlist,
int nr_streams_max);
+struct evsel_streams *evsel_streams__entry(struct evlist_streams *els,
+ int evsel_idx);
+
#endif /* __PERF_STREAM_H */
--
2.17.1
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v8 3/7] perf util: Compare two streams
2020-10-09 2:28 [PATCH v8 0/7] perf: Stream comparison Jin Yao
2020-10-09 2:28 ` [PATCH v8 1/7] perf util: Create streams Jin Yao
2020-10-09 2:28 ` [PATCH v8 2/7] perf util: Get the evsel_streams by evsel_idx Jin Yao
@ 2020-10-09 2:28 ` Jin Yao
2020-10-09 2:28 ` [PATCH v8 4/7] perf util: Link stream pair Jin Yao
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Jin Yao @ 2020-10-09 2:28 UTC (permalink / raw)
To: acme, jolsa, peterz, mingo, alexander.shishkin
Cc: Linux-kernel, ak, kan.liang, yao.jin, Jin Yao
Stream is the branch history which is aggregated by the branch
records from perf samples. Now we support the callchain as
stream.
If the callchain entries of one stream are fully matched with
the callchain entries of another stream, we think two streams
are matched.
For example,
cycles: 1, hits: 26.80% cycles: 1, hits: 27.30%
----------------------- -----------------------
main div.c:39 main div.c:39
main div.c:44 main div.c:44
Above two streams are matched (we don't consider the case that
source code is changed).
The matching logic is, compare the chain string first. If it's not
matched, fallback to dso address comparison.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
v7/v8:
- No change
v6:
- Rebase to perf/core
v5:
- Remove enum stream_type
- Rebase to perf/core
v4:
- Remove original source line comparison code.
tools/perf/util/callchain.c | 54 +++++++++++++++++++++++++++++++++++++
tools/perf/util/callchain.h | 4 +++
2 files changed, 58 insertions(+)
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 2775b752f2fa..d356e73c5622 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1613,3 +1613,57 @@ void callchain_param_setup(u64 sample_type)
callchain_param.record_mode = CALLCHAIN_FP;
}
}
+
+static bool chain_match(struct callchain_list *base_chain,
+ struct callchain_list *pair_chain)
+{
+ enum match_result match;
+
+ match = match_chain_strings(base_chain->srcline,
+ pair_chain->srcline);
+ if (match != MATCH_ERROR)
+ return match == MATCH_EQ;
+
+ match = match_chain_dso_addresses(base_chain->ms.map,
+ base_chain->ip,
+ pair_chain->ms.map,
+ pair_chain->ip);
+
+ return match == MATCH_EQ;
+}
+
+bool callchain_cnode_matched(struct callchain_node *base_cnode,
+ struct callchain_node *pair_cnode)
+{
+ struct callchain_list *base_chain, *pair_chain;
+ bool match = false;
+
+ pair_chain = list_first_entry(&pair_cnode->val,
+ struct callchain_list,
+ list);
+
+ list_for_each_entry(base_chain, &base_cnode->val, list) {
+ if (&pair_chain->list == &pair_cnode->val)
+ return false;
+
+ if (!base_chain->srcline || !pair_chain->srcline) {
+ pair_chain = list_next_entry(pair_chain, list);
+ continue;
+ }
+
+ match = chain_match(base_chain, pair_chain);
+ if (!match)
+ return false;
+
+ pair_chain = list_next_entry(pair_chain, list);
+ }
+
+ /*
+ * Say chain1 is ABC, chain2 is ABCD, we consider they are
+ * not fully matched.
+ */
+ if (pair_chain && (&pair_chain->list != &pair_cnode->val))
+ return false;
+
+ return match;
+}
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index fe36a9e5ccd1..ad27fc8c7948 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -298,4 +298,8 @@ int callchain_branch_counts(struct callchain_root *root,
u64 *abort_count, u64 *cycles_count);
void callchain_param_setup(u64 sample_type);
+
+bool callchain_cnode_matched(struct callchain_node *base_cnode,
+ struct callchain_node *pair_cnode);
+
#endif /* __PERF_CALLCHAIN_H */
--
2.17.1
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v8 4/7] perf util: Link stream pair
2020-10-09 2:28 [PATCH v8 0/7] perf: Stream comparison Jin Yao
` (2 preceding siblings ...)
2020-10-09 2:28 ` [PATCH v8 3/7] perf util: Compare two streams Jin Yao
@ 2020-10-09 2:28 ` Jin Yao
2020-10-09 2:28 ` [PATCH v8 5/7] perf util: Calculate the sum of total streams hits Jin Yao
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Jin Yao @ 2020-10-09 2:28 UTC (permalink / raw)
To: acme, jolsa, peterz, mingo, alexander.shishkin
Cc: Linux-kernel, ak, kan.liang, yao.jin, Jin Yao
In previous patch, we have created an evsel_streams for one event,
and top N hottest streams will be saved in a stream array in
evsel_streams.
