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Date: Mon, 23 Mar 2015 15:30:44 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Jiri Olsa <jolsa@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
David Ahern <dsahern@...il.com>,
Minchan Kim <minchan@...nel.org>,
Joonsoo Kim <js1304@...il.com>
Subject: [PATCH 5/5] perf kmem: Add --live option for current allocation stat
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@...nel.org>
---
tools/perf/Documentation/perf-kmem.txt | 5 ++
tools/perf/builtin-kmem.c | 101 ++++++++++++++++++++++++++++++---
2 files changed, 97 insertions(+), 9 deletions(-)
diff --git a/tools/perf/Documentation/perf-kmem.txt b/tools/perf/Documentation/perf-kmem.txt
index 0ebd9c8bfdbf..5a2d9aaf1933 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 fcd0e6f8fbdf..de82a1c579d9 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -243,6 +243,7 @@ static unsigned long nr_page_frees;
static unsigned long nr_page_fails;
static unsigned long nr_page_nomatch;
+static bool live_page;
static struct perf_session *kmem_session;
#define MAX_MIGRATE_TYPES 6
@@ -263,6 +264,7 @@ struct page_stat {
int nr_free;
};
+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;
@@ -405,6 +407,44 @@ struct sort_dimension {
static LIST_HEAD(page_alloc_sort_input);
static LIST_HEAD(page_caller_sort_input);
+static struct page_stat *search_page_live_stat(struct page_stat *this,
+ bool create)
+{
+ struct rb_node **node = &page_live_tree.rb_node;
+ struct rb_node *parent = NULL;
+ struct page_stat *data;
+
+ while (*node) {
+ s64 cmp;
+
+ parent = *node;
+ data = rb_entry(*node, struct page_stat, node);
+
+ cmp = data->page - this->page;
+ if (cmp < 0)
+ node = &parent->rb_left;
+ else if (cmp > 0)
+ node = &parent->rb_right;
+ else
+ return data;
+ }
+
+ if (!create)
+ return NULL;
+
+ data = zalloc(sizeof(*data));
+ if (data != NULL) {
+ 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_live_tree);
+ }
+
+ return data;
+}
static struct page_stat *search_page_alloc_stat(struct page_stat *this,
bool create)
{
@@ -523,11 +563,14 @@ static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
callsite = find_callsite(evsel, sample);
/*
+ * This is to find the current page (with correct gfp flags and
+ * migrate_type) at free event.
+ *
* XXX: We'd better to use PFN instead of page pointer to deal
* with things like partial freeing. But AFAIK there's no way
* to convert a pointer to struct page into PFN in userspace.
*/
- stat = search_page_alloc_stat(&this, true);
+ stat = search_page_live_stat(&this, true);
if (stat == NULL) {
pr_err("cannot create page alloc stat\n");
return -1;
@@ -537,6 +580,18 @@ static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
stat->alloc_bytes += bytes;
stat->callsite = callsite;
+ if (!live_page) {
+ stat = search_page_alloc_stat(&this, true);
+ if (stat == NULL) {
+ pr_err("cannot create page alloc stat\n");
+ return -1;
+ }
+
+ stat->nr_alloc++;
+ stat->alloc_bytes += bytes;
+ stat->callsite = callsite;
+ }
+
this.callsite = callsite;
stat = search_page_caller_stat(&this, true);
if (stat == NULL) {
@@ -572,7 +627,7 @@ static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
nr_page_frees++;
total_page_free_bytes += bytes;
- stat = search_page_alloc_stat(&this, false);
+ stat = search_page_live_stat(&this, false);
if (stat == NULL) {
pr_debug2("missing free at page %"PRIx64" (order: %d)\n",
page, order);
@@ -583,17 +638,37 @@ static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
return 0;
}
- stat->nr_free++;
- stat->free_bytes += bytes;
-
this.callsite = stat->callsite;
this.gfp_flags = stat->gfp_flags;
this.migrate_type = stat->migrate_type;
+ rb_erase(&stat->node, &page_live_tree);
+ free(stat);
+
+ if (live_page) {
+ order_stats[this.order][this.migrate_type]--;
+ } else {
+ stat = search_page_alloc_stat(&this, false);
+ if (stat != NULL) {
+ stat->nr_free++;
+ stat->free_bytes += bytes;
+ }
+ }
+
stat = search_page_caller_stat(&this, false);
if (stat != NULL) {
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;
@@ -712,7 +787,8 @@ static void __print_page_alloc_result(struct perf_session *session, int n_lines)
struct machine *machine = &session->machines.host;
printf("\n%.105s\n", graph_dotted_line);
- printf(" Page | Total alloc (KB) | Hits | Order | Migration type | GFP flags | Callsite\n");
+ printf(" Page | %5s alloc (KB) | Hits | Order | Migration type | GFP flags | Callsite\n",
+ live_page ? "Live" : "Total");
printf("%.105s\n", graph_dotted_line);
while (next && n_lines--) {
@@ -752,7 +828,8 @@ 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 | Migration type | GFP flags | Callsite\n");
+ printf(" %5s alloc (KB) | Hits | Order | Migration type | GFP flags | Callsite\n",
+ live_page ? "Live" : "Total");
printf("%.105s\n", graph_dotted_line);
while (next && n_lines--) {
@@ -977,8 +1054,13 @@ 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);
}
@@ -1509,6 +1591,7 @@ 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 };
--
2.3.3
--
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