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perf kmem: Add --live option for current allocation stat
Currently 'perf kmem stat --page' 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.
E.g.:
# perf kmem stat --page
SUMMARY (page allocator)
========================
Total allocation requests : 988,858 [ 4,045,368 KB ]
Total free requests : 886,484 [ 3,624,996 KB ]
Total alloc+freed requests : 885,969 [ 3,622,628 KB ]
Total alloc-only requests : 102,889 [ 422,740 KB ]
Total free-only requests : 515 [ 2,368 KB ]
Total allocation failures : 0 [ 0 KB ]
Order Unmovable Reclaimable Movable Reserved CMA/Isolated
----- ------------ ------------ ------------ ------------ ------------
0 172,173 3,083 806,686 . .
1 284 . . . .
2 6,124 58 . . .
3 114 335 . . .
4 . . . . .
5 . . . . .
6 . . . . .
7 . . . . .
8 . . . . .
9 . . 1 . .
10 . . . . .
# perf kmem stat --page --live
SUMMARY (page allocator)
========================
Total allocation requests : 988,858 [ 4,045,368 KB ]
Total free requests : 886,484 [ 3,624,996 KB ]
Total alloc+freed requests : 885,969 [ 3,622,628 KB ]
Total alloc-only requests : 102,889 [ 422,740 KB ]
Total free-only requests : 515 [ 2,368 KB ]
Total allocation failures : 0 [ 0 KB ]
Order Unmovable Reclaimable Movable Reserved CMA/Isolated
----- ------------ ------------ ------------ ------------ ------------
0 2,214 3,025 97,156 . .
1 59 . . . .
2 19 58 . . .
3 23 335 . . .
4 . . . . .
5 . . . . .
6 . . . . .
7 . . . . .
8 . . . . .
9 . . . . .
10 . . . . .
#
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Pekka Enberg <penberg@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1429592107-1807-4-git-send-email-namhyung@kernel.org
[ Added examples to the changeset log ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
Arnaldo Carvalho de Melo
parent
fb4f313d30
commit
2a7ef02c9c
@ -56,6 +56,11 @@ OPTIONS
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--page::
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Analyze page allocator events
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--live::
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Show live page stat. The perf kmem shows total allocation stat by
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default, but this option shows live (currently allocated) pages
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instead. (This option works with --page option only)
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SEE ALSO
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--------
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linkperf:perf-record[1]
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@ -244,6 +244,7 @@ static unsigned long nr_page_fails;
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static unsigned long nr_page_nomatch;
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static bool use_pfn;
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static bool live_page;
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static struct perf_session *kmem_session;
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#define MAX_MIGRATE_TYPES 6
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@ -264,7 +265,7 @@ struct page_stat {
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int nr_free;
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};
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static struct rb_root page_tree;
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static struct rb_root page_live_tree;
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static struct rb_root page_alloc_tree;
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static struct rb_root page_alloc_sorted;
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static struct rb_root page_caller_tree;
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@ -403,10 +404,19 @@ out:
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return sample->ip;
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}
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struct sort_dimension {
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const char name[20];
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sort_fn_t cmp;
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struct list_head list;
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};
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static LIST_HEAD(page_alloc_sort_input);
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static LIST_HEAD(page_caller_sort_input);
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static struct page_stat *
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__page_stat__findnew_page(u64 page, bool create)
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__page_stat__findnew_page(struct page_stat *pstat, bool create)
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{
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struct rb_node **node = &page_tree.rb_node;
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struct rb_node **node = &page_live_tree.rb_node;
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struct rb_node *parent = NULL;
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struct page_stat *data;
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@ -416,7 +426,7 @@ __page_stat__findnew_page(u64 page, bool create)
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parent = *node;
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data = rb_entry(*node, struct page_stat, node);
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cmp = data->page - page;
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cmp = data->page - pstat->page;
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if (cmp < 0)
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node = &parent->rb_left;
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else if (cmp > 0)
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@ -430,34 +440,28 @@ __page_stat__findnew_page(u64 page, bool create)
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data = zalloc(sizeof(*data));
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if (data != NULL) {
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data->page = page;
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data->page = pstat->page;
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data->order = pstat->order;
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data->gfp_flags = pstat->gfp_flags;
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data->migrate_type = pstat->migrate_type;
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rb_link_node(&data->node, parent, node);
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rb_insert_color(&data->node, &page_tree);
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rb_insert_color(&data->node, &page_live_tree);
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}
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return data;
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}
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static struct page_stat *page_stat__find_page(u64 page)
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static struct page_stat *page_stat__find_page(struct page_stat *pstat)
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{
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return __page_stat__findnew_page(page, false);
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return __page_stat__findnew_page(pstat, false);
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}
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static struct page_stat *page_stat__findnew_page(u64 page)
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static struct page_stat *page_stat__findnew_page(struct page_stat *pstat)
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{
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return __page_stat__findnew_page(page, true);
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return __page_stat__findnew_page(pstat, true);
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}
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struct sort_dimension {
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const char name[20];
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sort_fn_t cmp;
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struct list_head list;
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};
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static LIST_HEAD(page_alloc_sort_input);
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static LIST_HEAD(page_caller_sort_input);
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static struct page_stat *
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__page_stat__findnew_alloc(struct page_stat *pstat, bool create)
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{
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@ -615,17 +619,8 @@ static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
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* This is to find the current page (with correct gfp flags and
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* migrate type) at free event.