This patch compares total streams among two evsel_streams.
Once two streams are fully matched, they will be linked as
a pair. From the pair, we can know which streams are matched.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
v8:
- No change
v7:
- Rename functions with 'stream__' prefix.
v6:
- Rebase to perf/core
v5:
- Remove enum stream_type
v4:
- New patch in v4.
tools/perf/util/stream.c | 40 ++++++++++++++++++++++++++++++++++++++++
tools/perf/util/stream.h | 4 ++++
2 files changed, 44 insertions(+)
diff --git a/tools/perf/util/stream.c b/tools/perf/util/stream.c
index e1c7d6c6126b..0d6a7452320a 100644
--- a/tools/perf/util/stream.c
+++ b/tools/perf/util/stream.c
@@ -175,3 +175,43 @@ struct evsel_streams *evsel_streams__entry(struct evlist_streams *els,
return NULL;
}
+
+static struct stream *stream__callchain_match(struct stream *base_stream,
+ struct evsel_streams *es_pair)
+{
+ for (int i = 0; i < es_pair->nr_streams; i++) {
+ struct stream *pair_stream = &es_pair->streams[i];
+
+ if (callchain_cnode_matched(base_stream->cnode,
+ pair_stream->cnode)) {
+ return pair_stream;
+ }
+ }
+
+ return NULL;
+}
+
+static struct stream *stream__match(struct stream *base_stream,
+ struct evsel_streams *es_pair)
+{
+ return stream__callchain_match(base_stream, es_pair);
+}
+
+static void stream__link(struct stream *base_stream, struct stream *pair_stream)
+{
+ base_stream->pair_cnode = pair_stream->cnode;
+ pair_stream->pair_cnode = base_stream->cnode;
+}
+
+void evsel_streams__match(struct evsel_streams *es_base,
+ struct evsel_streams *es_pair)
+{
+ for (int i = 0; i < es_base->nr_streams; i++) {
+ struct stream *base_stream = &es_base->streams[i];
+ struct stream *pair_stream;
+
+ pair_stream = stream__match(base_stream, es_pair);
+ if (pair_stream)
+ stream__link(base_stream, pair_stream);
+ }
+}
diff --git a/tools/perf/util/stream.h b/tools/perf/util/stream.h
index f01335677479..cb131f41f5b1 100644
--- a/tools/perf/util/stream.h
+++ b/tools/perf/util/stream.h
@@ -6,6 +6,7 @@
struct stream {
struct callchain_node *cnode;
+ struct callchain_node *pair_cnode;
};
struct evsel_streams {
@@ -30,4 +31,7 @@ struct evlist_streams *evlist__create_streams(struct evlist *evlist,
struct evsel_streams *evsel_streams__entry(struct evlist_streams *els,
int evsel_idx);
+void evsel_streams__match(struct evsel_streams *es_base,
+ struct evsel_streams *es_pair);
+
#endif /* __PERF_STREAM_H */
--
2.17.1
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v8 5/7] perf util: Calculate the sum of total streams hits
2020-10-09 2:28 [PATCH v8 0/7] perf: Stream comparison Jin Yao
` (3 preceding siblings ...)
2020-10-09 2:28 ` [PATCH v8 4/7] perf util: Link stream pair Jin Yao
@ 2020-10-09 2:28 ` Jin Yao
2020-10-09 2:28 ` [PATCH v8 6/7] perf util: Report hot streams Jin Yao
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Jin Yao @ 2020-10-09 2:28 UTC (permalink / raw)
To: acme, jolsa, peterz, mingo, alexander.shishkin
Cc: Linux-kernel, ak, kan.liang, yao.jin, Jin Yao
We have used callchain_node->hit to measure the hot level of one
stream. This patch calculates the sum of hits of total streams.
Thus in next patch, we can use following formula to report hot
percent for one stream.
hot percent = callchain_node->hit / sum of total hits
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
v7/v8:
- No change
v6:
- Rebase to perf/core
v5:
- Rebase to perf/core
v4:
- No functional change.
v2:
- Combine the variable decl line with its initial assignment
in total_callchain_hits().
