[sysprof] Initial port to perf counters
- From: Søren Sandmann Pedersen <ssp src gnome org>
- To: svn-commits-list gnome org
- Cc:
- Subject: [sysprof] Initial port to perf counters
- Date: Mon, 14 Sep 2009 09:06:31 +0000 (UTC)
commit 594a58d67467495761d2d0826555612785dfcb90
Author: Søren Sandmann Pedersen <ssp redhat com>
Date: Sat Sep 5 17:15:19 2009 -0400
Initial port to perf counters
barrier.h | 33 +++
collector.c | 621 ++++++++++++++++++++++++++++++-------------
perf_counter.h | 804 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
process.c | 12 +-
process.h | 1 +
5 files changed, 1281 insertions(+), 190 deletions(-)
---
diff --git a/barrier.h b/barrier.h
new file mode 100644
index 0000000..8d468c2
--- /dev/null
+++ b/barrier.h
@@ -0,0 +1,33 @@
+#if defined(__i386__)
+#define rmb() asm volatile("lock; addl $0,0(%%esp)" ::: "memory")
+#define cpu_relax() asm volatile("rep; nop" ::: "memory");
+#endif
+
+#if defined(__x86_64__)
+#define rmb() asm volatile("lfence" ::: "memory")
+#define cpu_relax() asm volatile("rep; nop" ::: "memory");
+#endif
+
+#ifdef __powerpc__
+#define rmb() asm volatile ("sync" ::: "memory")
+#define cpu_relax() asm volatile ("" ::: "memory");
+#endif
+
+#ifdef __s390__
+#define rmb() asm volatile("bcr 15,0" ::: "memory")
+#define cpu_relax() asm volatile("" ::: "memory");
+#endif
+
+#ifdef __sh__
+#if defined(__SH4A__) || defined(__SH5__)
+# define rmb() asm volatile("synco" ::: "memory")
+#else
+# define rmb() asm volatile("" ::: "memory")
+#endif
+#define cpu_relax() asm volatile("" ::: "memory")
+#endif
+
+#ifdef __hppa__
+#define rmb() asm volatile("" ::: "memory")
+#define cpu_relax() asm volatile("" ::: "memory");
+#endif
diff --git a/collector.c b/collector.c
index ce18e47..524696c 100644
--- a/collector.c
+++ b/collector.c
@@ -17,6 +17,17 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
+#include <stdint.h>
+#include <glib.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+
#include "stackstash.h"
#include "collector.h"
#include "module/sysprof-module.h"
@@ -24,17 +35,66 @@
#include "process.h"
#include "elfparser.h"
-#include <errno.h>
-#include <sys/wait.h>
-#include <sys/types.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <sys/mman.h>
+#include "perf_counter.h"
+#include "barrier.h"
-#define SYSPROF_FILE "/dev/sysprof-trace"
+#define N_PAGES 128 /* Number of pages in the ringbuffer */
-static void set_no_module_error (GError **err);
-static void set_cant_open_error (GError **err, int eno);
+typedef struct counter_t counter_t;
+typedef struct sample_event_t sample_event_t;
+typedef struct mmap_event_t mmap_event_t;
+typedef struct comm_event_t comm_event_t;
+typedef union counter_event_t counter_event_t;
+typedef void (* event_callback_t) (counter_event_t *event, gpointer data);
+
+struct counter_t
+{
+ int fd;
+ struct perf_counter_mmap_page * mmap_page;
+ uint8_t * data;
+
+ uint64_t tail;
+ int cpu;
+
+ event_callback_t callback;
+ gpointer user_data;
+
+ GString * partial;
+};
+
+struct sample_event_t
+{
+ struct perf_event_header header;
+ uint64_t ip;
+ uint32_t pid, tid;
+ uint64_t n_ips;
+ uint64_t ips[1];
+};
+
+struct comm_event_t
+{
+ struct perf_event_header header;
+ uint32_t pid, tid;
+ char comm[];
+};
+
+struct mmap_event_t
+{
+ struct perf_event_header header;
+
+ uint32_t pid, tid;
+ uint64_t addr;
+ uint64_t pgoff;
+ char filename[1];
+};
+
+union counter_event_t
+{
+ struct perf_event_header header;
+ mmap_event_t mmap;
+ comm_event_t comm;
+ sample_event_t sample;
+};
struct Collector
{
@@ -42,23 +102,256 @@ struct Collector
gpointer data;
