Initial import

1 files changed, 1199 insertions, 0 deletions

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
new file mode 100644
index 000000000..1634186d5
--- /dev/null
+++ b/tools/perf/builtin-kmem.c
@@ -0,0 +1,1199 @@
+#include "builtin.h"
+#include "perf.h"
+
+#include "util/evlist.h"
+#include "util/evsel.h"
+#include "util/util.h"
+#include "util/cache.h"
+#include "util/symbol.h"
+#include "util/thread.h"
+#include "util/header.h"
+#include "util/session.h"
+#include "util/tool.h"
+
+#include "util/parse-options.h"
+#include "util/trace-event.h"
+#include "util/data.h"
+#include "util/cpumap.h"
+
+#include "util/debug.h"
+
+#include <linux/rbtree.h>
+#include <linux/string.h>
+#include <locale.h>
+
+static int	kmem_slab;
+static int	kmem_page;
+
+static long	kmem_page_size;
+
+struct alloc_stat;
+typedef int (*sort_fn_t)(struct alloc_stat *, struct alloc_stat *);
+
+static int			alloc_flag;
+static int			caller_flag;
+
+static int			alloc_lines = -1;
+static int			caller_lines = -1;
+
+static bool			raw_ip;
+
+struct alloc_stat {
+	u64	call_site;
+	u64	ptr;
+	u64	bytes_req;
+	u64	bytes_alloc;
+	u32	hit;
+	u32	pingpong;
+
+	short	alloc_cpu;
+
+	struct rb_node node;
+};
+
+static struct rb_root root_alloc_stat;
+static struct rb_root root_alloc_sorted;
+static struct rb_root root_caller_stat;
+static struct rb_root root_caller_sorted;
+
+static unsigned long total_requested, total_allocated;
+static unsigned long nr_allocs, nr_cross_allocs;
+
+static int insert_alloc_stat(unsigned long call_site, unsigned long ptr,
+			     int bytes_req, int bytes_alloc, int cpu)
+{
+	struct rb_node **node = &root_alloc_stat.rb_node;
+	struct rb_node *parent = NULL;
+	struct alloc_stat *data = NULL;
+
+	while (*node) {
+		parent = *node;
+		data = rb_entry(*node, struct alloc_stat, node);
+
+		if (ptr > data->ptr)
+			node = &(*node)->rb_right;
+		else if (ptr < data->ptr)
+			node = &(*node)->rb_left;
+		else
+			break;
+	}
+
+	if (data && data->ptr == ptr) {
+		data->hit++;
+		data->bytes_req += bytes_req;
+		data->bytes_alloc += bytes_alloc;
+	} else {
+		data = malloc(sizeof(*data));
+		if (!data) {
+			pr_err("%s: malloc failed\n", __func__);
+			return -1;
+		}
+		data->ptr = ptr;
+		data->pingpong = 0;
+		data->hit = 1;
+		data->bytes_req = bytes_req;
+		data->bytes_alloc = bytes_alloc;
+
+		rb_link_node(&data->node, parent, node);
+		rb_insert_color(&data->node, &root_alloc_stat);
+	}
+	data->call_site = call_site;
+	data->alloc_cpu = cpu;
+	return 0;
+}
+
+static int insert_caller_stat(unsigned long call_site,
+			      int bytes_req, int bytes_alloc)
+{
+	struct rb_node **node = &root_caller_stat.rb_node;
+	struct rb_node *parent = NULL;
+	struct alloc_stat *data = NULL;
+
+	while (*node) {
+		parent = *node;
+		data = rb_entry(*node, struct alloc_stat, node);
+
+		if (call_site > data->call_site)
+			node = &(*node)->rb_right;
+		else if (call_site < data->call_site)
+			node = &(*node)->rb_left;
+		else
+			break;
+	}
+
+	if (data && data->call_site == call_site) {
+		data->hit++;
+		data->bytes_req += bytes_req;
+		data->bytes_alloc += bytes_alloc;
+	} else {
+		data = malloc(sizeof(*data));
+		if (!data) {
+			pr_err("%s: malloc failed\n", __func__);
+			return -1;
+		}
+		data->call_site = call_site;
+		data->pingpong = 0;
+		data->hit = 1;
+		data->bytes_req = bytes_req;
+		data->bytes_alloc = bytes_alloc;
+
+		rb_link_node(&data->node, parent, node);
+		rb_insert_color(&data->node, &root_caller_stat);
+	}
+