tools/perf/util/callchain.c | 32 ++++++++++++++++++++++++++++++++
tools/perf/util/callchain.h | 3 +++
tools/perf/util/stream.c | 2 ++
tools/perf/util/stream.h | 1 +
4 files changed, 38 insertions(+)
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index d356e73c5622..4f824bfcc072 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1667,3 +1667,35 @@ bool callchain_cnode_matched(struct callchain_node *base_cnode,
return match;
}
+
+static u64 count_callchain_hits(struct hist_entry *he)
+{
+ struct rb_root *root = &he->sorted_chain;
+ struct rb_node *rb_node = rb_first(root);
+ struct callchain_node *node;
+ u64 chain_hits = 0;
+
+ while (rb_node) {
+ node = rb_entry(rb_node, struct callchain_node, rb_node);
+ chain_hits += node->hit;
+ rb_node = rb_next(rb_node);
+ }
+
+ return chain_hits;
+}
+
+u64 callchain_total_hits(struct hists *hists)
+{
+ struct rb_node *next = rb_first_cached(&hists->entries);
+ u64 chain_hits = 0;
+
+ while (next) {
+ struct hist_entry *he = rb_entry(next, struct hist_entry,
+ rb_node);
+
+ chain_hits += count_callchain_hits(he);
+ next = rb_next(&he->rb_node);
+ }
+
+ return chain_hits;
+}
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index ad27fc8c7948..ac5bea9c1eb7 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -13,6 +13,7 @@ struct ip_callchain;
struct map;
struct perf_sample;
struct thread;
+struct hists;
#define HELP_PAD "\t\t\t\t"
@@ -302,4 +303,6 @@ void callchain_param_setup(u64 sample_type);
bool callchain_cnode_matched(struct callchain_node *base_cnode,
struct callchain_node *pair_cnode);
+u64 callchain_total_hits(struct hists *hists);
+
#endif /* __PERF_CALLCHAIN_H */
diff --git a/tools/perf/util/stream.c b/tools/perf/util/stream.c
index 0d6a7452320a..47c5956b3378 100644
--- a/tools/perf/util/stream.c
+++ b/tools/perf/util/stream.c
@@ -121,6 +121,8 @@ static void init_hot_callchain(struct hists *hists, struct evsel_streams *es)
update_hot_callchain(he, es);
next = rb_next(&he->rb_node);
}
+
+ es->streams_hits = callchain_total_hits(hists);
}
static int evlist__init_callchain_streams(struct evlist *evlist,
diff --git a/tools/perf/util/stream.h b/tools/perf/util/stream.h
index cb131f41f5b1..a61072eda64d 100644
--- a/tools/perf/util/stream.h
+++ b/tools/perf/util/stream.h
@@ -14,6 +14,7 @@ struct evsel_streams {
int nr_streams_max;
int nr_streams;
int evsel_idx;
+ u64 streams_hits;
};
struct evlist_streams {
--
2.17.1
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v8 6/7] perf util: Report hot streams
2020-10-09 2:28 [PATCH v8 0/7] perf: Stream comparison Jin Yao
` (4 preceding siblings ...)
2020-10-09 2:28 ` [PATCH v8 5/7] perf util: Calculate the sum of total streams hits Jin Yao
@ 2020-10-09 2:28 ` Jin Yao
2020-10-09 2:28 ` [PATCH v8 7/7] perf diff: Support hot streams comparison Jin Yao
2020-10-13 4:25 ` [PATCH v8 0/7] perf: Stream comparison Jin, Yao
7 siblings, 0 replies; 9+ messages in thread
From: Jin Yao @ 2020-10-09 2:28 UTC (permalink / raw)
To: acme, jolsa, peterz, mingo, alexander.shishkin
Cc: Linux-kernel, ak, kan.liang, yao.jin, Jin Yao
We show the streams separately. They are divided into different sections.
1. "Matched hot streams"
2. "Hot streams in old perf data only"
3. "Hot streams in new perf data only".
For each stream, we report the cycles and hot percent (hits%).