StackStash * stash;
- int fd;
GTimeVal latest_reset;
+
int n_samples;
- SysprofMmapArea * map_area;
- unsigned int current;
+
+ GList * counters;
};
+static int
+get_n_cpus (void)
+{
+ return sysconf (_SC_NPROCESSORS_ONLN);
+}
+
+static int
+sysprof_perf_counter_open (struct perf_counter_attr *attr,
+ pid_t pid,
+ int cpu,
+ int group_fd,
+ unsigned long flags)
+{
+ attr->size = sizeof(*attr);
+
+ return syscall (__NR_perf_counter_open, attr, pid, cpu, group_fd, flags);
+}
+
+static int
+process_event (counter_t *counter, void *data)
+{
+ struct perf_event_header *header = data;
+
+ counter->callback ((counter_event_t *)header, counter->user_data);
+
+ return header->size;
+}
+
+static int
+n_missing_bytes (const uint8_t *data, int n_bytes)
+{
+ const struct perf_event_header *header;
+
+ if (n_bytes < sizeof (*header))
+ return sizeof (*header) - n_bytes;
+
+ header = (const void *)data;
+
+ if (n_bytes < header->size)
+ return header->size - n_bytes;
+
+ return 0;
+}
+
+static void
+process_events (counter_t *counter, uint8_t *data, int n_bytes,
+ GString *partial)
+{
+ int n_events;
+ ssize_t n_missing;
+
+ n_events = 0;
+
+ while (n_bytes && (n_missing = n_missing_bytes (
+ (uint8_t *)partial->str, partial->len)))
+ {
+ n_missing = MIN (n_bytes, n_missing);
+
+ g_string_append_len (partial, (const char *)data, n_missing);
+
+ data += n_missing;
+ n_bytes -= n_missing;
+ }
+
+ if (partial->len)
+ {
+ int n_used;
+
+ if (n_missing_bytes ((uint8_t *)partial->str, partial->len))
+ return;
+
+ n_used = process_event (counter, partial->str);
+
+ g_assert (n_used == partial->len);
+
+ g_string_truncate (partial, 0);
+ }
+
+ while (n_bytes && !n_missing_bytes (data, n_bytes))
+ {
+ int n_used = process_event (counter, data);
+
+ data += n_used;
+ n_bytes -= n_used;
+ }
+
+ if (n_missing_bytes (data, n_bytes))
+ g_string_append_len (partial, (char *)data, n_bytes);
+}
+
+
+static void
+on_read (gpointer data)
+{
+ uint64_t head, tail;
+ counter_t *counter = data;
+ int mask = (N_PAGES * process_get_page_size() - 1);
+ uint64_t size;
+ int diff;
+
+ tail = counter->tail;
+
+ head = counter->mmap_page->data_head;
+ rmb();
+
+ diff = head - tail;
+
+ if (diff < 0)
+ {
+ g_warning ("sysprof fails at reading the buffer\n");
+
+ tail = head;
+ }
+
+ size = head - tail;
+
+ if ((tail & mask) + size != (head & mask))
+ {
+ size = mask + 1 - (tail & mask);
+
+ g_assert ((tail & mask) + size <= (N_PAGES * process_get_page_size()));
+
+ process_events (counter, counter->data + (tail & mask),
+ size, counter->partial);
+
+ tail += size;
+ }
+
+ size = head - tail;
+
+ g_assert ((tail & mask) + size <= (N_PAGES * process_get_page_size()));
+
+ process_events (counter,
+ counter->data + (tail & mask), size, counter->partial);
+
+ tail += size;
+
+ counter->tail = tail;
+ counter->mmap_page->data_tail = tail;
+}
+
+#define fail(x)
+
+static counter_t *
+counter_new (int cpu,
+ event_callback_t callback,
+ gpointer data)
+{
+ struct perf_counter_attr attr;
+ counter_t *counter;
+ int fd;
+
+ counter = g_new (counter_t, 1);
+
+ memset (&attr, 0, sizeof (attr));
+
+ attr.type = PERF_TYPE_HARDWARE;
+ attr.config = PERF_COUNT_HW_CPU_CYCLES;
+ attr.sample_period = 1200000 ; /* In number of clock cycles -
+ * use frequency instead FIXME
+ */
+ attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID | PERF_SAMPLE_CALLCHAIN;
+ attr.wakeup_events = 100000;
+ attr.disabled = TRUE;
+ attr.mmap = TRUE;
+ attr.comm = TRUE;
+
+ fd = sysprof_perf_counter_open (&attr, -1, cpu, -1, 0);
+
+ if (fd < 0)
+ {
+ fail ("perf_counter_open");
+ return NULL;