+	return 0;
+}
+
+static int perf_evsel__process_alloc_event(struct perf_evsel *evsel,
+					   struct perf_sample *sample)
+{
+	unsigned long ptr = perf_evsel__intval(evsel, sample, "ptr"),
+		      call_site = perf_evsel__intval(evsel, sample, "call_site");
+	int bytes_req = perf_evsel__intval(evsel, sample, "bytes_req"),
+	    bytes_alloc = perf_evsel__intval(evsel, sample, "bytes_alloc");
+
+	if (insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, sample->cpu) ||
+	    insert_caller_stat(call_site, bytes_req, bytes_alloc))
+		return -1;
+
+	total_requested += bytes_req;
+	total_allocated += bytes_alloc;
+
+	nr_allocs++;
+	return 0;
+}
+
+static int perf_evsel__process_alloc_node_event(struct perf_evsel *evsel,
+						struct perf_sample *sample)
+{
+	int ret = perf_evsel__process_alloc_event(evsel, sample);
+
+	if (!ret) {
+		int node1 = cpu__get_node(sample->cpu),
+		    node2 = perf_evsel__intval(evsel, sample, "node");
+
+		if (node1 != node2)
+			nr_cross_allocs++;
+	}
+
+	return ret;
+}
+
+static int ptr_cmp(struct alloc_stat *, struct alloc_stat *);
+static int callsite_cmp(struct alloc_stat *, struct alloc_stat *);
+
+static struct alloc_stat *search_alloc_stat(unsigned long ptr,
+					    unsigned long call_site,
+					    struct rb_root *root,
+					    sort_fn_t sort_fn)
+{
+	struct rb_node *node = root->rb_node;
+	struct alloc_stat key = { .ptr = ptr, .call_site = call_site };
+
+	while (node) {
+		struct alloc_stat *data;
+		int cmp;
+
+		data = rb_entry(node, struct alloc_stat, node);
+
+		cmp = sort_fn(&key, data);
+		if (cmp < 0)
+			node = node->rb_left;
+		else if (cmp > 0)
+			node = node->rb_right;
+		else
+			return data;
+	}
+	return NULL;
+}
+
+static int perf_evsel__process_free_event(struct perf_evsel *evsel,
+					  struct perf_sample *sample)
+{
+	unsigned long ptr = perf_evsel__intval(evsel, sample, "ptr");
+	struct alloc_stat *s_alloc, *s_caller;
+
+	s_alloc = search_alloc_stat(ptr, 0, &root_alloc_stat, ptr_cmp);
+	if (!s_alloc)
+		return 0;
+
+	if ((short)sample->cpu != s_alloc->alloc_cpu) {
+		s_alloc->pingpong++;
+
+		s_caller = search_alloc_stat(0, s_alloc->call_site,
+					     &root_caller_stat, callsite_cmp);
+		if (!s_caller)
+			return -1;
+		s_caller->pingpong++;
+	}
+	s_alloc->alloc_cpu = -1;
+
+	return 0;
+}
+
+static u64 total_page_alloc_bytes;
+static u64 total_page_free_bytes;
+static u64 total_page_nomatch_bytes;
+static u64 total_page_fail_bytes;
+static unsigned long nr_page_allocs;
+static unsigned long nr_page_frees;
+static unsigned long nr_page_fails;
+static unsigned long nr_page_nomatch;
+
+static bool use_pfn;
+
+#define MAX_MIGRATE_TYPES  6
+#define MAX_PAGE_ORDER     11
+
+static int order_stats[MAX_PAGE_ORDER][MAX_MIGRATE_TYPES];
+
+struct page_stat {
+	struct rb_node 	node;
+	u64 		page;
+	int 		order;
+	unsigned 	gfp_flags;
+	unsigned 	migrate_type;
+	u64		alloc_bytes;
+	u64 		free_bytes;
+	int 		nr_alloc;
+	int 		nr_free;
+};
+
+static struct rb_root page_tree;
+static struct rb_root page_alloc_tree;
+static struct rb_root page_alloc_sorted;
+
+static struct page_stat *search_page(unsigned long page, bool create)
+{
+	struct rb_node **node = &page_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 - 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 = page;
+
+		rb_link_node(&data->node, parent, node);
+		rb_insert_color(&data->node, &page_tree);
+	}
+
+	return data;
+}
+
+static int page_stat_cmp(struct page_stat *a, struct page_stat *b)
+{
