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perf kmem: Analyze page allocator events also
The perf kmem command records and analyze kernel memory allocation only
for SLAB objects. This patch implement a simple page allocator analyzer
using kmem:mm_page_alloc and kmem:mm_page_free events.
It adds two new options of --slab and --page. The --slab option is for
analyzing SLAB allocator and that's what perf kmem currently does.
The new --page option enables page allocator events and analyze kernel
memory usage in page unit. Currently, 'stat --alloc' subcommand is
implemented only.
If none of these --slab nor --page is specified, --slab is implied.
First run 'perf kmem record' to generate a suitable perf.data file:
# perf kmem record --page sleep 5
Then run 'perf kmem stat' to postprocess the perf.data file:
# perf kmem stat --page --alloc --line 10
-------------------------------------------------------------------------------
PFN | Total alloc (KB) | Hits | Order | Mig.type | GFP flags
-------------------------------------------------------------------------------
4045014 | 16 | 1 | 2 | RECLAIM | 00285250
4143980 | 16 | 1 | 2 | RECLAIM | 00285250
3938658 | 16 | 1 | 2 | RECLAIM | 00285250
4045400 | 16 | 1 | 2 | RECLAIM | 00285250
3568708 | 16 | 1 | 2 | RECLAIM | 00285250
3729824 | 16 | 1 | 2 | RECLAIM | 00285250
3657210 | 16 | 1 | 2 | RECLAIM | 00285250
4120750 | 16 | 1 | 2 | RECLAIM | 00285250
3678850 | 16 | 1 | 2 | RECLAIM | 00285250
3693874 | 16 | 1 | 2 | RECLAIM | 00285250
... | ... | ... | ... | ... | ...
-------------------------------------------------------------------------------
SUMMARY (page allocator)
========================
Total allocation requests : 44,260 [ 177,256 KB ]
Total free requests : 117 [ 468 KB ]
Total alloc+freed requests : 49 [ 196 KB ]
Total alloc-only requests : 44,211 [ 177,060 KB ]
Total free-only requests : 68 [ 272 KB ]
Total allocation failures : 0 [ 0 KB ]
Order Unmovable Reclaimable Movable Reserved CMA/Isolated
----- ------------ ------------ ------------ ------------ ------------
0 32 . 44,210 . .
1 . . . . .
2 . 18 . . .
3 . . . . .
4 . . . . .
5 . . . . .
6 . . . . .
7 . . . . .
8 . . . . .
9 . . . . .
10 . . . . .
Signed-off-by: Namhyung Kim <namhyung@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/1428298576-9785-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
Arnaldo Carvalho de Melo
parent
9fdd8a875c
commit
0d68bc92c4
2 changed files with 491 additions and 17 deletions
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@ -3,7 +3,7 @@ perf-kmem(1)
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NAME
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----
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perf-kmem - Tool to trace/measure kernel memory(slab) properties
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perf-kmem - Tool to trace/measure kernel memory properties
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SYNOPSIS
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--------
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@ -46,6 +46,12 @@ OPTIONS
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--raw-ip::
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Print raw ip instead of symbol
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--slab::
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Analyze SLAB allocator events.