+ }
+
+ counter->fd = fd;
+ counter->mmap_page = mmap (
+ NULL, (N_PAGES + 1) * process_get_page_size(),
+ PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+
+ if (counter->mmap_page == MAP_FAILED)
+ {
+ fail ("mmap");
+ return NULL;
+ }
+
+ counter->data = (uint8_t *)counter->mmap_page + process_get_page_size ();
+ counter->tail = 0;
+ counter->cpu = cpu;
+ counter->partial = g_string_new (NULL);
+ counter->callback = callback;
+ counter->user_data = data;
+
+ fd_add_watch (fd, counter);
+ fd_set_read_callback (fd, on_read);
+
+ return counter;
+}
+
+static void
+counter_enable (counter_t *counter)
+{
+ ioctl (counter->fd, PERF_COUNTER_IOC_ENABLE);
+}
+
+static void
+counter_free (counter_t *counter)
+{
+ munmap (counter->mmap_page, (N_PAGES + 1) * process_get_page_size());
+ fd_remove_watch (counter->fd);
+
+ close (counter->fd);
+ g_string_free (counter->partial, TRUE);
+
+ g_free (counter);
+}
+
+/*
+ * Collector
+ */
+void
+collector_reset (Collector *collector)
+{
+ if (collector->stash)
+ stack_stash_unref (collector->stash);
+
+ process_flush_caches();
+
+ collector->stash = stack_stash_new (NULL);
+ collector->n_samples = 0;
+
+ g_get_current_time (&collector->latest_reset);
+}
+
/* callback is called whenever a new sample arrives */
Collector *
collector_new (CollectorFunc callback,
- gpointer data)
+ gpointer data)
{
Collector *collector = g_new0 (Collector, 1);
collector->callback = callback;
collector->data = data;
- collector->fd = -1;
collector->stash = NULL;
collector_reset (collector);
@@ -88,9 +381,9 @@ static void
add_trace_to_stash (const SysprofStackTrace *trace,
StackStash *stash)
{
- int i;
- gulong *addrs;
Process *process = process_get_from_pid (trace->pid);
+ gulong *addrs;
+ int i;
int n_addresses;
int n_kernel_words;
int a;
@@ -165,200 +458,183 @@ in_dead_period (Collector *collector)
return FALSE;
}
-
-
static void
-collect_traces (Collector *collector)
+process_mmap (Collector *collector,
+ mmap_event_t *mmap)
{
- gboolean first;
- /* After a reset we ignore samples for a short period so that
- * a reset will actually cause 'samples' to become 0
- */
- if (in_dead_period (collector))
- {
- collector->current = collector->map_area->head;
- return;
- }
-
- first = collector->n_samples == 0;
-
- while (collector->current != collector->map_area->head)
- {
- const SysprofStackTrace *trace;
-
- trace = &(collector->map_area->traces[collector->current]);
-
-#if 0
- {
- int i;
- g_print ("pid: %d (%d)\n", trace->pid, trace->n_addresses);
- for (i=0; i < trace->n_addresses; ++i)
- g_print ("rd: %08x\n", trace->addresses[i]);
- g_print ("-=-\n");
- }
-#endif
-#if 0
- {
- int i;
- g_print ("pid: %d (%d)\n", trace->pid, trace->n_addresses);
- for (i=0; i < trace->n_kernel_words; ++i)
- g_print ("rd: %08x\n", trace->kernel_stack[i]);
- g_print ("-=-\n");
- }
-#endif
-
- add_trace_to_stash (trace, collector->stash);
-
- collector->current++;
- if (collector->current >= SYSPROF_N_TRACES)
- collector->current = 0;
-
- collector->n_samples++;
- }
-
- if (collector->callback)
- collector->callback (first, collector->data);
}
static void
-on_read (gpointer data)
+process_comm (Collector *collector,
+ comm_event_t *comm)
{
- Collector *collector = data;
- char c;
- /* Make sure poll() doesn't fire immediately again */
- read (collector->fd, &c, 1);
-
- collect_traces (collector);
}
static gboolean
-load_module (void)
+is_context (uint64_t addr)
{
- int exit_status = -1;
- char *dummy1, *dummy2;
-
- if (g_spawn_command_line_sync ("/sbin/modprobe sysprof-module",
- &dummy1, &dummy2,
- &exit_status,