+	if (a->page > b->page)
+		return -1;
+	if (a->page < b->page)
+		return 1;
+	if (a->order > b->order)
+		return -1;
+	if (a->order < b->order)
+		return 1;
+	if (a->migrate_type > b->migrate_type)
+		return -1;
+	if (a->migrate_type < b->migrate_type)
+		return 1;
+	if (a->gfp_flags > b->gfp_flags)
+		return -1;
+	if (a->gfp_flags < b->gfp_flags)
+		return 1;
+	return 0;
+}
+
+static struct page_stat *search_page_alloc_stat(struct page_stat *pstat, bool create)
+{
+	struct rb_node **node = &page_alloc_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 = page_stat_cmp(data, pstat);
+		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 = pstat->page;
+		data->order = pstat->order;
+		data->gfp_flags = pstat->gfp_flags;
+		data->migrate_type = pstat->migrate_type;
+
+		rb_link_node(&data->node, parent, node);
+		rb_insert_color(&data->node, &page_alloc_tree);
+	}
+
+	return data;
+}
+
+static bool valid_page(u64 pfn_or_page)
+{
+	if (use_pfn && pfn_or_page == -1UL)
+		return false;
+	if (!use_pfn && pfn_or_page == 0)
+		return false;
+	return true;
+}
+
+static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
+						struct perf_sample *sample)
+{
+	u64 page;
+	unsigned int order = perf_evsel__intval(evsel, sample, "order");
+	unsigned int gfp_flags = perf_evsel__intval(evsel, sample, "gfp_flags");
+	unsigned int migrate_type = perf_evsel__intval(evsel, sample,
+						       "migratetype");
+	u64 bytes = kmem_page_size << order;
+	struct page_stat *pstat;
+	struct page_stat this = {
+		.order = order,
+		.gfp_flags = gfp_flags,
+		.migrate_type = migrate_type,
+	};
+
+	if (use_pfn)
+		page = perf_evsel__intval(evsel, sample, "pfn");
+	else
+		page = perf_evsel__intval(evsel, sample, "page");
+
+	nr_page_allocs++;
+	total_page_alloc_bytes += bytes;
+
+	if (!valid_page(page)) {
+		nr_page_fails++;
+		total_page_fail_bytes += bytes;
+
+		return 0;
+	}
+
+	/*
+	 * This is to find the current page (with correct gfp flags and
+	 * migrate type) at free event.
+	 */
+	pstat = search_page(page, true);
+	if (pstat == NULL)
+		return -ENOMEM;
+
+	pstat->order = order;
+	pstat->gfp_flags = gfp_flags;
+	pstat->migrate_type = migrate_type;
+
+	this.page = page;
+	pstat = search_page_alloc_stat(&this, true);
+	if (pstat == NULL)
+		return -ENOMEM;
+
+	pstat->nr_alloc++;
+	pstat->alloc_bytes += bytes;
+
+	order_stats[order][migrate_type]++;
+
+	return 0;
+}
+
+static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
+						struct perf_sample *sample)
+{
+	u64 page;
+	unsigned int order = perf_evsel__intval(evsel, sample, "order");
+	u64 bytes = kmem_page_size << order;
+	struct page_stat *pstat;
+	struct page_stat this = {
+		.order = order,
+	};
+
+	if (use_pfn)
+		page = perf_evsel__intval(evsel, sample, "pfn");
+	else
+		page = perf_evsel__intval(evsel, sample, "page");
+
+	nr_page_frees++;
+	total_page_free_bytes += bytes;
+
+	pstat = search_page(page, false);
+	if (pstat == NULL) {
+		pr_debug2("missing free at page %"PRIx64" (order: %d)\n",
+			  page, order);
+
+		nr_page_nomatch++;
+		total_page_nomatch_bytes += bytes;
+
+		return 0;
+	}
+
+	this.page = page;
+	this.gfp_flags = pstat->gfp_flags;
+	this.migrate_type = pstat->migrate_type;
+
+	rb_erase(&pstat->node, &page_tree);
+	free(pstat);
+
+	pstat = search_page_alloc_stat(&this, false);
+	if (pstat == NULL)
+		return -ENOENT;
+
+	pstat->nr_free++;
+	pstat->free_bytes += bytes;
+
+	return 0;
+}
+
+typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
+				  struct perf_sample *sample);