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--page::
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Analyze page allocator events
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SEE ALSO
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--------
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linkperf:perf-record[1]
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@ -22,6 +22,11 @@
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#include <linux/string.h>
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#include <locale.h>
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static int kmem_slab;
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static int kmem_page;
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static long kmem_page_size;
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struct alloc_stat;
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typedef int (*sort_fn_t)(struct alloc_stat *, struct alloc_stat *);
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@ -226,6 +231,244 @@ static int perf_evsel__process_free_event(struct perf_evsel *evsel,
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return 0;
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}
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static u64 total_page_alloc_bytes;
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static u64 total_page_free_bytes;
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static u64 total_page_nomatch_bytes;
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static u64 total_page_fail_bytes;
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static unsigned long nr_page_allocs;
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static unsigned long nr_page_frees;
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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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#define MAX_MIGRATE_TYPES 6
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#define MAX_PAGE_ORDER 11
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static int order_stats[MAX_PAGE_ORDER][MAX_MIGRATE_TYPES];
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struct page_stat {
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struct rb_node node;
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u64 page;
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int order;
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unsigned gfp_flags;
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unsigned migrate_type;
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u64 alloc_bytes;
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u64 free_bytes;
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int nr_alloc;
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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_alloc_tree;
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static struct rb_root page_alloc_sorted;
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static struct page_stat *search_page(unsigned long page, 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 *parent = NULL;
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struct page_stat *data;
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while (*node) {
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s64 cmp;
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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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if (cmp < 0)
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node = &parent->rb_left;
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else if (cmp > 0)
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node = &parent->rb_right;
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else
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return data;
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}
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if (!create)
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return NULL;
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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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rb_link_node(&data->node, parent, node);
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rb_insert_color(&data->node, &page_tree);
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}
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return data;
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}
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static int page_stat_cmp(struct page_stat *a, struct page_stat *b)
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{
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if (a->page > b->page)
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return -1;
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if (a->page < b->page)
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return 1;
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if (a->order > b->order)
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return -1;
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if (a->order < b->order)
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return 1;
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if (a->migrate_type > b->migrate_type)
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return -1;
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if (a->migrate_type < b->migrate_type)
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return 1;
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if (a->gfp_flags > b->gfp_flags)
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return -1;
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if (a->gfp_flags < b->gfp_flags)
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return 1;
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return 0;
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}
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static struct page_stat *search_page_alloc_stat(struct page_stat *stat, bool create)
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{
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struct rb_node **node = &page_alloc_tree.rb_node;
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struct rb_node *parent = NULL;
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struct page_stat *data;
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while (*node) {
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s64 cmp;
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parent = *node;
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data = rb_entry(*node, struct page_stat, node);
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cmp = page_stat_cmp(data, stat);