For example,
cycles: 2, hits: 4.08%
--------------------------
main div.c:42
compute_flag div.c:28
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
v8:
- No change
v7:
- Rename functions with 'evsel_streams__' prefix
v6:
- Rebase to perf/core
v5:
- Rebase to perf/core
v4:
- Remove "Hot chains in old perf data but source line changed
in new perf data"
tools/perf/util/callchain.c | 13 ++++
tools/perf/util/callchain.h | 2 +
tools/perf/util/stream.c | 123 ++++++++++++++++++++++++++++++++++++
tools/perf/util/stream.h | 3 +
4 files changed, 141 insertions(+)
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 4f824bfcc072..1b60985690bb 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1699,3 +1699,16 @@ u64 callchain_total_hits(struct hists *hists)
return chain_hits;
}
+
+s64 callchain_avg_cycles(struct callchain_node *cnode)
+{
+ struct callchain_list *chain;
+ s64 cycles = 0;
+
+ list_for_each_entry(chain, &cnode->val, list) {
+ if (chain->srcline && chain->branch_count)
+ cycles += chain->cycles_count / chain->branch_count;
+ }
+
+ return cycles;
+}
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index ac5bea9c1eb7..5824134f983b 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -305,4 +305,6 @@ bool callchain_cnode_matched(struct callchain_node *base_cnode,
u64 callchain_total_hits(struct hists *hists);
+s64 callchain_avg_cycles(struct callchain_node *cnode);
+
#endif /* __PERF_CALLCHAIN_H */
diff --git a/tools/perf/util/stream.c b/tools/perf/util/stream.c
index 47c5956b3378..4bd5e5a00aa5 100644
--- a/tools/perf/util/stream.c
+++ b/tools/perf/util/stream.c
@@ -217,3 +217,126 @@ void evsel_streams__match(struct evsel_streams *es_base,
stream__link(base_stream, pair_stream);
}
}
+
+static void print_callchain_pair(struct stream *base_stream, int idx,
+ struct evsel_streams *es_base,
+ struct evsel_streams *es_pair)
+{
+ struct callchain_node *base_cnode = base_stream->cnode;
+ struct callchain_node *pair_cnode = base_stream->pair_cnode;
+ struct callchain_list *base_chain, *pair_chain;
+ char buf1[512], buf2[512], cbuf1[256], cbuf2[256];
+ char *s1, *s2;
+ double pct;
+
+ printf("\nhot chain pair %d:\n", idx);
+
+ pct = (double)base_cnode->hit / (double)es_base->streams_hits;
+ scnprintf(buf1, sizeof(buf1), "cycles: %ld, hits: %.2f%%",
+ callchain_avg_cycles(base_cnode), pct * 100.0);
+
+ pct = (double)pair_cnode->hit / (double)es_pair->streams_hits;
+ scnprintf(buf2, sizeof(buf2), "cycles: %ld, hits: %.2f%%",
+ callchain_avg_cycles(pair_cnode), pct * 100.0);
+
+ printf("%35s\t%35s\n", buf1, buf2);
+
+ printf("%35s\t%35s\n",
+ "---------------------------",
+ "--------------------------");
+
+ pair_chain = list_first_entry(&pair_cnode->val,
+ struct callchain_list,
+ list);
+
+ list_for_each_entry(base_chain, &base_cnode->val, list) {
+ if (&pair_chain->list == &pair_cnode->val)
+ return;
+
+ s1 = callchain_list__sym_name(base_chain, cbuf1, sizeof(cbuf1),
+ false);
+ s2 = callchain_list__sym_name(pair_chain, cbuf2, sizeof(cbuf2),
+ false);
+
+ scnprintf(buf1, sizeof(buf1), "%35s\t%35s", s1, s2);
+ printf("%s\n", buf1);
+ pair_chain = list_next_entry(pair_chain, list);
+ }
+}
+
+static void print_stream_callchain(struct stream *stream, int idx,
+ struct evsel_streams *es, bool pair)
+{
+ struct callchain_node *cnode = stream->cnode;
+ struct callchain_list *chain;
+ char buf[512], cbuf[256], *s;
+ double pct;
+
+ printf("\nhot chain %d:\n", idx);
+
+ pct = (double)cnode->hit / (double)es->streams_hits;
+ scnprintf(buf, sizeof(buf), "cycles: %ld, hits: %.2f%%",
+ callchain_avg_cycles(cnode), pct * 100.0);
+
+ if (pair) {
+ printf("%35s\t%35s\n", "", buf);
+ printf("%35s\t%35s\n",
+ "", "--------------------------");
+ } else {
+ printf("%35s\n", buf);
+ printf("%35s\n", "--------------------------");
+ }
+
+ list_for_each_entry(chain, &cnode->val, list) {
+ s = callchain_list__sym_name(chain, cbuf, sizeof(cbuf), false);
+
+ if (pair)
+ scnprintf(buf, sizeof(buf), "%35s\t%35s", "", s);
+ else
+ scnprintf(buf, sizeof(buf), "%35s", s);
+
+ printf("%s\n", buf);
+ }
+}
+
+static void callchain_streams_report(struct evsel_streams *es_base,
+ struct evsel_streams *es_pair)
+{
+ struct stream *base_stream;
+ int i, idx = 0;
+
+ printf("[ Matched hot streams ]\n");
+ for (i = 0; i < es_base->nr_streams; i++) {
+ base_stream = &es_base->streams[i];
+ if (base_stream->pair_cnode) {
+ print_callchain_pair(base_stream, ++idx,
+ es_base, es_pair);
+ }
+ }
+
+ idx = 0;
+ printf("\n[ Hot streams in old perf data only ]\n");
+ for (i = 0; i < es_base->nr_streams; i++) {
+ base_stream = &es_base->streams[i];
+ if (!base_stream->pair_cnode) {
+ print_stream_callchain(base_stream, ++idx,
+ es_base, false);
+ }
+ }
+
+ idx = 0;
+ printf("\n[ Hot streams in new perf data only ]\n");
+ for (i = 0; i < es_pair->nr_streams; i++) {
+ base_stream = &es_pair->streams[i];
+ if (!base_stream->pair_cnode) {
+ print_stream_callchain(base_stream, ++idx,
+ es_pair, true);
+ }
+ }
+}
+
+void evsel_streams__report(struct evsel_streams *es_base,
+ struct evsel_streams *es_pair)
+{
+ return callchain_streams_report(es_base, es_pair);
+}
diff --git a/tools/perf/util/stream.h b/tools/perf/util/stream.h
index a61072eda64d..bee768874fea 100644
--- a/tools/perf/util/stream.h
+++ b/tools/perf/util/stream.h
@@ -35,4 +35,7 @@ struct evsel_streams *evsel_streams__entry(struct evlist_streams *els,
void evsel_streams__match(struct evsel_streams *es_base,
struct evsel_streams *es_pair);
+void evsel_streams__report(struct evsel_streams *es_base,
+ struct evsel_streams *es_pair);
+
#endif /* __PERF_STREAM_H */
--
2.17.1
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v8 7/7] perf diff: Support hot streams comparison
2020-10-09 2:28 [PATCH v8 0/7] perf: Stream comparison Jin Yao
` (5 preceding siblings ...)