+
+static int process_sample_event(struct perf_tool *tool __maybe_unused,
+				union perf_event *event,
+				struct perf_sample *sample,
+				struct perf_evsel *evsel,
+				struct machine *machine)
+{
+	struct thread *thread = machine__findnew_thread(machine, sample->pid,
+							sample->tid);
+
+	if (thread == NULL) {
+		pr_debug("problem processing %d event, skipping it.\n",
+			 event->header.type);
+		return -1;
+	}
+
+	dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
+
+	if (evsel->handler != NULL) {
+		tracepoint_handler f = evsel->handler;
+		return f(evsel, sample);
+	}
+
+	return 0;
+}
+
+static struct perf_tool perf_kmem = {
+	.sample		 = process_sample_event,
+	.comm		 = perf_event__process_comm,
+	.mmap		 = perf_event__process_mmap,
+	.mmap2		 = perf_event__process_mmap2,
+	.ordered_events	 = true,
+};
+
+static double fragmentation(unsigned long n_req, unsigned long n_alloc)
+{
+	if (n_alloc == 0)
+		return 0.0;
+	else
+		return 100.0 - (100.0 * n_req / n_alloc);
+}
+
+static void __print_slab_result(struct rb_root *root,
+				struct perf_session *session,
+				int n_lines, int is_caller)
+{
+	struct rb_node *next;
+	struct machine *machine = &session->machines.host;
+
+	printf("%.105s\n", graph_dotted_line);
+	printf(" %-34s |",  is_caller ? "Callsite": "Alloc Ptr");
+	printf(" Total_alloc/Per | Total_req/Per   | Hit      | Ping-pong | Frag\n");
+	printf("%.105s\n", graph_dotted_line);
+
+	next = rb_first(root);
+
+	while (next && n_lines--) {
+		struct alloc_stat *data = rb_entry(next, struct alloc_stat,
+						   node);
+		struct symbol *sym = NULL;
+		struct map *map;
+		char buf[BUFSIZ];
+		u64 addr;
+
+		if (is_caller) {
+			addr = data->call_site;
+			if (!raw_ip)
+				sym = machine__find_kernel_function(machine, addr, &map, NULL);
+		} else
+			addr = data->ptr;
+
+		if (sym != NULL)
+			snprintf(buf, sizeof(buf), "%s+%" PRIx64 "", sym->name,
+				 addr - map->unmap_ip(map, sym->start));
+		else
+			snprintf(buf, sizeof(buf), "%#" PRIx64 "", addr);
+		printf(" %-34s |", buf);
+
+		printf(" %9llu/%-5lu | %9llu/%-5lu | %8lu | %9lu | %6.3f%%\n",
+		       (unsigned long long)data->bytes_alloc,
+		       (unsigned long)data->bytes_alloc / data->hit,
+		       (unsigned long long)data->bytes_req,
+		       (unsigned long)data->bytes_req / data->hit,
+		       (unsigned long)data->hit,
+		       (unsigned long)data->pingpong,
+		       fragmentation(data->bytes_req, data->bytes_alloc));
+
+		next = rb_next(next);
+	}
+
+	if (n_lines == -1)
+		printf(" ...                                | ...             | ...             | ...      | ...       | ...   \n");
+
+	printf("%.105s\n", graph_dotted_line);
+}
+
+static const char * const migrate_type_str[] = {
+	"UNMOVABL",
+	"RECLAIM",
+	"MOVABLE",
+	"RESERVED",
+	"CMA/ISLT",
+	"UNKNOWN",
+};
+
+static void __print_page_result(struct rb_root *root,
+				struct perf_session *session __maybe_unused,
+				int n_lines)
+{
+	struct rb_node *next = rb_first(root);
+	const char *format;
+
+	printf("\n%.80s\n", graph_dotted_line);
+	printf(" %-16s | Total alloc (KB) | Hits      | Order | Mig.type | GFP flags\n",
+	       use_pfn ? "PFN" : "Page");
+	printf("%.80s\n", graph_dotted_line);
+
+	if (use_pfn)
+		format = " %16llu | %'16llu | %'9d | %5d | %8s |  %08lx\n";
+	else
+		format = " %016llx | %'16llu | %'9d | %5d | %8s |  %08lx\n";
+
+	while (next && n_lines--) {
+		struct page_stat *data;
+
+		data = rb_entry(next, struct page_stat, node);
+