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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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node = &parent->rb_right;
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else
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return data;
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}
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if (!create)
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return NULL;
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data = zalloc(sizeof(*data));
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if (data != NULL) {
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data->page = stat->page;
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data->order = stat->order;
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data->gfp_flags = stat->gfp_flags;
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data->migrate_type = stat->migrate_type;
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rb_link_node(&data->node, parent, node);
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rb_insert_color(&data->node, &page_alloc_tree);
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}
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return data;
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}
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static bool valid_page(u64 pfn_or_page)
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{
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if (use_pfn && pfn_or_page == -1UL)
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return false;
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if (!use_pfn && pfn_or_page == 0)
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return false;
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return true;
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}
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static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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u64 page;
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unsigned int order = perf_evsel__intval(evsel, sample, "order");
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unsigned int gfp_flags = perf_evsel__intval(evsel, sample, "gfp_flags");
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unsigned int migrate_type = perf_evsel__intval(evsel, sample,
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"migratetype");
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u64 bytes = kmem_page_size << order;
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struct page_stat *stat;
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struct page_stat this = {
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.order = order,
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.gfp_flags = gfp_flags,
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.migrate_type = migrate_type,
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};
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if (use_pfn)
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page = perf_evsel__intval(evsel, sample, "pfn");
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else
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page = perf_evsel__intval(evsel, sample, "page");
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nr_page_allocs++;
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total_page_alloc_bytes += bytes;
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if (!valid_page(page)) {
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nr_page_fails++;
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total_page_fail_bytes += bytes;
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return 0;
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}
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/*
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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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stat = search_page(page, true);
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if (stat == NULL)
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return -ENOMEM;
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stat->order = order;
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stat->gfp_flags = gfp_flags;
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stat->migrate_type = migrate_type;
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this.page = page;
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stat = search_page_alloc_stat(&this, true);
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if (stat == NULL)
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return -ENOMEM;
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stat->nr_alloc++;
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stat->alloc_bytes += bytes;
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order_stats[order][migrate_type]++;
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return 0;
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}
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static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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u64 page;
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unsigned int order = perf_evsel__intval(evsel, sample, "order");
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u64 bytes = kmem_page_size << order;
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struct page_stat *stat;
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struct page_stat this = {
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.order = order,
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};
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if (use_pfn)
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page = perf_evsel__intval(evsel, sample, "pfn");
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else
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page = perf_evsel__intval(evsel, sample, "page");
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nr_page_frees++;
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total_page_free_bytes += bytes;
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stat = search_page(page, false);
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if (stat == 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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nr_page_nomatch++;
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total_page_nomatch_bytes += bytes;
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return 0;
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}
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this.page = page;
