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 <namhy...@kernel.org>
---
tools/perf/Documentation/perf-kmem.txt | 5 ++
tools/perf/builtin-kmem.c | 103 ++++++++++++++++++++-------------
2 files changed, 69 insertions(+), 39 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 2f9322b59140..c09e332f7f38 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;
@@ -398,10 +399,19 @@ 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 *search_page(u64 page, bool create)
+static struct page_stat *search_page_live_stat(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;
@@ -411,7 +421,7 @@ static struct page_stat *search_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)
@@ -425,24 +435,17 @@ static struct page_stat *search_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;
}
-
-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 *search_page_alloc_stat(struct page_stat *this,
bool create)
{
@@ -580,17 +583,8 @@ 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 = search_page(page, true);
- 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 = search_page_alloc_stat(&this, true);
+ stat = search_page_live_stat(&this, true);
if (stat == NULL)
return -ENOMEM;
@@ -598,6 +592,16 @@ 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)
+ return -ENOMEM;
+
+ stat->nr_alloc++;
+ stat->alloc_bytes += bytes;
+ stat->callsite = callsite;
+ }
+
this.callsite = callsite;
stat = search_page_caller_stat(&this, true);
if (stat == NULL)
@@ -630,7 +634,8 @@ static int perf_evsel__process_page_free_event(struct
perf_evsel *evsel,
nr_page_frees++;
total_page_free_bytes += bytes;
- stat = search_page(page, false);
+ this.page = page;
+ stat = search_page_live_stat(&this, false);
if (stat == NULL) {
pr_debug2("missing free at page %"PRIx64" (order: %d)\n",
page, order);
@@ -641,20 +646,23 @@ 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 = search_page_alloc_stat(&this, false);
- if (stat == NULL)
- return -ENOENT;
+ if (live_page) {
+ order_stats[this.order][this.migrate_type]--;
+ } else {
+ stat = search_page_alloc_stat(&this, false);
+ if (stat == NULL)
+ return -ENOMEM;
- stat->nr_free++;
- stat->free_bytes += bytes;
+ stat->nr_free++;
+ stat->free_bytes += bytes;
+ }
stat = search_page_caller_stat(&this, false);
if (stat == NULL)
@@ -663,6 +671,16 @@ 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;
}
@@ -780,8 +798,8 @@ 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 | Migration type
| GFP flags | Callsite\n",
- use_pfn ? "PFN" : "Page");
+ printf(" %-16s | %5s alloc (KB) | Hits | Order | Migration type |
GFP flags | Callsite\n",
+ use_pfn ? "PFN" : "Page", live_page ? "Live" : "Total");
printf("%.105s\n", graph_dotted_line);
if (use_pfn)
@@ -825,7 +843,8 @@ 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--) {
@@ -1050,8 +1069,13 @@ 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);
}
@@ -1591,6 +1615,7 @@ 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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