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Subject[PATCH 4/5] perf kmem: Measure kmalloc/kfree CPU ping-pong call-sites
Show statistics for allocations and frees on different cpus:

------------------------------------------------------------------------------------------------------
Callsite | Total_alloc/Per | Total_req/Per | Hit | Ping-pong | Frag
------------------------------------------------------------------------------------------------------
perf_event_alloc.clone.0+0 | 7504/682 | 7128/648 | 11 | 0 | 5.011%
alloc_buffer_head+16 | 288/57 | 280/56 | 5 | 0 | 2.778%
radix_tree_preload+51 | 296/296 | 288/288 | 1 | 0 | 2.703%
tracepoint_add_probe+32e | 157/31 | 154/30 | 5 | 0 | 1.911%
do_maps_open+0 | 796/12 | 792/12 | 66 | 0 | 0.503%
sock_alloc_send_pskb+16e | 23780/495 | 23744/494 | 48 | 38 | 0.151%
anon_vma_prepare+9a | 3744/44 | 3740/44 | 85 | 0 | 0.107%
d_alloc+21 | 64948/164 | 64944/164 | 396 | 0 | 0.006%
proc_alloc_inode+23 | 262292/676 | 262288/676 | 388 | 0 | 0.002%
create_object+28 | 459600/200 | 459600/200 | 2298 | 71 | 0.000%
journal_start+67 | 14440/40 | 14440/40 | 361 | 0 | 0.000%
get_empty_filp+df | 53504/256 | 53504/256 | 209 | 0 | 0.000%
getname+2a | 823296/4096 | 823296/4096 | 201 | 0 | 0.000%
seq_read+2b0 | 544768/4096 | 544768/4096 | 133 | 0 | 0.000%
seq_open+6d | 17024/128 | 17024/128 | 133 | 0 | 0.000%
mmap_region+2e6 | 11704/88 | 11704/88 | 133 | 0 | 0.000%
single_open+0 | 1072/16 | 1072/16 | 67 | 0 | 0.000%
__alloc_skb+2e | 12544/256 | 12544/256 | 49 | 38 | 0.000%
__sigqueue_alloc+4a | 1296/144 | 1296/144 | 9 | 8 | 0.000%
tracepoint_add_probe+6f | 80/16 | 80/16 | 5 | 0 | 0.000%
------------------------------------------------------------------------------------------------------
...
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
tools/perf/builtin-kmem.c | 122 ++++++++++++++++++++++++++++++++++----------
1 files changed, 94 insertions(+), 28 deletions(-)
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 1ecf3f4..173d6db 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -40,13 +40,14 @@ static int *cpunode_map;
static int max_cpu_num;

struct alloc_stat {
- union {
- u64 call_site;
- u64 ptr;
- };
+ u64 call_site;
+ u64 ptr;
u64 bytes_req;
u64 bytes_alloc;
u32 hit;
+ u32 pingpong;
+
+ short alloc_cpu;

struct rb_node node;
};
@@ -144,16 +145,13 @@ process_comm_event(event_t *event, unsigned long offset, unsigned long head)
return 0;
}

-static void insert_alloc_stat(unsigned long ptr,
- int bytes_req, int bytes_alloc)
+static void insert_alloc_stat(unsigned long call_site, unsigned long ptr,
+ int bytes_req, int bytes_alloc, int cpu)
{
struct rb_node **node = &root_alloc_stat.rb_node;
struct rb_node *parent = NULL;
struct alloc_stat *data = NULL;

- if (!alloc_flag)
- return;
-
while (*node) {
parent = *node;
data = rb_entry(*node, struct alloc_stat, node);
@@ -172,7 +170,10 @@ static void insert_alloc_stat(unsigned long ptr,
data->bytes_alloc += bytes_req;
} else {
data = malloc(sizeof(*data));
+ if (!data)
+ die("malloc");
data->ptr = ptr;
+ data->pingpong = 0;
data->hit = 1;
data->bytes_req = bytes_req;
data->bytes_alloc = bytes_alloc;
@@ -180,6 +181,8 @@ static void insert_alloc_stat(unsigned long ptr,
rb_link_node(&data->node, parent, node);
rb_insert_color(&data->node, &root_alloc_stat);
}
+ data->call_site = call_site;
+ data->alloc_cpu = cpu;
}

static void insert_caller_stat(unsigned long call_site,
@@ -189,9 +192,6 @@ static void insert_caller_stat(unsigned long call_site,
struct rb_node *parent = NULL;
struct alloc_stat *data = NULL;

- if (!caller_flag)
- return;
-
while (*node) {
parent = *node;
data = rb_entry(*node, struct alloc_stat, node);
@@ -210,7 +210,10 @@ static void insert_caller_stat(unsigned long call_site,
data->bytes_alloc += bytes_req;
} else {
data = malloc(sizeof(*data));
+ if (!data)
+ die("malloc");
data->call_site = call_site;
+ data->pingpong = 0;
data->hit = 1;
data->bytes_req = bytes_req;
data->bytes_alloc = bytes_alloc;
@@ -238,7 +241,7 @@ static void process_alloc_event(struct raw_event_sample *raw,
bytes_req = raw_field_value(event, "bytes_req", raw->data);
bytes_alloc = raw_field_value(event, "bytes_alloc", raw->data);

- insert_alloc_stat(ptr, bytes_req, bytes_alloc);
+ insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, cpu);
insert_caller_stat(call_site, bytes_req, bytes_alloc);

total_requested += bytes_req;
@@ -253,12 +256,58 @@ static void process_alloc_event(struct raw_event_sample *raw,
nr_allocs++;
}