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this.gfp_flags = stat->gfp_flags;
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this.migrate_type = stat->migrate_type;
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rb_erase(&stat->node, &page_tree);
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free(stat);
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stat = search_page_alloc_stat(&this, false);
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if (stat == NULL)
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return -ENOENT;
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stat->nr_free++;
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stat->free_bytes += bytes;
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return 0;
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}
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typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
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struct perf_sample *sample);
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@ -270,8 +513,9 @@ static double fragmentation(unsigned long n_req, unsigned long n_alloc)
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return 100.0 - (100.0 * n_req / n_alloc);
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}
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static void __print_result(struct rb_root *root, struct perf_session *session,
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int n_lines, int is_caller)
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static void __print_slab_result(struct rb_root *root,
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struct perf_session *session,
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int n_lines, int is_caller)
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{
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struct rb_node *next;
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struct machine *machine = &session->machines.host;
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@ -323,9 +567,56 @@ static void __print_result(struct rb_root *root, struct perf_session *session,
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printf("%.105s\n", graph_dotted_line);
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}
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static void print_summary(void)
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static const char * const migrate_type_str[] = {
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"UNMOVABL",
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"RECLAIM",
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"MOVABLE",
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"RESERVED",
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"CMA/ISLT",
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"UNKNOWN",
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};
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static void __print_page_result(struct rb_root *root,
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struct perf_session *session __maybe_unused,
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int n_lines)
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{
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printf("\nSUMMARY\n=======\n");
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struct rb_node *next = rb_first(root);
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const char *format;
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printf("\n%.80s\n", graph_dotted_line);
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printf(" %-16s | Total alloc (KB) | Hits | Order | Mig.type | GFP flags\n",
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use_pfn ? "PFN" : "Page");
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printf("%.80s\n", graph_dotted_line);
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if (use_pfn)
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format = " %16llu | %'16llu | %'9d | %5d | %8s | %08lx\n";
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else
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format = " %016llx | %'16llu | %'9d | %5d | %8s | %08lx\n";
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while (next && n_lines--) {
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struct page_stat *data;
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data = rb_entry(next, struct page_stat, node);
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printf(format, (unsigned long long)data->page,
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(unsigned long long)data->alloc_bytes / 1024,
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data->nr_alloc, data->order,
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migrate_type_str[data->migrate_type],
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(unsigned long)data->gfp_flags);
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next = rb_next(next);
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}
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if (n_lines == -1)
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printf(" ... | ... | ... | ... | ... | ... \n");
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printf("%.80s\n", graph_dotted_line);
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}
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static void print_slab_summary(void)
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{
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printf("\nSUMMARY (SLAB allocator)");
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printf("\n========================\n");
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printf("Total bytes requested: %'lu\n", total_requested);
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printf("Total bytes allocated: %'lu\n", total_allocated);
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printf("Total bytes wasted on internal fragmentation: %'lu\n",
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@ -335,13 +626,73 @@ static void print_summary(void)
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printf("Cross CPU allocations: %'lu/%'lu\n", nr_cross_allocs, nr_allocs);
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}
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static void print_result(struct perf_session *session)
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static void print_page_summary(void)
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{
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int o, m;
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u64 nr_alloc_freed = nr_page_frees - nr_page_nomatch;