- NULL))
- {
- if (WIFEXITED (exit_status))
- exit_status = WEXITSTATUS (exit_status);
-
- g_free (dummy1);
- g_free (dummy2);
- }
-
- return (exit_status == 0);
+ return
+ addr == PERF_CONTEXT_HV ||
+ addr == PERF_CONTEXT_KERNEL ||
+ addr == PERF_CONTEXT_USER ||
+ addr == PERF_CONTEXT_GUEST ||
+ addr == PERF_CONTEXT_GUEST_KERNEL ||
+ addr == PERF_CONTEXT_GUEST_USER;
}
-static gboolean
-open_fd (Collector *collector,
- GError **err)
+static void
+process_sample (Collector *collector,
+ sample_event_t *sample)
{
- int fd;
- void *map_area;
-
- fd = open (SYSPROF_FILE, O_RDONLY);
- if (fd < 0)
+ Process *process = process_get_from_pid (sample->pid);
+ gboolean first = collector->n_samples == 0;
+ uint64_t context = 0;
+ gulong addrs_stack[2048];
+ gulong *addrs;
+ int n_alloc;
+ int i;
+ gulong *a;
+
+ n_alloc = sample->n_ips + 2;
+ if (n_alloc < 2048)
+ addrs = addrs_stack;
+ else
+ addrs = g_new (gulong, n_alloc);
+
+ a = addrs;
+ for (i = 0; i < sample->n_ips; ++i)
{
- if (load_module())
+ uint64_t addr = sample->ips[i];
+
+ if (is_context (addr))
{
- GTimer *timer = g_timer_new ();
-
- while (fd < 0 && g_timer_elapsed (timer, NULL) < 0.5)
+ /* FIXME: think this through */
+ if (context == PERF_CONTEXT_KERNEL)
+ *a++ = 0x01; /* kernel marker */
+
+ context = addr;
+ }
+ else
+ {
+ if (context == PERF_CONTEXT_KERNEL)
{
- /* Wait for udev to discover the new device.
- */
- usleep (100000);
-
- errno = 0;
- fd = open (SYSPROF_FILE, O_RDONLY);
+ if (process_is_kernel_address (addr))
+ *a++ = addr;
}
-
- g_timer_destroy (timer);
-
- if (fd < 0)
+ else
{
- set_cant_open_error (err, errno);
- return FALSE;
+ if (!context)
+ g_print ("no context\n");
+
+ process_ensure_map (process, sample->pid, addr);
+
+ *a++ = addr;
}
}
-
- if (fd < 0)
- {
- set_no_module_error (err);
-
- return FALSE;
- }
}
+
+ *a++ = (gulong)process;
+
+ stack_stash_add_trace (collector->stash, addrs, a - addrs, 1);
- map_area = mmap (NULL, sizeof (SysprofMmapArea),
- PROT_READ, MAP_SHARED, fd, 0);
+ collector->n_samples++;
+
+ if (collector->callback)
+ collector->callback (first, collector->data);
+
+ if (addrs != addrs_stack)
+ g_free (addrs);
+}
+
+static void
+on_event (counter_event_t * event,
+ gpointer data)
+
+{
+ Collector *collector = data;
- if (map_area == MAP_FAILED)
+ switch (event->header.type)
{
- close (fd);
- set_cant_open_error (err, errno);
+ case PERF_EVENT_MMAP:
+ process_mmap (collector, &event->mmap);
+ break;
+
+ case PERF_EVENT_LOST:
+ break;
+
+ case PERF_EVENT_COMM:
+ process_comm (collector, &event->comm);
+ break;
+
+ case PERF_EVENT_EXIT:
+ break;
+
+ case PERF_EVENT_THROTTLE:
+ break;
+
+ case PERF_EVENT_UNTHROTTLE:
+ break;
+
+ case PERF_EVENT_FORK:
+ break;
+
+ case PERF_EVENT_READ:
+ break;
+
+ case PERF_EVENT_SAMPLE:
+ process_sample (collector, &event->sample);
+ break;
- return FALSE;
+ default:
+ g_print ("unknown event: %d (%d)\n",
+ event->header.type, event->header.size);
+ break;
}
-
- collector->map_area = map_area;
- collector->current = 0;
- collector->fd = fd;
- fd_add_watch (collector->fd, collector);
-
- return TRUE;
}
gboolean
collector_start (Collector *collector,
GError **err)
{
- if (collector->fd < 0 && !open_fd (collector, err))
- return FALSE;
+ int n_cpus = get_n_cpus ();
+ GList *list;
+ int i;
+
+ for (i = 0; i < n_cpus; ++i)
+ {
+ counter_t *counter = counter_new (i, on_event, collector);
+
+ collector->counters = g_list_append (collector->counters, counter);
+ }
/* Hack to make sure we parse the kernel symbols before
* starting collection, so the parsing doesn't interfere
* with the profiling.