2020-10-09 2:28 ` [PATCH v8 6/7] perf util: Report hot streams Jin Yao
@ 2020-10-09 2:28 ` Jin Yao
2020-10-13 4:25 ` [PATCH v8 0/7] perf: Stream comparison Jin, Yao
7 siblings, 0 replies; 9+ messages in thread
From: Jin Yao @ 2020-10-09 2:28 UTC (permalink / raw)
To: acme, jolsa, peterz, mingo, alexander.shishkin
Cc: Linux-kernel, ak, kan.liang, yao.jin, Jin Yao
This patch enables perf-diff with "--stream" option.
"--stream": Enable hot streams comparison
Now let's see example.
perf record -b ... Generate perf.data.old with branch data
perf record -b ... Generate perf.data with branch data
perf diff --stream
[ Matched hot streams ]
hot chain pair 1:
cycles: 1, hits: 27.77% cycles: 1, hits: 9.24%
--------------------------- --------------------------
main div.c:39 main div.c:39
main div.c:44 main div.c:44
hot chain pair 2:
cycles: 34, hits: 20.06% cycles: 27, hits: 16.98%
--------------------------- --------------------------
__random_r random_r.c:360 __random_r random_r.c:360
__random_r random_r.c:388 __random_r random_r.c:388
__random_r random_r.c:388 __random_r random_r.c:388
__random_r random_r.c:380 __random_r random_r.c:380
__random_r random_r.c:357 __random_r random_r.c:357
__random random.c:293 __random random.c:293
__random random.c:293 __random random.c:293
__random random.c:291 __random random.c:291
__random random.c:291 __random random.c:291
__random random.c:291 __random random.c:291
__random random.c:288 __random random.c:288
rand rand.c:27 rand rand.c:27
rand rand.c:26 rand rand.c:26
rand@plt rand@plt
rand@plt rand@plt
compute_flag div.c:25 compute_flag div.c:25
compute_flag div.c:22 compute_flag div.c:22
main div.c:40 main div.c:40
main div.c:40 main div.c:40
main div.c:39 main div.c:39
hot chain pair 3:
cycles: 9, hits: 4.48% cycles: 6, hits: 4.51%
--------------------------- --------------------------
__random_r random_r.c:360 __random_r random_r.c:360
__random_r random_r.c:388 __random_r random_r.c:388
__random_r random_r.c:388 __random_r random_r.c:388
__random_r random_r.c:380 __random_r random_r.c:380
[ Hot streams in old perf data only ]
hot chain 1:
cycles: 18, hits: 6.75%
--------------------------
__random_r random_r.c:360
__random_r random_r.c:388
__random_r random_r.c:388
__random_r random_r.c:380
__random_r random_r.c:357
__random random.c:293
__random random.c:293
__random random.c:291
__random random.c:291
__random random.c:291
__random random.c:288
rand rand.c:27
rand rand.c:26
rand@plt
rand@plt
compute_flag div.c:25
compute_flag div.c:22
main div.c:40
hot chain 2:
cycles: 29, hits: 2.78%
--------------------------
compute_flag div.c:22
main div.c:40
main div.c:40
main div.c:39
[ Hot streams in new perf data only ]
hot chain 1:
cycles: 4, hits: 4.54%
--------------------------
main div.c:42
compute_flag div.c:28
hot chain 2:
cycles: 5, hits: 3.51%
--------------------------
main div.c:39
main div.c:44
main div.c:42
compute_flag div.c:28
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
v8:
- No change
v7:
- Use new struct evlist_streams in data__file.