+		printf(format, (unsigned long long)data->page,
+		       (unsigned long long)data->alloc_bytes / 1024,
+		       data->nr_alloc, data->order,
+		       migrate_type_str[data->migrate_type],
+		       (unsigned long)data->gfp_flags);
+
+		next = rb_next(next);
+	}
+
+	if (n_lines == -1)
+		printf(" ...              | ...              | ...       | ...   | ...      | ...     \n");
+
+	printf("%.80s\n", graph_dotted_line);
+}
+
+static void print_slab_summary(void)
+{
+	printf("\nSUMMARY (SLAB allocator)");
+	printf("\n========================\n");
+	printf("Total bytes requested: %'lu\n", total_requested);
+	printf("Total bytes allocated: %'lu\n", total_allocated);
+	printf("Total bytes wasted on internal fragmentation: %'lu\n",
+	       total_allocated - total_requested);
+	printf("Internal fragmentation: %f%%\n",
+	       fragmentation(total_requested, total_allocated));
+	printf("Cross CPU allocations: %'lu/%'lu\n", nr_cross_allocs, nr_allocs);
+}
+
+static void print_page_summary(void)
+{
+	int o, m;
+	u64 nr_alloc_freed = nr_page_frees - nr_page_nomatch;
+	u64 total_alloc_freed_bytes = total_page_free_bytes - total_page_nomatch_bytes;
+
+	printf("\nSUMMARY (page allocator)");
+	printf("\n========================\n");
+	printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total allocation requests",
+	       nr_page_allocs, total_page_alloc_bytes / 1024);
+	printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total free requests",
+	       nr_page_frees, total_page_free_bytes / 1024);
+	printf("\n");
+
+	printf("%-30s: %'16"PRIu64"   [ %'16"PRIu64" KB ]\n", "Total alloc+freed requests",
+	       nr_alloc_freed, (total_alloc_freed_bytes) / 1024);
+	printf("%-30s: %'16"PRIu64"   [ %'16"PRIu64" KB ]\n", "Total alloc-only requests",
+	       nr_page_allocs - nr_alloc_freed,
+	       (total_page_alloc_bytes - total_alloc_freed_bytes) / 1024);
+	printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total free-only requests",
+	       nr_page_nomatch, total_page_nomatch_bytes / 1024);
+	printf("\n");
+
+	printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total allocation failures",
+	       nr_page_fails, total_page_fail_bytes / 1024);
+	printf("\n");
+
+	printf("%5s  %12s  %12s  %12s  %12s  %12s\n", "Order",  "Unmovable",
+	       "Reclaimable", "Movable", "Reserved", "CMA/Isolated");
+	printf("%.5s  %.12s  %.12s  %.12s  %.12s  %.12s\n", graph_dotted_line,
+	       graph_dotted_line, graph_dotted_line, graph_dotted_line,
+	       graph_dotted_line, graph_dotted_line);
+
+	for (o = 0; o < MAX_PAGE_ORDER; o++) {
+		printf("%5d", o);
+		for (m = 0; m < MAX_MIGRATE_TYPES - 1; m++) {
+			if (order_stats[o][m])
+				printf("  %'12d", order_stats[o][m]);
+			else
+				printf("  %12c", '.');
+		}
+		printf("\n");
+	}
+}
+
+static void print_slab_result(struct perf_session *session)
+{
+	if (caller_flag)
+		__print_slab_result(&root_caller_sorted, session, caller_lines, 1);
+	if (alloc_flag)
+		__print_slab_result(&root_alloc_sorted, session, alloc_lines, 0);
+	print_slab_summary();
+}
+
+static void print_page_result(struct perf_session *session)
+{
+	if (alloc_flag)
+		__print_page_result(&page_alloc_sorted, session, alloc_lines);
+	print_page_summary();
+}
+
+static void print_result(struct perf_session *session)
+{
+	if (kmem_slab)
+		print_slab_result(session);
+	if (kmem_page)
+		print_page_result(session);
+}
+
+struct sort_dimension {
+	const char		name[20];
+	sort_fn_t		cmp;
+	struct list_head	list;
+};
+