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u64 total_alloc_freed_bytes = total_page_free_bytes - total_page_nomatch_bytes;
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printf("\nSUMMARY (page allocator)");
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printf("\n========================\n");
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printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total allocation requests",
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nr_page_allocs, total_page_alloc_bytes / 1024);
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printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total free requests",
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nr_page_frees, total_page_free_bytes / 1024);
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printf("\n");
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printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total alloc+freed requests",
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nr_alloc_freed, (total_alloc_freed_bytes) / 1024);
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printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total alloc-only requests",
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nr_page_allocs - nr_alloc_freed,
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(total_page_alloc_bytes - total_alloc_freed_bytes) / 1024);
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printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total free-only requests",
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nr_page_nomatch, total_page_nomatch_bytes / 1024);
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printf("\n");
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printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total allocation failures",
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nr_page_fails, total_page_fail_bytes / 1024);
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printf("\n");
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printf("%5s %12s %12s %12s %12s %12s\n", "Order", "Unmovable",
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"Reclaimable", "Movable", "Reserved", "CMA/Isolated");
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printf("%.5s %.12s %.12s %.12s %.12s %.12s\n", graph_dotted_line,
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graph_dotted_line, graph_dotted_line, graph_dotted_line,
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graph_dotted_line, graph_dotted_line);
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for (o = 0; o < MAX_PAGE_ORDER; o++) {
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printf("%5d", o);
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for (m = 0; m < MAX_MIGRATE_TYPES - 1; m++) {
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if (order_stats[o][m])
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printf(" %'12d", order_stats[o][m]);
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else
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printf(" %12c", '.');
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}
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printf("\n");
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}
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}
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static void print_slab_result(struct perf_session *session)
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{
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if (caller_flag)
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__print_result(&root_caller_sorted, session, caller_lines, 1);
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__print_slab_result(&root_caller_sorted, session, caller_lines, 1);
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if (alloc_flag)
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__print_result(&root_alloc_sorted, session, alloc_lines, 0);
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print_summary();
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__print_slab_result(&root_alloc_sorted, session, alloc_lines, 0);
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print_slab_summary();
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}
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static void print_page_result(struct perf_session *session)
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{
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if (alloc_flag)
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__print_page_result(&page_alloc_sorted, session, alloc_lines);
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print_page_summary();
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}
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static void print_result(struct perf_session *session)
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{
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if (kmem_slab)
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print_slab_result(session);
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if (kmem_page)
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print_page_result(session);
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}
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struct sort_dimension {
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@ -353,8 +704,8 @@ struct sort_dimension {
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static LIST_HEAD(caller_sort);
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static LIST_HEAD(alloc_sort);
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||||
|
||||
static void sort_insert(struct rb_root *root, struct alloc_stat *data,
|
||||
struct list_head *sort_list)
|
||||
static void sort_slab_insert(struct rb_root *root, struct alloc_stat *data,
|
||||
struct list_head *sort_list)
|
||||
{
|
||||
struct rb_node **new = &(root->rb_node);
|
||||
struct rb_node *parent = NULL;
|
||||
|
|
@ -383,8 +734,8 @@ static void sort_insert(struct rb_root *root, struct alloc_stat *data,
|
|||
rb_insert_color(&data->node, root);
|
||||
}
|
||||
|
||||
static void __sort_result(struct rb_root *root, struct rb_root *root_sorted,
|
||||
struct list_head *sort_list)
|
||||
static void __sort_slab_result(struct rb_root *root, struct rb_root *root_sorted,
|
||||
struct list_head *sort_list)
|
||||
{
|
||||
struct rb_node *node;
|
||||
struct alloc_stat *data;
|
||||
|
|
@ -396,26 +747,79 @@ static void __sort_result(struct rb_root *root, struct rb_root *root_sorted,
|
|||
|
||||
rb_erase(node, root);
|
||||
data = rb_entry(node, struct alloc_stat, node);
|
||||
sort_insert(root_sorted, data, sort_list);
|
||||
sort_slab_insert(root_sorted, data, sort_list);
|
||||
}
|
||||
}
|
||||
|
||||
