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Subject[PATCH 3/6] perf kmem: Add --live option for current allocation stat
Date
Currently perf kmem shows total (page) allocation stat by default, but
sometimes one might want to see live (total alloc-only) requests/pages
only. The new --live option does this by subtracting freed allocation
from the stat.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/Documentation/perf-kmem.txt | 5 ++
tools/perf/builtin-kmem.c | 110 ++++++++++++++++++++-------------
2 files changed, 73 insertions(+), 42 deletions(-)

diff --git a/tools/perf/Documentation/perf-kmem.txt b/tools/perf/Documentation/perf-kmem.txt
index 69e181272c51..ff0f433b3fce 100644
--- a/tools/perf/Documentation/perf-kmem.txt
+++ b/tools/perf/Documentation/perf-kmem.txt
@@ -56,6 +56,11 @@ OPTIONS
--page::
Analyze page allocator events

+--live::
+ Show live page stat. The perf kmem shows total allocation stat by
+ default, but this option shows live (currently allocated) pages
+ instead. (This option works with --page option only)
+
SEE ALSO
--------
linkperf:perf-record[1]
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index a9dd73f2a5d9..44a100caa172 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -244,6 +244,7 @@ static unsigned long nr_page_fails;
static unsigned long nr_page_nomatch;

static bool use_pfn;
+static bool live_page;
static struct perf_session *kmem_session;

#define MAX_MIGRATE_TYPES 6
@@ -264,7 +265,7 @@ struct page_stat {
int nr_free;
};

-static struct rb_root page_tree;
+static struct rb_root page_live_tree;
static struct rb_root page_alloc_tree;
static struct rb_root page_alloc_sorted;
static struct rb_root page_caller_tree;
@@ -403,10 +404,19 @@ static u64 find_callsite(struct perf_evsel *evsel, struct perf_sample *sample)
return sample->ip;
}

+struct sort_dimension {
+ const char name[20];
+ sort_fn_t cmp;
+ struct list_head list;
+};
+
+static LIST_HEAD(page_alloc_sort_input);
+static LIST_HEAD(page_caller_sort_input);
+
static struct page_stat *
-__page_stat__findnew_page(u64 page, bool create)
+__page_stat__findnew_page(struct page_stat *this, bool create)
{
- struct rb_node **node = &page_tree.rb_node;
+ struct rb_node **node = &page_live_tree.rb_node;
struct rb_node *parent = NULL;
struct page_stat *data;

@@ -416,7 +426,7 @@ __page_stat__findnew_page(u64 page, bool create)
parent = *node;
data = rb_entry(*node, struct page_stat, node);

- cmp = data->page - page;
+ cmp = data->page - this->page;
if (cmp < 0)
node = &parent->rb_left;
else if (cmp > 0)
@@ -430,34 +440,28 @@ __page_stat__findnew_page(u64 page, bool create)

data = zalloc(sizeof(*data));
if (data != NULL) {
- data->page = page;
+ data->page = this->page;
+ data->order = this->order;
+ data->migrate_type = this->migrate_type;
+ data->gfp_flags = this->gfp_flags;

rb_link_node(&data->node, parent, node);
- rb_insert_color(&data->node, &page_tree);
+ rb_insert_color(&data->node, &page_live_tree);
}

return data;
}

-static struct page_stat *page_stat__find_page(u64 page)
+static struct page_stat *page_stat__find_page(struct page_stat *stat)
{
- return __page_stat__findnew_page(page, false);
+ return __page_stat__findnew_page(stat, false);
}

-static struct page_stat *page_stat__findnew_page(u64 page)
+static struct page_stat *page_stat__findnew_page(struct page_stat *stat)
{
- return __page_stat__findnew_page(page, true);
+ return __page_stat__findnew_page(stat, true);
}

-struct sort_dimension {
- const char name[20];
- sort_fn_t cmp;
- struct list_head list;
-};
-
-static LIST_HEAD(page_alloc_sort_input);
-static LIST_HEAD(page_caller_sort_input);
-
static struct page_stat *
__page_stat__findnew_alloc(struct page_stat *this, bool create)
{
@@ -615,17 +619,8 @@ static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
* This is to find the current page (with correct gfp flags and
* migrate type) at free event.
*/
- stat = page_stat__findnew_page(page);
- if (stat == NULL)
- return -ENOMEM;
-
- stat->order = order;
- stat->gfp_flags = gfp_flags;
- stat->migrate_type = migrate_type;
- stat->callsite = callsite;
-
this.page = page;
- stat = page_stat__findnew_alloc(&this);
+ stat = page_stat__findnew_page(&this);
if (stat == NULL)
return -ENOMEM;