*/
process_is_kernel_address (0);
+
+ for (list = collector->counters; list != NULL; list = list->next)
+ counter_enable (list->data);
- fd_set_read_callback (collector->fd, on_read);
return TRUE;
}
void
collector_stop (Collector *collector)
{
- if (collector->fd >= 0)
+ GList *list;
+
+ for (list = collector->counters; list != NULL; list = list->next)
{
- fd_remove_watch (collector->fd);
+ counter_t *counter = list->data;
- munmap (collector->map_area, sizeof (SysprofMmapArea));
- collector->map_area = NULL;
- collector->current = 0;
-
- close (collector->fd);
- collector->fd = -1;
+ counter_free (counter);
}
-}
-void
-collector_reset (Collector *collector)
-{
- if (collector->stash)
- stack_stash_unref (collector->stash);
-
- process_flush_caches();
-
- collector->stash = stack_stash_new (NULL);
- collector->n_samples = 0;
-
- g_get_current_time (&collector->latest_reset);
+ g_list_free (collector->counters);
+ collector->counters = NULL;
}
int
@@ -464,7 +740,7 @@ lookup_symbol (Process *process, gpointer address,
static void
resolve_symbols (GList *trace, gint size, gpointer data)
{
- static const char *const everything = "Everything";
+ static const char *const everything = "[Everything]";
GList *list;
ResolveInfo *info = data;
Process *process = g_list_last (trace)->data;
@@ -538,31 +814,6 @@ collector_create_profile (Collector *collector)
return profile;
}
-static void
-set_no_module_error (GError **err)
-{
- g_set_error (err,
- COLLECTOR_ERROR,
- COLLECTOR_ERROR_CANT_OPEN_FILE,
- "Can't open " SYSPROF_FILE ". You need to insert "
- "the sysprof kernel module. Run\n"
- "\n"
- " modprobe sysprof-module\n"
- "\n"
- "as root");
-}
-
-static void
-set_cant_open_error (GError **err,
- int eno)
-{
- g_set_error (err,
- COLLECTOR_ERROR,
- COLLECTOR_ERROR_CANT_OPEN_FILE,
- "Can't open " SYSPROF_FILE ": %s",
- g_strerror (eno));
-}
-
GQuark
collector_error_quark (void)
{
diff --git a/perf_counter.h b/perf_counter.h
new file mode 100644
index 0000000..4d3ad31
--- /dev/null
+++ b/perf_counter.h
@@ -0,0 +1,804 @@
+/*
+ * Performance counters:
+ *
+ * Copyright (C) 2008-2009, Thomas Gleixner <tglx linutronix de>
+ * Copyright (C) 2008-2009, Red Hat, Inc., Ingo Molnar
+ * Copyright (C) 2008-2009, Red Hat, Inc., Peter Zijlstra
+ *
+ * Data type definitions, declarations, prototypes.
+ *
+ * Started by: Thomas Gleixner and Ingo Molnar
+ *
+ * For licencing details see kernel-base/COPYING
+ */
+#ifndef _LINUX_PERF_COUNTER_H
+#define _LINUX_PERF_COUNTER_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+#include <asm/byteorder.h>
+
+/*
+ * User-space ABI bits:
+ */
+
+/*
+ * attr.type
+ */
+enum perf_type_id {
+ PERF_TYPE_HARDWARE = 0,
+ PERF_TYPE_SOFTWARE = 1,
+ PERF_TYPE_TRACEPOINT = 2,
+ PERF_TYPE_HW_CACHE = 3,
+ PERF_TYPE_RAW = 4,
+
+ PERF_TYPE_MAX, /* non-ABI */
+};
+
+/*
+ * Generalized performance counter event types, used by the
+ * attr.event_id parameter of the sys_perf_counter_open()
+ * syscall:
+ */
+enum perf_hw_id {
+ /*
+ * Common hardware events, generalized by the kernel:
+ */
+ PERF_COUNT_HW_CPU_CYCLES = 0,
+ PERF_COUNT_HW_INSTRUCTIONS = 1,
+ PERF_COUNT_HW_CACHE_REFERENCES = 2,
+ PERF_COUNT_HW_CACHE_MISSES = 3,