+static LIST_HEAD(caller_sort);
+static LIST_HEAD(alloc_sort);
+
+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;
+	struct sort_dimension *sort;
+
+	while (*new) {
+		struct alloc_stat *this;
+		int cmp = 0;
+
+		this = rb_entry(*new, struct alloc_stat, node);
+		parent = *new;
+
+		list_for_each_entry(sort, sort_list, list) {
+			cmp = sort->cmp(data, this);
+			if (cmp)
+				break;
+		}
+
+		if (cmp > 0)
+			new = &((*new)->rb_left);
+		else
+			new = &((*new)->rb_right);
+	}
+
+	rb_link_node(&data->node, parent, new);
+	rb_insert_color(&data->node, root);
+}
+
+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;
+
+	for (;;) {
+		node = rb_first(root);
+		if (!node)
+			break;
+
+		rb_erase(node, root);
+		data = rb_entry(node, struct alloc_stat, node);
+		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)
+{
+	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"))
+		goto out;
+
+	if (perf_session__set_tracepoints_handlers(session, kmem_tracepoints)) {
+		pr_err("Initializing perf session tracepoint handlers failed\n");
+		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) {
+		pr_err("error during process events: %d\n", err);
+		goto out;
+	}
+	sort_result();
+	print_result(session);
+out:
+	return err;
+}
+
+static int ptr_cmp(struct alloc_stat *l, struct alloc_stat *r)
+{
+	if (l->ptr < r->ptr)
+		return -1;
+	else if (l->ptr > r->ptr)
+		return 1;
+	return 0;
+}
+
+static struct sort_dimension ptr_sort_dimension = {
+	.name	= "ptr",
+	.cmp	= ptr_cmp,
+};
+
+static int callsite_cmp(struct alloc_stat *l, struct alloc_stat *r)
+{
+	if (l->call_site < r->call_site)
+		return -1;
+	else if (l->call_site > r->call_site)
+		return 1;
+	return 0;
+}
+
+static struct sort_dimension callsite_sort_dimension = {
+	.name	= "callsite",
+	.cmp	= callsite_cmp,
+};
+
+static int hit_cmp(struct alloc_stat *l, struct alloc_stat *r)
+{
+	if (l->hit < r->hit)
+		return -1;
+	else if (l->hit > r->hit)
+		return 1;
+	return 0;
+}
+
+static struct sort_dimension hit_sort_dimension = {
+	.name	= "hit",
+	.cmp	= hit_cmp,
+};
+
+static int bytes_cmp(struct alloc_stat *l, struct alloc_stat *r)
+{
+	if (l->bytes_alloc < r->bytes_alloc)
+		return -1;
+	else if (l->bytes_alloc > r->bytes_alloc)
+		return 1;
+	return 0;
+}
+
+static struct sort_dimension bytes_sort_dimension = {
+	.name	= "bytes",
+	.cmp	= bytes_cmp,
+};
+
+static int frag_cmp(struct alloc_stat *l, struct alloc_stat *r)
+{
+	double x, y;
+
+	x = fragmentation(l->bytes_req, l->bytes_alloc);
+	y = fragmentation(r->bytes_req, r->bytes_alloc);
+
+	if (x < y)
+		return -1;
+	else if (x > y)
+		return 1;
+	return 0;
+}
+
+static struct sort_dimension frag_sort_dimension = {
+	.name	= "frag",
+	.cmp	= frag_cmp,
+};
+
+static int pingpong_cmp(struct alloc_stat *l, struct alloc_stat *r)
+{
+	if (l->pingpong < r->pingpong)
+		return -1;
+	else if (l->pingpong > r->pingpong)
+		return 1;
+	return 0;
+}
+
+static struct sort_dimension pingpong_sort_dimension = {
+	.name	= "pingpong",
+	.cmp	= pingpong_cmp,
+};
+
+static struct sort_dimension *avail_sorts[] = {
+	&ptr_sort_dimension,
+	&callsite_sort_dimension,
+	&hit_sort_dimension,
+	&bytes_sort_dimension,
+	&frag_sort_dimension,
+	&pingpong_sort_dimension,
+};
+
+#define NUM_AVAIL_SORTS	((int)ARRAY_SIZE(avail_sorts))
+
+static int sort_dimension__add(const char *tok, struct list_head *list)
+{
+	struct sort_dimension *sort;
+	int i;
+
+	for (i = 0; i < NUM_AVAIL_SORTS; i++) {
+		if (!strcmp(avail_sorts[i]->name, tok)) {
