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Commit 079d3f65 authored by Li Zefan's avatar Li Zefan Committed by Ingo Molnar
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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: default avatarLi Zefan <lizf@cn.fujitsu.com>
Acked-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
LKML-Reference: <4B0B6E9F.6020309@cn.fujitsu.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 7d0d3945
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Inline Side-by-side
Showing with 94 additions and 28 deletions
tools/perf/builtin-kmem.c
View file @ 079d3f65
......@@ -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",
......
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