+ PERF_COUNT_HW_BRANCH_INSTRUCTIONS = 4,
+ PERF_COUNT_HW_BRANCH_MISSES = 5,
+ PERF_COUNT_HW_BUS_CYCLES = 6,
+
+ PERF_COUNT_HW_MAX, /* non-ABI */
+};
+
+/*
+ * Generalized hardware cache counters:
+ *
+ * { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
+ * { read, write, prefetch } x
+ * { accesses, misses }
+ */
+enum perf_hw_cache_id {
+ PERF_COUNT_HW_CACHE_L1D = 0,
+ PERF_COUNT_HW_CACHE_L1I = 1,
+ PERF_COUNT_HW_CACHE_LL = 2,
+ PERF_COUNT_HW_CACHE_DTLB = 3,
+ PERF_COUNT_HW_CACHE_ITLB = 4,
+ PERF_COUNT_HW_CACHE_BPU = 5,
+
+ PERF_COUNT_HW_CACHE_MAX, /* non-ABI */
+};
+
+enum perf_hw_cache_op_id {
+ PERF_COUNT_HW_CACHE_OP_READ = 0,
+ PERF_COUNT_HW_CACHE_OP_WRITE = 1,
+ PERF_COUNT_HW_CACHE_OP_PREFETCH = 2,
+
+ PERF_COUNT_HW_CACHE_OP_MAX, /* non-ABI */
+};
+
+enum perf_hw_cache_op_result_id {
+ PERF_COUNT_HW_CACHE_RESULT_ACCESS = 0,
+ PERF_COUNT_HW_CACHE_RESULT_MISS = 1,
+
+ PERF_COUNT_HW_CACHE_RESULT_MAX, /* non-ABI */
+};
+
+/*
+ * Special "software" counters provided by the kernel, even if the hardware
+ * does not support performance counters. These counters measure various
+ * physical and sw events of the kernel (and allow the profiling of them as
+ * well):
+ */
+enum perf_sw_ids {
+ PERF_COUNT_SW_CPU_CLOCK = 0,
+ PERF_COUNT_SW_TASK_CLOCK = 1,
+ PERF_COUNT_SW_PAGE_FAULTS = 2,
+ PERF_COUNT_SW_CONTEXT_SWITCHES = 3,
+ PERF_COUNT_SW_CPU_MIGRATIONS = 4,
+ PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
+ PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
+
+ PERF_COUNT_SW_MAX, /* non-ABI */
+};
+
+/*
+ * Bits that can be set in attr.sample_type to request information
+ * in the overflow packets.
+ */
+enum perf_counter_sample_format {
+ PERF_SAMPLE_IP = 1U << 0,
+ PERF_SAMPLE_TID = 1U << 1,
+ PERF_SAMPLE_TIME = 1U << 2,
+ PERF_SAMPLE_ADDR = 1U << 3,
+ PERF_SAMPLE_READ = 1U << 4,
+ PERF_SAMPLE_CALLCHAIN = 1U << 5,
+ PERF_SAMPLE_ID = 1U << 6,
+ PERF_SAMPLE_CPU = 1U << 7,
+ PERF_SAMPLE_PERIOD = 1U << 8,
+ PERF_SAMPLE_STREAM_ID = 1U << 9,
+ PERF_SAMPLE_RAW = 1U << 10,
+
+ PERF_SAMPLE_MAX = 1U << 11, /* non-ABI */
+};
+
+/*
+ * The format of the data returned by read() on a perf counter fd,
+ * as specified by attr.read_format:
+ *
+ * struct read_format {
+ * { u64 value;
+ * { u64 time_enabled; } && PERF_FORMAT_ENABLED
+ * { u64 time_running; } && PERF_FORMAT_RUNNING
+ * { u64 id; } && PERF_FORMAT_ID
+ * } && !PERF_FORMAT_GROUP
+ *
+ * { u64 nr;
+ * { u64 time_enabled; } && PERF_FORMAT_ENABLED
+ * { u64 time_running; } && PERF_FORMAT_RUNNING
+ * { u64 value;
+ * { u64 id; } && PERF_FORMAT_ID
+ * } cntr[nr];
+ * } && PERF_FORMAT_GROUP
+ * };
+ */
+enum perf_counter_read_format {
+ PERF_FORMAT_TOTAL_TIME_ENABLED = 1U << 0,
+ PERF_FORMAT_TOTAL_TIME_RUNNING = 1U << 1,
+ PERF_FORMAT_ID = 1U << 2,
+ PERF_FORMAT_GROUP = 1U << 3,
+
+ PERF_FORMAT_MAX = 1U << 4, /* non-ABI */
+};
+
+#define PERF_ATTR_SIZE_VER0 64 /* sizeof first published struct */
+
+/*
+ * Hardware event to monitor via a performance monitoring counter:
+ */
+struct perf_counter_attr {
+
+ /*
+ * Major type: hardware/software/tracepoint/etc.
+ */
+ __u32 type;
+
+ /*
+ * Size of the attr structure, for fwd/bwd compat.
+ */
+ __u32 size;
+
+ /*
+ * Type specific configuration information.
