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Date: Thu, 02 Apr 2009 10:12:11 +0300
From: Pekka Enberg <penberg@...helsinki.fi>
To: Ingo Molnar <mingo@...e.hu>
Cc: Mel Gorman <mel@....ul.ie>, Jason Baron <jbaron@...hat.com>,
Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
linux-kernel@...r.kernel.org, mm-commits@...r.kernel.org,
alexn@....su.se, akpm@...ux-foundation.org, alexn@...ia.com,
apw@...dowen.org, cl@...ux-foundation.org, haveblue@...ibm.com,
kamezawa.hiroyu@...fujitu.com,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Steven Rostedt <rostedt@...dmis.org>,
"Fr?d?ric Weisbecker" <fweisbec@...il.com>
Subject: Re: + page-owner-tracking.patch added to -mm tree
On Wed, 2009-04-01 at 17:22 +0200, Ingo Molnar wrote:
> > +kmemtrace_print_page_alloc_user(struct trace_iterator *iter,
> > + struct kmemtrace_page_alloc_entry *entry)
> > +{
> > + struct kmemtrace_user_event_page_alloc *ev_alloc;
> > + struct trace_seq *s = &iter->seq;
> > + struct kmemtrace_user_event *ev;
> > +
> > + ev = trace_seq_reserve(s, sizeof(*ev));
> > + if (!ev)
> > + return TRACE_TYPE_PARTIAL_LINE;
> > +
> > + ev->event_id = KMEMTRACE_USER_PAGE_ALLOC;
> > + ev->type_id = entry->type_id;
> > + ev->event_size = sizeof(*ev) + sizeof(*ev_alloc);
> > + ev->cpu = iter->cpu;
> > + ev->timestamp = iter->ts;
> > + ev->call_site = 0ULL; /* FIXME */
> > + ev->ptr = 0ULL; /* FIXME */
>
> Here we could call save_stack_trace(), in a way like this, to save
> up to 8 entries of the allocation back-trace:
The example code compiled as-is so here's an updated patch! :-) We
should probably do stack traces for _all_ events like you suggested but
that's a bigger ABI change so I did it only for the new page allocation
event.
Pekka
diff --git a/include/trace/kmemtrace.h b/include/trace/kmemtrace.h
index 28ee69f..c71f28b 100644
--- a/include/trace/kmemtrace.h
+++ b/include/trace/kmemtrace.h
@@ -20,6 +20,10 @@ static inline void kmemtrace_init(void)
}
#endif
+DECLARE_TRACE(alloc_pages,
+ TP_PROTO(gfp_t gfp_mask, int order),
+ TP_ARGS(gfp_mask, order));
+
DECLARE_TRACE(kmalloc,
TP_PROTO(unsigned long call_site,
const void *ptr,
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
index 5011f4d..527198b 100644
--- a/kernel/trace/kmemtrace.c
+++ b/kernel/trace/kmemtrace.c
@@ -6,6 +6,7 @@
* Copyright (C) 2008 Frederic Weisbecker <fweisbec@...il.com>
*/
+#include <linux/stacktrace.h>
#include <linux/tracepoint.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
@@ -34,6 +35,28 @@ static struct tracer_flags kmem_tracer_flags = {
static struct trace_array *kmemtrace_array;
/* Trace allocations */
+static void kmemtrace_alloc_pages(gfp_t gfp_mask, int order)
+{
+ struct trace_array *tr = kmemtrace_array;
+ struct kmemtrace_page_alloc_entry *entry;
+ struct ring_buffer_event *event;
+
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, 0, 0);
+
+ entry->ent.type = TRACE_KMEM_PAGE_ALLOC;
+ entry->type_id = KMEMTRACE_TYPE_PAGES,
+ entry->gfp_mask = gfp_mask;
+ entry->order = order;
+
+ ring_buffer_unlock_commit(tr->buffer, event);
+
+ trace_wake_up();
+}
+
static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
unsigned long call_site,
const void *ptr,
@@ -147,6 +170,10 @@ static int kmemtrace_start_probes(void)
{
int err;
+ err = register_trace_alloc_pages(kmemtrace_alloc_pages);
+ if (err)
+ return err;
+
err = register_trace_kmalloc(kmemtrace_kmalloc);
if (err)
return err;
@@ -214,8 +241,9 @@ static void kmemtrace_headers(struct seq_file *s)
* plus the origin CPU, since reordering occurs in-kernel now.