- Free the streams in data__free.
v6:
- Rebase to perf/core
v5:
- Remove enum stream_type
- Rebase to perf/core
v4:
- Remove the "--before" and "--after" options since they are for
source line based comparison. In this patchset, we will not
support source line based comparison.
tools/perf/Documentation/perf-diff.txt | 4 +
tools/perf/builtin-diff.c | 119 ++++++++++++++++++++++---
2 files changed, 110 insertions(+), 13 deletions(-)
diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index f50ca0fef0a4..be65bd55ab2a 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -182,6 +182,10 @@ OPTIONS
--tid=::
Only diff samples for given thread ID (comma separated list).
+--stream::
+ Enable hot streams comparison. Stream can be a callchain which is
+ aggregated by the branch records from samples.
+
COMPARISON
----------
The comparison is governed by the baseline file. The baseline perf.data
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index f8c9bdd8269a..584e2e1a3793 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -25,6 +25,7 @@
#include "util/map.h"
#include "util/spark.h"
#include "util/block-info.h"
+#include "util/stream.h"
#include <linux/err.h>
#include <linux/zalloc.h>
#include <subcmd/pager.h>
@@ -42,6 +43,7 @@ struct perf_diff {
int range_size;
int range_num;
bool has_br_stack;
+ bool stream;
};
/* Diff command specific HPP columns. */
@@ -72,6 +74,7 @@ struct data__file {
struct perf_data data;
int idx;
struct hists *hists;
+ struct evlist_streams *evlist_streams;
struct diff_hpp_fmt fmt[PERF_HPP_DIFF__MAX_INDEX];
};
@@ -106,6 +109,7 @@ enum {
COMPUTE_DELTA_ABS,
COMPUTE_CYCLES,
COMPUTE_MAX,
+ COMPUTE_STREAM, /* After COMPUTE_MAX to avoid use current compute arrays */
};
const char *compute_names[COMPUTE_MAX] = {
@@ -393,6 +397,11 @@ static int diff__process_sample_event(struct perf_tool *tool,
struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
struct addr_location al;
struct hists *hists = evsel__hists(evsel);
+ struct hist_entry_iter iter = {
+ .evsel = evsel,
+ .sample = sample,
+ .ops = &hist_iter_normal,
+ };
int ret = -1;
if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
@@ -411,14 +420,8 @@ static int diff__process_sample_event(struct perf_tool *tool,
goto out_put;
}
- if (compute != COMPUTE_CYCLES) {
- if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
- true)) {
- pr_warning("problem incrementing symbol period, "
- "skipping event\n");
- goto out_put;
- }
- } else {
+ switch (compute) {
+ case COMPUTE_CYCLES:
if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
NULL, NULL, sample, true)) {
pr_warning("problem incrementing symbol period, "
@@ -428,6 +431,23 @@ static int diff__process_sample_event(struct perf_tool *tool,
hist__account_cycles(sample->branch_stack, &al, sample, false,
NULL);
+ break;
+
+ case COMPUTE_STREAM:
+ if (hist_entry_iter__add(&iter, &al, PERF_MAX_STACK_DEPTH,
+ NULL)) {
+ pr_debug("problem adding hist entry, skipping event\n");
+ goto out_put;
+ }
+ break;
+
+ default:
+ if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
+ true)) {
+ pr_warning("problem incrementing symbol period, "
+ "skipping event\n");
+ goto out_put;
+ }
}
/*
@@ -996,10 +1016,55 @@ static void data_process(void)
}
}
+static int process_base_stream(struct data__file *data_base,
+ struct data__file *data_pair,
+ const char *title __maybe_unused)
+{
+ struct evlist *evlist_base = data_base->session->evlist;
+ struct evlist *evlist_pair = data_pair->session->evlist;
+ struct evsel *evsel_base, *evsel_pair;
+ struct evsel_streams *es_base, *es_pair;
+
+ evlist__for_each_entry(evlist_base, evsel_base) {
+ evsel_pair = evsel_match(evsel_base, evlist_pair);
+ if (!evsel_pair)
+ continue;
+
+ es_base = evsel_streams__entry(data_base->evlist_streams,
+ evsel_base->idx);
+ if (!es_base)
+ return -1;
+
+ es_pair = evsel_streams__entry(data_pair->evlist_streams,
+ evsel_pair->idx);
+ if (!es_pair)
+ return -1;
+
+ evsel_streams__match(es_base, es_pair);
+ evsel_streams__report(es_base, es_pair);
+ }
+
+ return 0;
+}
+
+static void stream_process(void)
+{
+ /*
+ * Stream comparison only supports two data files.
+ * perf.data.old and perf.data. data__files[0] is perf.data.old,
+ * data__files[1] is perf.data.