+			sort = memdup(avail_sorts[i], sizeof(*avail_sorts[i]));
+			if (!sort) {
+				pr_err("%s: memdup failed\n", __func__);
+				return -1;
+			}
+			list_add_tail(&sort->list, list);
+			return 0;
+		}
+	}
+
+	return -1;
+}
+
+static int setup_sorting(struct list_head *sort_list, const char *arg)
+{
+	char *tok;
+	char *str = strdup(arg);
+	char *pos = str;
+
+	if (!str) {
+		pr_err("%s: strdup failed\n", __func__);
+		return -1;
+	}
+
+	while (true) {
+		tok = strsep(&pos, ",");
+		if (!tok)
+			break;
+		if (sort_dimension__add(tok, sort_list) < 0) {
+			error("Unknown --sort key: '%s'", tok);
+			free(str);
+			return -1;
+		}
+	}
+
+	free(str);
+	return 0;
+}
+
+static int parse_sort_opt(const struct option *opt __maybe_unused,
+			  const char *arg, int unset __maybe_unused)
+{
+	if (!arg)
+		return -1;
+
+	if (caller_flag > alloc_flag)
+		return setup_sorting(&caller_sort, arg);
+	else
+		return setup_sorting(&alloc_sort, arg);
+
+	return 0;
+}
+
+static int parse_caller_opt(const struct option *opt __maybe_unused,
+			    const char *arg __maybe_unused,
+			    int unset __maybe_unused)
+{
+	caller_flag = (alloc_flag + 1);
+	return 0;
+}
+
+static int parse_alloc_opt(const struct option *opt __maybe_unused,
+			   const char *arg __maybe_unused,
+			   int unset __maybe_unused)
+{
+	alloc_flag = (caller_flag + 1);
+	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)
+{
+	int lines;
+
+	if (!arg)
+		return -1;
+
+	lines = strtoul(arg, NULL, 10);
+
+	if (caller_flag > alloc_flag)
+		caller_lines = lines;
+	else
+		alloc_lines = lines;
+
+	return 0;
+}
+
+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",
+	"-e", "kmem:kmem_cache_alloc",
+	"-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)
+		return -ENOMEM;
+
+	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];
+
+	return cmd_record(i, rec_argv, NULL);
+}
+
+int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
+{
+	const char * const default_sort_order = "frag,hit,bytes";
+	struct perf_data_file file = {
+		.mode = PERF_DATA_MODE_READ,
+	};
+	const struct option kmem_options[] = {
+	OPT_STRING('i', "input", &input_name, "file", "input file name"),
+	OPT_INCR('v', "verbose", &verbose,
+		    "be more verbose (show symbol address, etc)"),
+	OPT_CALLBACK_NOOPT(0, "caller", NULL, NULL,
+			   "show per-callsite statistics", parse_caller_opt),
+	OPT_CALLBACK_NOOPT(0, "alloc", NULL, NULL,
+			   "show per-allocation statistics", parse_alloc_opt),
+	OPT_CALLBACK('s', "sort", NULL, "key[,key2...]",
+		     "sort by keys: ptr, call_site, bytes, hit, pingpong, frag",
+		     parse_sort_opt),
+	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 };
+	const char *kmem_usage[] = {
+		NULL,
+		NULL
+	};
+	struct perf_session *session;
+	int ret = -1;
+
+	argc = parse_options_subcommand(argc, argv, kmem_options,
+					kmem_subcommands, kmem_usage, 0);
+
+	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);
+	}
+
+	file.path = input_name;
+
+	session = perf_session__new(&file, false, &perf_kmem);
+	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")) {
+		setlocale(LC_ALL, "");
+
+		if (cpu__setup_cpunode_map())
+			goto out_delete;
+
+		if (list_empty(&caller_sort))
+			setup_sorting(&caller_sort, default_sort_order);
+		if (list_empty(&alloc_sort))
+			setup_sorting(&alloc_sort, default_sort_order);
+
+		ret = __cmd_kmem(session);
+	} else
+		usage_with_options(kmem_usage, kmem_options);
+
+out_delete:
+	perf_session__delete(session);
+
+	return ret;
+}
+