+ */
+ __u64 config;
+
+ union {
+ __u64 sample_period;
+ __u64 sample_freq;
+ };
+
+ __u64 sample_type;
+ __u64 read_format;
+
+ __u64 disabled : 1, /* off by default */
+ inherit : 1, /* children inherit it */
+ pinned : 1, /* must always be on PMU */
+ exclusive : 1, /* only group on PMU */
+ exclude_user : 1, /* don't count user */
+ exclude_kernel : 1, /* ditto kernel */
+ exclude_hv : 1, /* ditto hypervisor */
+ exclude_idle : 1, /* don't count when idle */
+ mmap : 1, /* include mmap data */
+ comm : 1, /* include comm data */
+ freq : 1, /* use freq, not period */
+ inherit_stat : 1, /* per task counts */
+ enable_on_exec : 1, /* next exec enables */
+ task : 1, /* trace fork/exit */
+
+ __reserved_1 : 50;
+
+ __u32 wakeup_events; /* wakeup every n events */
+ __u32 __reserved_2;
+
+ __u64 __reserved_3;
+};
+
+/*
+ * Ioctls that can be done on a perf counter fd:
+ */
+#define PERF_COUNTER_IOC_ENABLE _IO ('$', 0)
+#define PERF_COUNTER_IOC_DISABLE _IO ('$', 1)
+#define PERF_COUNTER_IOC_REFRESH _IO ('$', 2)
+#define PERF_COUNTER_IOC_RESET _IO ('$', 3)
+#define PERF_COUNTER_IOC_PERIOD _IOW('$', 4, u64)
+
+enum perf_counter_ioc_flags {
+ PERF_IOC_FLAG_GROUP = 1U << 0,
+};
+
+/*
+ * Structure of the page that can be mapped via mmap
+ */
+struct perf_counter_mmap_page {
+ __u32 version; /* version number of this structure */
+ __u32 compat_version; /* lowest version this is compat with */
+
+ /*
+ * Bits needed to read the hw counters in user-space.
+ *
+ * u32 seq;
+ * s64 count;
+ *
+ * do {
+ * seq = pc->lock;
+ *
+ * barrier()
+ * if (pc->index) {
+ * count = pmc_read(pc->index - 1);
+ * count += pc->offset;
+ * } else
+ * goto regular_read;
+ *
+ * barrier();
+ * } while (pc->lock != seq);
+ *
+ * NOTE: for obvious reason this only works on self-monitoring
+ * processes.
+ */
+ __u32 lock; /* seqlock for synchronization */
+ __u32 index; /* hardware counter identifier */
+ __s64 offset; /* add to hardware counter value */
+ __u64 time_enabled; /* time counter active */
+ __u64 time_running; /* time counter on cpu */
+
+ /*
+ * Hole for extension of the self monitor capabilities
+ */
+
+ __u64 __reserved[123]; /* align to 1k */
+
+ /*
+ * Control data for the mmap() data buffer.
+ *
+ * User-space reading the @data_head value should issue an rmb(), on
+ * SMP capable platforms, after reading this value -- see
+ * perf_counter_wakeup().
+ *
+ * When the mapping is PROT_WRITE the @data_tail value should be
+ * written by userspace to reflect the last read data. In this case
+ * the kernel will not over-write unread data.
+ */
+ __u64 data_head; /* head in the data section */
+ __u64 data_tail; /* user-space written tail */
+};
+
+#define PERF_EVENT_MISC_CPUMODE_MASK (3 << 0)
+#define PERF_EVENT_MISC_CPUMODE_UNKNOWN (0 << 0)
+#define PERF_EVENT_MISC_KERNEL (1 << 0)
+#define PERF_EVENT_MISC_USER (2 << 0)
+#define PERF_EVENT_MISC_HYPERVISOR (3 << 0)
+
+struct perf_event_header {
+ __u32 type;
+ __u16 misc;
+ __u16 size;
+};
+
+enum perf_event_type {
+
+ /*
+ * The MMAP events record the PROT_EXEC mappings so that we can
+ * correlate userspace IPs to code. They have the following structure:
+ *
+ * struct {
+ * struct perf_event_header header;
+ *
+ * u32 pid, tid;
+ * u64 addr;
+ * u64 len;
+ * u64 pgoff;
+ * char filename[];
+ * };
+ */
+ PERF_EVENT_MMAP = 1,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u64 id;
+ * u64 lost;
+ * };
+ */
+ PERF_EVENT_LOST = 2,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ *
+ * u32 pid, tid;
+ * char comm[];
+ * };
+ */