+ */
+ process_base_stream(&data__files[0], &data__files[1],
+ "# Output based on old perf data:\n#\n");
+}
+
static void data__free(struct data__file *d)
{
int col;
+ if (d->evlist_streams)
+ evlist_streams__delete(d->evlist_streams);
+
for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
struct diff_hpp_fmt *fmt = &d->fmt[col];
@@ -1153,9 +1218,19 @@ static int __cmd_diff(void)
if (pdiff.ptime_range)
zfree(&pdiff.ptime_range);
+
+ if (compute == COMPUTE_STREAM) {
+ d->evlist_streams = evlist__create_streams(
+ d->session->evlist, 5);
+ if (!d->evlist_streams)
+ goto out_delete;
+ }
}
- data_process();
+ if (compute == COMPUTE_STREAM)
+ stream_process();
+ else
+ data_process();
out_delete:
data__for_each_file(i, d) {
@@ -1228,6 +1303,8 @@ static const struct option options[] = {
"only consider symbols in these pids"),
OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
"only consider symbols in these tids"),
+ OPT_BOOLEAN(0, "stream", &pdiff.stream,
+ "Enable hot streams comparison."),
OPT_END()
};
@@ -1887,6 +1964,9 @@ int cmd_diff(int argc, const char **argv)
if (cycles_hist && (compute != COMPUTE_CYCLES))
usage_with_options(diff_usage, options);
+ if (pdiff.stream)
+ compute = COMPUTE_STREAM;
+
symbol__annotation_init();
if (symbol__init(NULL) < 0)
@@ -1898,13 +1978,26 @@ int cmd_diff(int argc, const char **argv)
if (check_file_brstack() < 0)
return -1;
- if (compute == COMPUTE_CYCLES && !pdiff.has_br_stack)
+ if ((compute == COMPUTE_CYCLES || compute == COMPUTE_STREAM)
+ && !pdiff.has_br_stack) {
return -1;
+ }
- if (ui_init() < 0)
- return -1;
+ if (compute == COMPUTE_STREAM) {
+ symbol_conf.show_branchflag_count = true;
+ symbol_conf.disable_add2line_warn = true;
+ callchain_param.mode = CHAIN_FLAT;
+ callchain_param.key = CCKEY_SRCLINE;
+ callchain_param.branch_callstack = 1;
+ symbol_conf.use_callchain = true;
+ callchain_register_param(&callchain_param);
+ sort_order = "srcline,symbol,dso";
+ } else {
+ if (ui_init() < 0)
+ return -1;
- sort__mode = SORT_MODE__DIFF;
+ sort__mode = SORT_MODE__DIFF;
+ }
if (setup_sorting(NULL) < 0)
usage_with_options(diff_usage, options);
--
2.17.1
^ permalink raw reply related [flat|nested] 9+ messages in thread* Re: [PATCH v8 0/7] perf: Stream comparison
2020-10-09 2:28 [PATCH v8 0/7] perf: Stream comparison Jin Yao
` (6 preceding siblings ...)
2020-10-09 2:28 ` [PATCH v8 7/7] perf diff: Support hot streams comparison Jin Yao
@ 2020-10-13 4:25 ` Jin, Yao
7 siblings, 0 replies; 9+ messages in thread
From: Jin, Yao @ 2020-10-13 4:25 UTC (permalink / raw)
To: acme, jolsa, peterz, mingo, alexander.shishkin
Cc: Linux-kernel, ak, kan.liang, yao.jin
Hi Jiri, Hi Arnaldo,
How about v8 series? V6 got ACK from Jiri and I updated the series to v8 according to Arnaldo's
comments. Please let me know if there are still some issues for this version then I can continue
improving the patchset.
Thanks
Jin Yao
On 10/9/2020 10:28 AM, Jin Yao wrote:
> Sometimes, a small change in a hot function reducing the cycles of
> this function, but the overall workload doesn't get faster. It is
> interesting where the cycles are moved to.
>
> What it would like is to diff before/after streams. The stream is the
> branch history which is aggregated by the branch records from perf
> samples. For example, the callchains aggregated from the branch records.
> By browsing the hot stream, we can understand the hot code path.
>
> By browsing the hot streams, we can understand the hot code path.
> By comparing the cycles variation of same streams between old perf
> data and new perf data, we can understand if the cycles are moved
> to other codes.
>
> The before stream is the stream in perf.data.old. The after stream
> is the stream in perf.data.
>
> Diffing before/after streams compares top N hottest streams between
> two perf data files.
>
> If all entries of one stream in perf.data.old are fully matched with
> all entries of another stream in perf.data, we think two streams
> are matched, otherwise the streams are not matched.
>
> For example,
>
> cycles: 1, hits: 26.80% cycles: 1, hits: 27.30%
> -------------------------- --------------------------
> main div.c:39 main div.c:39
> main div.c:44 main div.c:44
>
> The above streams are matched and we can see for the same streams the
> cycles (1) are equal and the callchain hit percents are slightly changed
> (26.80% vs. 27.30%). That's expected.