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*/
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pstat = page_stat__findnew_page(page);
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if (pstat == NULL)
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return -ENOMEM;
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pstat->order = order;
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pstat->gfp_flags = gfp_flags;
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pstat->migrate_type = migrate_type;
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pstat->callsite = callsite;
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this.page = page;
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pstat = page_stat__findnew_alloc(&this);
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pstat = page_stat__findnew_page(&this);
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if (pstat == NULL)
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return -ENOMEM;
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@ -633,6 +628,16 @@ static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
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pstat->alloc_bytes += bytes;
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pstat->callsite = callsite;
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if (!live_page) {
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pstat = page_stat__findnew_alloc(&this);
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if (pstat == NULL)
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return -ENOMEM;
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pstat->nr_alloc++;
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pstat->alloc_bytes += bytes;
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pstat->callsite = callsite;
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}
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this.callsite = callsite;
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pstat = page_stat__findnew_caller(&this);
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if (pstat == NULL)
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@ -665,7 +670,8 @@ static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
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nr_page_frees++;
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total_page_free_bytes += bytes;
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pstat = page_stat__find_page(page);
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this.page = page;
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pstat = page_stat__find_page(&this);
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if (pstat == NULL) {
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pr_debug2("missing free at page %"PRIx64" (order: %d)\n",
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page, order);
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@ -676,20 +682,23 @@ static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
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return 0;
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}
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this.page = page;
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this.gfp_flags = pstat->gfp_flags;
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this.migrate_type = pstat->migrate_type;
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this.callsite = pstat->callsite;
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rb_erase(&pstat->node, &page_tree);
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rb_erase(&pstat->node, &page_live_tree);
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free(pstat);
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pstat = page_stat__find_alloc(&this);
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if (pstat == NULL)
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return -ENOENT;
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if (live_page) {
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order_stats[this.order][this.migrate_type]--;
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} else {
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pstat = page_stat__find_alloc(&this);
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if (pstat == NULL)
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return -ENOMEM;
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pstat->nr_free++;
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pstat->free_bytes += bytes;
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pstat->nr_free++;
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pstat->free_bytes += bytes;
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}
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pstat = page_stat__find_caller(&this);
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if (pstat == NULL)
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@ -698,6 +707,16 @@ static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
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pstat->nr_free++;
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pstat->free_bytes += bytes;
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if (live_page) {
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pstat->nr_alloc--;
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pstat->alloc_bytes -= bytes;
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if (pstat->nr_alloc == 0) {
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rb_erase(&pstat->node, &page_caller_tree);
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free(pstat);
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}
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}
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return 0;
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}
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@ -815,8 +834,8 @@ static void __print_page_alloc_result(struct perf_session *session, int n_lines)
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const char *format;
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printf("\n%.105s\n", graph_dotted_line);
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printf(" %-16s | Total alloc (KB) | Hits | Order | Mig.type | GFP flags | Callsite\n",
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use_pfn ? "PFN" : "Page");
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printf(" %-16s | %5s alloc (KB) | Hits | Order | Mig.type | GFP flags | Callsite\n",
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use_pfn ? "PFN" : "Page", live_page ? "Live" : "Total");
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printf("%.105s\n", graph_dotted_line);
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if (use_pfn)
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@ -860,7 +879,8 @@ static void __print_page_caller_result(struct perf_session *session, int n_lines
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struct machine *machine = &session->machines.host;
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printf("\n%.105s\n", graph_dotted_line);
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printf(" Total alloc (KB) | Hits | Order | Mig.type | GFP flags | Callsite\n");
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printf(" %5s alloc (KB) | Hits | Order | Mig.type | GFP flags | Callsite\n",
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live_page ? "Live" : "Total");
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printf("%.105s\n", graph_dotted_line);
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while (next && n_lines--) {
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@ -1085,8 +1105,13 @@ static void sort_result(void)
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&slab_caller_sort);
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}
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if (kmem_page) {
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__sort_page_result(&page_alloc_tree, &page_alloc_sorted,
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&page_alloc_sort);
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if (live_page)
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__sort_page_result(&page_live_tree, &page_alloc_sorted,
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&page_alloc_sort);
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else
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__sort_page_result(&page_alloc_tree, &page_alloc_sorted,
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&page_alloc_sort);
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__sort_page_result(&page_caller_tree, &page_caller_sorted,
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&page_caller_sort);
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}
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@ -1630,6 +1655,7 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
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parse_slab_opt),
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OPT_CALLBACK_NOOPT(0, "page", NULL, NULL, "Analyze page allocator",
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parse_page_opt),
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OPT_BOOLEAN(0, "live", &live_page, "Show live page stat"),
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OPT_END()
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};
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const char *const kmem_subcommands[] = { "record", "stat", NULL };
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