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Subject[PATCH 06/10] perf report: Add 'cgroup' sort key
Date
The cgroup sort key is to show cgroup membership of each task.
Currently it shows full path in the cgroupfs (not relative to the root
of cgroup namespace) since it'd be more intuitive IMHO. Otherwise
root cgroup in different namespaces will all show same name - "/".

The cgroup sort key should come before cgroup_id otherwise
sort_dimension__add() will match it to cgroup_id as it only matches
with the given substring.

For example it will look like following. Note that record patch
adding --all-cgroups patch will come later.

$ perf record -a --namespace --all-cgroups cgtest
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.208 MB perf.data (4090 samples) ]

$ perf report -s cgroup_id,cgroup,pid
...
# Overhead cgroup id (dev/inode) cgroup Pid:Command
# ........ ..................... .......... ...............
#
93.96% 0/0x0 / 0:swapper
1.25% 3/0xeffffffb / 278:looper0
0.86% 3/0xf000015f /sub/cgrp1 280:cgtest
0.37% 3/0xf0000160 /sub/cgrp2 281:cgtest
0.34% 3/0xf0000163 /sub/cgrp3 282:cgtest
0.22% 3/0xeffffffb /sub 278:looper0
0.20% 3/0xeffffffb / 280:cgtest
0.15% 3/0xf0000163 /sub/cgrp3 285:looper3

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/Documentation/perf-report.txt | 1 +
tools/perf/util/hist.c | 12 ++++++++
tools/perf/util/hist.h | 1 +
tools/perf/util/sort.c | 37 ++++++++++++++++++++++++
tools/perf/util/sort.h | 2 ++
5 files changed, 53 insertions(+)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index db61f16ffa56..f6bb82752a5c 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -95,6 +95,7 @@ OPTIONS
abort cost. This is the global weight.
- local_weight: Local weight version of the weight above.
- cgroup_id: ID derived from cgroup namespace device and inode numbers.
+ - cgroup: cgroup pathname in the cgroupfs.
- transaction: Transaction abort flags.
- overhead: Overhead percentage of sample
- overhead_sys: Overhead percentage of sample running in system mode
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index ca5a8f4d007e..e0275d8808bd 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -10,6 +10,7 @@
#include "mem-events.h"
#include "session.h"
#include "namespaces.h"
+#include "cgroup.h"
#include "sort.h"
#include "units.h"
#include "evlist.h"
@@ -222,6 +223,16 @@ void hists__calc_col_len(struct hists *hists, struct hist_entry *h)

if (h->trace_output)
hists__new_col_len(hists, HISTC_TRACE, strlen(h->trace_output));
+
+ if (h->cgroup) {
+ const char *cgrp_name = "unknown";
+ struct cgroup *cgrp = cgroup__find(h->ms.maps->machine->env,
+ h->cgroup);
+ if (cgrp != NULL)
+ cgrp_name = cgrp->name;
+
+ hists__new_col_len(hists, HISTC_CGROUP, strlen(cgrp_name));
+ }
}

void hists__output_recalc_col_len(struct hists *hists, int max_rows)
@@ -691,6 +702,7 @@ __hists__add_entry(struct hists *hists,
.dev = ns ? ns->link_info[CGROUP_NS_INDEX].dev : 0,
.ino = ns ? ns->link_info[CGROUP_NS_INDEX].ino : 0,
},
+ .cgroup = sample->cgroup,
.ms = {
.maps = al->maps,
.map = al->map,
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 0aa63aeb58ec..f7fb9c32dda5 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -38,6 +38,7 @@ enum hist_column {
HISTC_THREAD,
HISTC_COMM,
HISTC_CGROUP_ID,
+ HISTC_CGROUP,
HISTC_PARENT,
HISTC_CPU,
HISTC_SOCKET,
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index ab0cfd790ad0..8bc8e55dd65e 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -12,6 +12,7 @@
#include "cacheline.h"
#include "comm.h"
#include "map.h"
+#include "maps.h"
#include "symbol.h"
#include "map_symbol.h"
#include "branch.h"
@@ -25,6 +26,8 @@
#include "mem-events.h"
#include "annotate.h"
#include "time-utils.h"
+#include "cgroup.h"
+#include "machine.h"
#include <linux/kernel.h>
#include <linux/string.h>

@@ -634,6 +637,39 @@ struct sort_entry sort_cgroup_id = {
.se_width_idx = HISTC_CGROUP_ID,
};

+/* --sort cgroup */
+
+static int64_t
+sort__cgroup_cmp(struct hist_entry *left, struct hist_entry *right)
+{
+ return right->cgroup - left->cgroup;
+}
+
+static int hist_entry__cgroup_snprintf(struct hist_entry *he,
+ char *bf, size_t size,
+ unsigned int width __maybe_unused)
+{
+ const char *cgrp_name = "N/A";
+
+ if (he->cgroup) {
+ struct cgroup *cgrp = cgroup__find(he->ms.maps->machine->env,
+ he->cgroup);
+ if (cgrp != NULL)
+ cgrp_name = cgrp->name;
+ else
+ cgrp_name = "unknown";
+ }
+
+ return repsep_snprintf(bf, size, "%s", cgrp_name);
+}
+
+struct sort_entry sort_cgroup = {
+ .se_header = "cgroup",
+ .se_cmp = sort__cgroup_cmp,
+ .se_snprintf = hist_entry__cgroup_snprintf,
+ .se_width_idx = HISTC_CGROUP,
+};
+
/* --sort socket */

static int64_t
@@ -1658,6 +1694,7 @@ static struct sort_dimension common_sort_dimensions[] = {
DIM(SORT_TRACE, "trace", sort_trace),
DIM(SORT_SYM_SIZE, "symbol_size", sort_sym_size),
DIM(SORT_DSO_SIZE, "dso_size", sort_dso_size),
+ DIM(SORT_CGROUP, "cgroup", sort_cgroup),
DIM(SORT_CGROUP_ID, "cgroup_id", sort_cgroup_id),
DIM(SORT_SYM_IPC_NULL, "ipc_null", sort_sym_ipc_null),
DIM(SORT_TIME, "time", sort_time),
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 6c862d62d052..cfa6ac6f7d06 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -101,6 +101,7 @@ struct hist_entry {
struct thread *thread;
struct comm *comm;
struct namespace_id cgroup_id;
+ u64 cgroup;
u64 ip;
u64 transaction;
s32 socket;
@@ -224,6 +225,7 @@ enum sort_type {
SORT_TRACE,
SORT_SYM_SIZE,
SORT_DSO_SIZE,
+ SORT_CGROUP,
SORT_CGROUP_ID,
SORT_SYM_IPC_NULL,
SORT_TIME,
--
2.25.0.265.gbab2e86ba0-goog
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