>
> Now let's see example.
>
> perf record -b ... Generate perf.data.old with branch data
> perf record -b ... Generate perf.data with branch data
> perf diff --stream
>
> [ Matched hot streams ]
>
> hot chain pair 1:
> cycles: 1, hits: 27.77% cycles: 1, hits: 9.24%
> --------------------------- --------------------------
> main div.c:39 main div.c:39
> main div.c:44 main div.c:44
>
> hot chain pair 2:
> cycles: 34, hits: 20.06% cycles: 27, hits: 16.98%
> --------------------------- --------------------------
> __random_r random_r.c:360 __random_r random_r.c:360
> __random_r random_r.c:388 __random_r random_r.c:388
> __random_r random_r.c:388 __random_r random_r.c:388
> __random_r random_r.c:380 __random_r random_r.c:380
> __random_r random_r.c:357 __random_r random_r.c:357
> __random random.c:293 __random random.c:293
> __random random.c:293 __random random.c:293
> __random random.c:291 __random random.c:291
> __random random.c:291 __random random.c:291
> __random random.c:291 __random random.c:291
> __random random.c:288 __random random.c:288
> rand rand.c:27 rand rand.c:27
> rand rand.c:26 rand rand.c:26
> rand@plt rand@plt
> rand@plt rand@plt
> compute_flag div.c:25 compute_flag div.c:25
> compute_flag div.c:22 compute_flag div.c:22
> main div.c:40 main div.c:40
> main div.c:40 main div.c:40
> main div.c:39 main div.c:39
>
> hot chain pair 3:
> cycles: 9, hits: 4.48% cycles: 6, hits: 4.51%
> --------------------------- --------------------------
> __random_r random_r.c:360 __random_r random_r.c:360
> __random_r random_r.c:388 __random_r random_r.c:388
> __random_r random_r.c:388 __random_r random_r.c:388
> __random_r random_r.c:380 __random_r random_r.c:380
>
> [ Hot streams in old perf data only ]
>
> hot chain 1:
> cycles: 18, hits: 6.75%
> --------------------------
> __random_r random_r.c:360
> __random_r random_r.c:388
> __random_r random_r.c:388
> __random_r random_r.c:380
> __random_r random_r.c:357
> __random random.c:293
> __random random.c:293
> __random random.c:291
> __random random.c:291
> __random random.c:291
> __random random.c:288
> rand rand.c:27
> rand rand.c:26
> rand@plt
> rand@plt
> compute_flag div.c:25
> compute_flag div.c:22
> main div.c:40
>
> hot chain 2:
> cycles: 29, hits: 2.78%
> --------------------------
> compute_flag div.c:22
> main div.c:40
> main div.c:40
> main div.c:39
>
> [ Hot streams in new perf data only ]
>
> hot chain 1:
> cycles: 4, hits: 4.54%
> --------------------------
> main div.c:42
> compute_flag div.c:28
>
> hot chain 2:
> cycles: 5, hits: 3.51%
> --------------------------
> main div.c:39
> main div.c:44
> main div.c:42
> compute_flag div.c:28
>
> v8:
> ---
> Rebase to perf/core
>
> v7:
> ---
> Create a new struct evlist_streams which contains ev_streams and
> nr_evsel, so we don't need to pass nr_evsel in stream related functions.
>
> Rename functions for better coding style.
>
> v6:
> ---
> Rebase to perf/core
>
> v5:
> ---
> 1. Remove enum stream_type
> 2. Rebase to perf/core
>
> v4:
> ---
> The previous version is too big and very hard for review.
>
> 1. v4 removes the code which supports the source line mapping
> table and remove the source line based comparison. Now we
> only supports the basic functionality of stream comparison.
>
> 2. Refactor the code in a generic way.
>
> v3:
> ---
> v2 has 14 patches, it's hard to review.
> v3 is only 7 patches for basic stream comparison.
>
> Jin Yao (7):
> perf util: Create streams
> perf util: Get the evsel_streams by evsel_idx
> perf util: Compare two streams
> perf util: Link stream pair
> perf util: Calculate the sum of total streams hits
> perf util: Report hot streams
> perf diff: Support hot streams comparison
>
> tools/perf/Documentation/perf-diff.txt | 4 +
> tools/perf/builtin-diff.c | 119 ++++++++-
> tools/perf/util/Build | 1 +
> tools/perf/util/callchain.c | 99 +++++++
> tools/perf/util/callchain.h | 9 +
> tools/perf/util/stream.c | 342 +++++++++++++++++++++++++
> tools/perf/util/stream.h | 41 +++
> 7 files changed, 602 insertions(+), 13 deletions(-)
> create mode 100644 tools/perf/util/stream.c
> create mode 100644 tools/perf/util/stream.h
>
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