static void sort_page_insert(struct rb_root *root, struct page_stat *data)
|
||||
{
|
||||
struct rb_node **new = &root->rb_node;
|
||||
struct rb_node *parent = NULL;
|
||||
|
||||
while (*new) {
|
||||
struct page_stat *this;
|
||||
int cmp = 0;
|
||||
|
||||
this = rb_entry(*new, struct page_stat, node);
|
||||
parent = *new;
|
||||
|
||||
/* TODO: support more sort key */
|
||||
cmp = data->alloc_bytes - this->alloc_bytes;
|
||||
|
||||
if (cmp > 0)
|
||||
new = &parent->rb_left;
|
||||
else
|
||||
new = &parent->rb_right;
|
||||
}
|
||||
|
||||
rb_link_node(&data->node, parent, new);
|
||||
rb_insert_color(&data->node, root);
|
||||
}
|
||||
|
||||
static void __sort_page_result(struct rb_root *root, struct rb_root *root_sorted)
|
||||
{
|
||||
struct rb_node *node;
|
||||
struct page_stat *data;
|
||||
|
||||
for (;;) {
|
||||
node = rb_first(root);
|
||||
if (!node)
|
||||
break;
|
||||
|
||||
rb_erase(node, root);
|
||||
data = rb_entry(node, struct page_stat, node);
|
||||
sort_page_insert(root_sorted, data);
|
||||
}
|
||||
}
|
||||
|
||||
static void sort_result(void)
|
||||
{
|
||||
__sort_result(&root_alloc_stat, &root_alloc_sorted, &alloc_sort);
|
||||
__sort_result(&root_caller_stat, &root_caller_sorted, &caller_sort);
|
||||
if (kmem_slab) {
|
||||
__sort_slab_result(&root_alloc_stat, &root_alloc_sorted,
|
||||
&alloc_sort);
|
||||
__sort_slab_result(&root_caller_stat, &root_caller_sorted,
|
||||
&caller_sort);
|
||||
}
|
||||
if (kmem_page) {
|
||||
__sort_page_result(&page_alloc_tree, &page_alloc_sorted);
|
||||
}
|
||||
}
|
||||
|
||||
static int __cmd_kmem(struct perf_session *session)
|
||||
{
|
||||
int err = -EINVAL;
|
||||
struct perf_evsel *evsel;
|
||||
const struct perf_evsel_str_handler kmem_tracepoints[] = {
|
||||
/* slab allocator */
|
||||
{ "kmem:kmalloc", perf_evsel__process_alloc_event, },
|
||||
{ "kmem:kmem_cache_alloc", perf_evsel__process_alloc_event, },
|
||||
{ "kmem:kmalloc_node", perf_evsel__process_alloc_node_event, },
|
||||
{ "kmem:kmem_cache_alloc_node", perf_evsel__process_alloc_node_event, },
|
||||
{ "kmem:kfree", perf_evsel__process_free_event, },
|
||||
{ "kmem:kmem_cache_free", perf_evsel__process_free_event, },
|
||||
/* page allocator */
|
||||
{ "kmem:mm_page_alloc", perf_evsel__process_page_alloc_event, },
|
||||
{ "kmem:mm_page_free", perf_evsel__process_page_free_event, },
|
||||
};
|
||||
|
||||
if (!perf_session__has_traces(session, "kmem record"))
|
||||
|
|
@ -426,10 +830,20 @@ static int __cmd_kmem(struct perf_session *session)
|
|||
goto out;
|
||||
}
|
||||
|
||||
evlist__for_each(session->evlist, evsel) {
|
||||
if (!strcmp(perf_evsel__name(evsel), "kmem:mm_page_alloc") &&
|
||||
perf_evsel__field(evsel, "pfn")) {
|
||||
use_pfn = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
setup_pager();
|
||||
err = perf_session__process_events(session);
|
||||
if (err != 0)
|
||||
if (err != 0) {
|
||||
pr_err("error during process events: %d\n", err);
|
||||
goto out;
|
||||
}
|
||||
sort_result();
|
||||
print_result(session);
|
||||
out:
|
||||
|
|
@ -612,6 +1026,22 @@ static int parse_alloc_opt(const struct option *opt __maybe_unused,
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int parse_slab_opt(const struct option *opt __maybe_unused,
|
||||
const char *arg __maybe_unused,
|
||||
int unset __maybe_unused)
|
||||
{
|
||||
kmem_slab = (kmem_page + 1);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int parse_page_opt(const struct option *opt __maybe_unused,
|
||||
const char *arg __maybe_unused,
|
||||
int unset __maybe_unused)
|
||||
{
|
||||
kmem_page = (kmem_slab + 1);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int parse_line_opt(const struct option *opt __maybe_unused,
|
||||
const char *arg, int unset __maybe_unused)
|
||||
{
|
||||
|
|
@ -634,6 +1064,8 @@ static int __cmd_record(int argc, const char **argv)
|
|||
{
|
||||
const char * const record_args[] = {
|
||||
"record", "-a", "-R", "-c", "1",
|
||||
};
|
||||
const char * const slab_events[] = {
|
||||
"-e", "kmem:kmalloc",
|
||||
"-e", "kmem:kmalloc_node",
|
||||
"-e", "kmem:kfree",
|
||||
|
|
@ -641,10 +1073,19 @@ static int __cmd_record(int argc, const char **argv)
|
|||
"-e", "kmem:kmem_cache_alloc_node",
|
||||
"-e", "kmem:kmem_cache_free",
|
||||
};
|
||||
const char * const page_events[] = {
|
||||
"-e", "kmem:mm_page_alloc",
|
||||
"-e", "kmem:mm_page_free",
|
||||
};
|
||||
unsigned int rec_argc, i, j;
|
||||
const char **rec_argv;
|
||||
|
||||
rec_argc = ARRAY_SIZE(record_args) + argc - 1;
|
||||
if (kmem_slab)
|
||||
rec_argc += ARRAY_SIZE(slab_events);
|
||||
if (kmem_page)
|
||||
rec_argc += ARRAY_SIZE(page_events);
|
||||
|
||||
rec_argv = calloc(rec_argc + 1, sizeof(char *));
|
||||
|
||||
if (rec_argv == NULL)
|
||||
|
|
@ -653,6 +1094,15 @@ static int __cmd_record(int argc, const char **argv)
|
|||
for (i = 0; i < ARRAY_SIZE(record_args); i++)
|
||||
rec_argv[i] = strdup(record_args[i]);
|
||||
|
||||
if (kmem_slab) {
|
||||
for (j = 0; j < ARRAY_SIZE(slab_events); j++, i++)
|
||||
rec_argv[i] = strdup(slab_events[j]);
|
||||
}
|
||||
if (kmem_page) {
|
||||
for (j = 0; j < ARRAY_SIZE(page_events); j++, i++)
|
||||
rec_argv[i] = strdup(page_events[j]);
|
||||
}
|
||||
|
||||
for (j = 1; j < (unsigned int)argc; j++, i++)
|
||||
rec_argv[i] = argv[j];
|
||||
|
||||
|
|
@ -679,6 +1129,10 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
|
|||
OPT_CALLBACK('l', "line", NULL, "num", "show n lines", parse_line_opt),
|
||||
OPT_BOOLEAN(0, "raw-ip", &raw_ip, "show raw ip instead of symbol"),
|
||||
OPT_BOOLEAN('f', "force", &file.force, "don't complain, do it"),
|
||||
OPT_CALLBACK_NOOPT(0, "slab", NULL, NULL, "Analyze slab allocator",
|
||||
parse_slab_opt),
|
||||
OPT_CALLBACK_NOOPT(0, "page", NULL, NULL, "Analyze page allocator",
|
||||
parse_page_opt),
|
||||
OPT_END()
|
||||
};
|
||||
const char *const kmem_subcommands[] = { "record", "stat", NULL };
|
||||
|
|
@ -695,6 +1149,9 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
|
|||
if (!argc)
|
||||
usage_with_options(kmem_usage, kmem_options);
|
||||
|
||||
if (kmem_slab == 0 && kmem_page == 0)
|
||||
kmem_slab = 1; /* for backward compatibility */
|
||||
|
||||
if (!strncmp(argv[0], "rec", 3)) {
|
||||
symbol__init(NULL);
|
||||
return __cmd_record(argc, argv);
|
||||
|
|
@ -706,6 +1163,17 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
|
|||
if (session == NULL)
|
||||
return -1;
|
||||
|
||||
if (kmem_page) {
|
||||
struct perf_evsel *evsel = perf_evlist__first(session->evlist);
|
||||
|
||||
if (evsel == NULL || evsel->tp_format == NULL) {
|
||||
pr_err("invalid event found.. aborting\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
kmem_page_size = pevent_get_page_size(evsel->tp_format->pevent);
|
||||
}
|
||||
|
||||
symbol__init(&session->header.env);
|
||||
|
||||
if (!strcmp(argv[0], "stat")) {
|
||||
|
|
|
|||
Loading…
Reference in a new issue