*/
-#define KMEMTRACE_USER_ALLOC 0
-#define KMEMTRACE_USER_FREE 1
+#define KMEMTRACE_USER_ALLOC 0
+#define KMEMTRACE_USER_FREE 1
+#define KMEMTRACE_USER_PAGE_ALLOC 2
struct kmemtrace_user_event {
u8 event_id;
@@ -227,6 +255,14 @@ struct kmemtrace_user_event {
unsigned long ptr;
};
+#define NR_ENTRIES 8
+
+struct kmemtrace_user_event_page_alloc {
+ unsigned gfp_mask;
+ int order;
+ unsigned long entries[NR_ENTRIES];
+};
+
struct kmemtrace_user_event_alloc {
size_t bytes_req;
size_t bytes_alloc;
@@ -235,6 +271,44 @@ struct kmemtrace_user_event_alloc {
};
static enum print_line_t
+kmemtrace_print_page_alloc_user(struct trace_iterator *iter,
+ struct kmemtrace_page_alloc_entry *entry)
+{
+ struct kmemtrace_user_event_page_alloc *ev_alloc;
+ struct trace_seq *s = &iter->seq;
+ struct kmemtrace_user_event *ev;
+ struct stack_trace trace;
+
+ ev = trace_seq_reserve(s, sizeof(*ev));
+ if (!ev)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ ev->event_id = KMEMTRACE_USER_PAGE_ALLOC;
+ ev->type_id = entry->type_id;
+ ev->event_size = sizeof(*ev) + sizeof(*ev_alloc);
+ ev->cpu = iter->cpu;
+ ev->timestamp = iter->ts;
+ ev->call_site = 0ULL; /* FIXME */
+ ev->ptr = 0ULL; /* FIXME */
+
+ ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
+ if (!ev_alloc)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ ev_alloc->gfp_mask = entry->gfp_mask;
+ ev_alloc->order = entry->order;
+
+ trace.nr_entries = 0;
+ trace.max_entries = NR_ENTRIES;
+ trace.entries = ev_alloc->entries;
+ trace.skip = 2;
+
+ save_stack_trace(&trace);
+
+ return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
kmemtrace_print_alloc_user(struct trace_iterator *iter,
struct kmemtrace_alloc_entry *entry)
{
@@ -288,7 +362,49 @@ kmemtrace_print_free_user(struct trace_iterator *iter,
return TRACE_TYPE_HANDLED;
}
-/* The two other following provide a more minimalistic output */
+/* The three other following provide a more minimalistic output */
+static enum print_line_t
+kmemtrace_print_page_alloc_compress(struct trace_iterator *iter,
+ struct kmemtrace_page_alloc_entry *entry)
+{
+ struct trace_seq *s = &iter->seq;
+ int ret;
+
+ /* Alloc entry */
+ ret = trace_seq_printf(s, " + ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Type */
+ switch (entry->type_id) {
+ case KMEMTRACE_TYPE_PAGES:
+ ret = trace_seq_printf(s, "P ");
+ break;
+ default:
+ ret = trace_seq_printf(s, "? ");
+ }
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Flags
+ * TODO: would be better to see the name of the GFP flag names
+ */
+ ret = trace_seq_printf(s, "%08x ", entry->gfp_mask);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Node */
+ ret = trace_seq_printf(s, "%4d ", entry->order);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ if (!trace_seq_printf(s, "\n"))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return TRACE_TYPE_HANDLED;
+}
+
static enum print_line_t
kmemtrace_print_alloc_compress(struct trace_iterator *iter,
struct kmemtrace_alloc_entry *entry)
@@ -418,6 +534,16 @@ static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
struct trace_entry *entry = iter->ent;
switch (entry->type) {
+ case TRACE_KMEM_PAGE_ALLOC: {
+ struct kmemtrace_page_alloc_entry *field;
+
+ trace_assign_type(field, entry);
+ if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
+ return kmemtrace_print_page_alloc_compress(iter, field);
+ else
+ return kmemtrace_print_page_alloc_user(iter, field);
+ }
+
case TRACE_KMEM_ALLOC: {
struct kmemtrace_alloc_entry *field;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index cbc168f..3b1bfa5 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -35,6 +35,7 @@ enum trace_type {
TRACE_SYSCALL_EXIT,
TRACE_KMEM_ALLOC,
TRACE_KMEM_FREE,
+ TRACE_KMEM_PAGE_ALLOC,
TRACE_POWER,
TRACE_BLK,
@@ -188,6 +189,13 @@ enum kmemtrace_type_id {
KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */
};
+struct kmemtrace_page_alloc_entry {
+ struct trace_entry ent;
+ enum kmemtrace_type_id type_id;
+ gfp_t gfp_mask;
+ int order;
+};
+
struct kmemtrace_alloc_entry {
struct trace_entry ent;
enum kmemtrace_type_id type_id;
@@ -328,6 +336,8 @@ extern void __ftrace_bad_type(void);
TRACE_GRAPH_RET); \
IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
+ IF_ASSIGN(var, ent, struct kmemtrace_page_alloc_entry, \
+ TRACE_KMEM_PAGE_ALLOC); \
IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \
TRACE_KMEM_ALLOC); \
IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a3803ea..f939800 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1479,6 +1479,8 @@ __alloc_pages_internal(gfp_t gfp_mask, unsigned int order,
unsigned long did_some_progress;
unsigned long pages_reclaimed = 0;
+ trace_alloc_pages(gfp_mask, order);
+
lockdep_trace_alloc(gfp_mask);
might_sleep_if(wait);
@@ -1676,6 +1678,8 @@ got_pg:
return page;
}
EXPORT_SYMBOL(__alloc_pages_internal);
+DEFINE_TRACE(alloc_pages);
+EXPORT_TRACEPOINT_SYMBOL(alloc_pages);
/*
* Common helper functions.
--
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