-static void process_free_event(struct raw_event_sample *raw __used,
- struct event *event __used,
- int cpu __used,
+static int ptr_cmp(struct alloc_stat *, struct alloc_stat *);
+static int callsite_cmp(struct alloc_stat *, struct alloc_stat *);
+
+static struct alloc_stat *search_alloc_stat(unsigned long ptr,
+ unsigned long call_site,
+ struct rb_root *root,
+ sort_fn_t sort_fn)
+{
+ struct rb_node *node = root->rb_node;
+ struct alloc_stat key = { .ptr = ptr, .call_site = call_site };
+
+ while (node) {
+ struct alloc_stat *data;
+ int cmp;
+
+ data = rb_entry(node, struct alloc_stat, node);
+
+ cmp = sort_fn(&key, data);
+ if (cmp < 0)
+ node = node->rb_left;
+ else if (cmp > 0)
+ node = node->rb_right;
+ else
+ return data;
+ }
+ return NULL;
+}
+
+static void process_free_event(struct raw_event_sample *raw,
+ struct event *event,
+ int cpu,
u64 timestamp __used,
struct thread *thread __used)
{
+ unsigned long ptr;
+ struct alloc_stat *s_alloc, *s_caller;
+
+ ptr = raw_field_value(event, "ptr", raw->data);
+
+ s_alloc = search_alloc_stat(ptr, 0, &root_alloc_stat, ptr_cmp);
+ if (!s_alloc)
+ return;
+
+ if (cpu != s_alloc->alloc_cpu) {
+ s_alloc->pingpong++;
+
+ s_caller = search_alloc_stat(0, s_alloc->call_site,
+ &root_caller_stat, callsite_cmp);
+ assert(s_caller);
+ s_caller->pingpong++;
+ }
+ s_alloc->alloc_cpu = -1;
}

static void
@@ -379,10 +428,10 @@ static void __print_result(struct rb_root *root, int n_lines, int is_caller)
{
struct rb_node *next;

- printf("%.78s\n", graph_dotted_line);
- printf("%-28s|", is_caller ? "Callsite": "Alloc Ptr");
- printf("Total_alloc/Per | Total_req/Per | Hit | Frag\n");
- printf("%.78s\n", graph_dotted_line);
+ printf("%.102s\n", graph_dotted_line);
+ printf(" %-34s |", is_caller ? "Callsite": "Alloc Ptr");
+ printf(" Total_alloc/Per | Total_req/Per | Hit | Ping-pong | Frag\n");
+ printf("%.102s\n", graph_dotted_line);

next = rb_first(root);

@@ -390,7 +439,7 @@ static void __print_result(struct rb_root *root, int n_lines, int is_caller)
struct alloc_stat *data = rb_entry(next, struct alloc_stat,
node);
struct symbol *sym = NULL;
- char bf[BUFSIZ];
+ char buf[BUFSIZ];
u64 addr;

if (is_caller) {
@@ -402,26 +451,28 @@ static void __print_result(struct rb_root *root, int n_lines, int is_caller)
addr = data->ptr;

if (sym != NULL)
- snprintf(bf, sizeof(bf), "%s+%Lx", sym->name,
+ snprintf(buf, sizeof(buf), "%s+%Lx", sym->name,
addr - sym->start);
else
- snprintf(bf, sizeof(bf), "%#Lx", addr);
+ snprintf(buf, sizeof(buf), "%#Lx", addr);
+ printf(" %-34s |", buf);

- printf("%-28s|%8llu/%-6lu |%8llu/%-6lu|%6lu|%8.3f%%\n",
- bf, (unsigned long long)data->bytes_alloc,
+ printf(" %9llu/%-5lu | %9llu/%-5lu | %6lu | %8lu | %6.3f%%\n",
+ (unsigned long long)data->bytes_alloc,
(unsigned long)data->bytes_alloc / data->hit,
(unsigned long long)data->bytes_req,
(unsigned long)data->bytes_req / data->hit,
(unsigned long)data->hit,
+ (unsigned long)data->pingpong,
fragmentation(data->bytes_req, data->bytes_alloc));

next = rb_next(next);
}

if (n_lines == -1)
- printf(" ... | ... | ... | ... | ... \n");
+ printf(" ... | ... | ... | ... | ... | ... \n");

- printf("%.78s\n", graph_dotted_line);
+ printf("%.102s\n", graph_dotted_line);
}

static void print_summary(void)
@@ -597,12 +648,27 @@ static struct sort_dimension frag_sort_dimension = {
.cmp = frag_cmp,
};

+static int pingpong_cmp(struct alloc_stat *l, struct alloc_stat *r)
+{
+ if (l->pingpong < r->pingpong)
+ return -1;
+ else if (l->pingpong > r->pingpong)
+ return 1;
+ return 0;
+}
+
+static struct sort_dimension pingpong_sort_dimension = {
+ .name = "pingpong",
+ .cmp = pingpong_cmp,
+};
+
static struct sort_dimension *avail_sorts[] = {
&ptr_sort_dimension,
&callsite_sort_dimension,
&hit_sort_dimension,
&bytes_sort_dimension,
&frag_sort_dimension,
+ &pingpong_sort_dimension,
};

#define NUM_AVAIL_SORTS \
@@ -703,7 +769,7 @@ static const struct option kmem_options[] = {
"stat selector, Pass 'alloc' or 'caller'.",
parse_stat_opt),
OPT_CALLBACK('s', "sort", NULL, "key[,key2...]",
- "sort by key(s): ptr, call_site, bytes, hit, frag",
+ "sort by keys: ptr, call_site, bytes, hit, pingpong, frag",
parse_sort_opt),
OPT_CALLBACK('l', "line", NULL, "num",
"show n lins",
--
1.6.3


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