@@ -633,6 +628,16 @@ static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
stat->alloc_bytes += bytes;
stat->callsite = callsite;

+ if (!live_page) {
+ stat = page_stat__findnew_alloc(&this);
+ if (stat == NULL)
+ return -ENOMEM;
+
+ stat->nr_alloc++;
+ stat->alloc_bytes += bytes;
+ stat->callsite = callsite;
+ }
+
this.callsite = callsite;
stat = page_stat__findnew_caller(&this);
if (stat == NULL)
@@ -665,7 +670,8 @@ static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
nr_page_frees++;
total_page_free_bytes += bytes;

- stat = page_stat__find_page(page);
+ this.page = page;
+ stat = page_stat__find_page(&this);
if (stat == NULL) {
pr_debug2("missing free at page %"PRIx64" (order: %d)\n",
page, order);
@@ -676,20 +682,23 @@ static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
return 0;
}

- this.page = page;
this.gfp_flags = stat->gfp_flags;
this.migrate_type = stat->migrate_type;
this.callsite = stat->callsite;

- rb_erase(&stat->node, &page_tree);
+ rb_erase(&stat->node, &page_live_tree);
free(stat);

- stat = page_stat__find_alloc(&this);
- if (stat == NULL)
- return -ENOENT;
+ if (live_page) {
+ order_stats[this.order][this.migrate_type]--;
+ } else {
+ stat = page_stat__find_alloc(&this);
+ if (stat == NULL)
+ return -ENOMEM;

- stat->nr_free++;
- stat->free_bytes += bytes;
+ stat->nr_free++;
+ stat->free_bytes += bytes;
+ }

stat = page_stat__find_caller(&this);
if (stat == NULL)
@@ -698,6 +707,16 @@ static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
stat->nr_free++;
stat->free_bytes += bytes;

+ if (live_page) {
+ stat->nr_alloc--;
+ stat->alloc_bytes -= bytes;
+
+ if (stat->nr_alloc == 0) {
+ rb_erase(&stat->node, &page_caller_tree);
+ free(stat);
+ }
+ }
+
return 0;
}

@@ -815,8 +834,8 @@ static void __print_page_alloc_result(struct perf_session *session, int n_lines)
const char *format;

printf("\n%.105s\n", graph_dotted_line);
- printf(" %-16s | Total alloc (KB) | Hits | Order | Mig.type | GFP flags | Callsite\n",
- use_pfn ? "PFN" : "Page");
+ printf(" %-16s | %5s alloc (KB) | Hits | Order | Mig.type | GFP flags | Callsite\n",
+ use_pfn ? "PFN" : "Page", live_page ? "Live" : "Total");
printf("%.105s\n", graph_dotted_line);

if (use_pfn)
@@ -860,7 +879,8 @@ static void __print_page_caller_result(struct perf_session *session, int n_lines
struct machine *machine = &session->machines.host;

printf("\n%.105s\n", graph_dotted_line);
- printf(" Total alloc (KB) | Hits | Order | Mig.type | GFP flags | Callsite\n");
+ printf(" %5s alloc (KB) | Hits | Order | Mig.type | GFP flags | Callsite\n",
+ live_page ? "Live" : "Total");
printf("%.105s\n", graph_dotted_line);

while (next && n_lines--) {
@@ -1085,8 +1105,13 @@ static void sort_result(void)
&slab_caller_sort);
}
if (kmem_page) {
- __sort_page_result(&page_alloc_tree, &page_alloc_sorted,
- &page_alloc_sort);
+ if (live_page)
+ __sort_page_result(&page_live_tree, &page_alloc_sorted,
+ &page_alloc_sort);
+ else
+ __sort_page_result(&page_alloc_tree, &page_alloc_sorted,
+ &page_alloc_sort);
+
__sort_page_result(&page_caller_tree, &page_caller_sorted,
&page_caller_sort);
}
@@ -1630,6 +1655,7 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
parse_slab_opt),
OPT_CALLBACK_NOOPT(0, "page", NULL, NULL, "Analyze page allocator",
parse_page_opt),
+ OPT_BOOLEAN(0, "live", &live_page, "Show live page stat"),
OPT_END()
};
const char *const kmem_subcommands[] = { "record", "stat", NULL };
--
2.3.4


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