+ PERF_EVENT_COMM = 3,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u32 pid, ppid;
+ * u32 tid, ptid;
+ * };
+ */
+ PERF_EVENT_EXIT = 4,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u64 time;
+ * u64 id;
+ * u64 stream_id;
+ * };
+ */
+ PERF_EVENT_THROTTLE = 5,
+ PERF_EVENT_UNTHROTTLE = 6,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u32 pid, ppid;
+ * u32 tid, ptid;
+ * };
+ */
+ PERF_EVENT_FORK = 7,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u32 pid, tid;
+ *
+ * struct read_format values;
+ * };
+ */
+ PERF_EVENT_READ = 8,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ *
+ * { u64 ip; } && PERF_SAMPLE_IP
+ * { u32 pid, tid; } && PERF_SAMPLE_TID
+ * { u64 time; } && PERF_SAMPLE_TIME
+ * { u64 addr; } && PERF_SAMPLE_ADDR
+ * { u64 id; } && PERF_SAMPLE_ID
+ * { u64 stream_id;} && PERF_SAMPLE_STREAM_ID
+ * { u32 cpu, res; } && PERF_SAMPLE_CPU
+ * { u64 period; } && PERF_SAMPLE_PERIOD
+ *
+ * { struct read_format values; } && PERF_SAMPLE_READ
+ *
+ * { u64 nr,
+ * u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
+ *
+ * #
+ * # The RAW record below is opaque data wrt the ABI
+ * #
+ * # That is, the ABI doesn't make any promises wrt to
+ * # the stability of its content, it may vary depending
+ * # on event, hardware, kernel version and phase of
+ * # the moon.
+ * #
+ * # In other words, PERF_SAMPLE_RAW contents are not an ABI.
+ * #
+ *
+ * { u32 size;
+ * char data[size];}&& PERF_SAMPLE_RAW
+ * };
+ */
+ PERF_EVENT_SAMPLE = 9,
+
+ PERF_EVENT_MAX, /* non-ABI */
+};
+
+enum perf_callchain_context {
+ PERF_CONTEXT_HV = (__u64)-32,
+ PERF_CONTEXT_KERNEL = (__u64)-128,
+ PERF_CONTEXT_USER = (__u64)-512,
+
+ PERF_CONTEXT_GUEST = (__u64)-2048,
+ PERF_CONTEXT_GUEST_KERNEL = (__u64)-2176,
+ PERF_CONTEXT_GUEST_USER = (__u64)-2560,
+
+ PERF_CONTEXT_MAX = (__u64)-4095,
+};
+
+
+
+
+
+#ifdef __KERNEL__
+/*
+ * Kernel-internal data types and definitions:
+ */
+
+#ifdef CONFIG_PERF_COUNTERS
+# include <asm/perf_counter.h>
+#endif
+
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/rculist.h>
+#include <linux/rcupdate.h>
+#include <linux/spinlock.h>
+#include <linux/hrtimer.h>
+#include <linux/fs.h>
+#include <linux/pid_namespace.h>
+#include <asm/atomic.h>
+
+#define PERF_MAX_STACK_DEPTH 255
+
+struct perf_callchain_entry {
+ __u64 nr;
+ __u64 ip[PERF_MAX_STACK_DEPTH];
+};
+
+struct perf_raw_record {
+ u32 size;
+ void *data;
+};
+
+struct task_struct;
+
+/**
+ * struct hw_perf_counter - performance counter hardware details:
+ */
+struct hw_perf_counter {
+#ifdef CONFIG_PERF_COUNTERS
+ union {
+ struct { /* hardware */
+ u64 config;
+ unsigned long config_base;
+ unsigned long counter_base;
+ int idx;
+ };
+ union { /* software */
+ atomic64_t count;
+ struct hrtimer hrtimer;
+ };
+ };
+ atomic64_t prev_count;
+ u64 sample_period;
+ u64 last_period;
+ atomic64_t period_left;
+ u64 interrupts;
+
+ u64 freq_count;
+ u64 freq_interrupts;
+ u64 freq_stamp;
+#endif
+};
+
+struct perf_counter;
+
+/**
+ * struct pmu - generic performance monitoring unit
+ */
+struct pmu {
+ int (*enable) (struct perf_counter *counter);
+ void (*disable) (struct perf_counter *counter);
+ void (*read) (struct perf_counter *counter);
+ void (*unthrottle) (struct perf_counter *counter);
+};
+
+/**
+ * enum perf_counter_active_state - the states of a counter
+ */
+enum perf_counter_active_state {
+ PERF_COUNTER_STATE_ERROR = -2,
+ PERF_COUNTER_STATE_OFF = -1,
+ PERF_COUNTER_STATE_INACTIVE = 0,
+ PERF_COUNTER_STATE_ACTIVE = 1,
+};
+
+struct file;
+
+struct perf_mmap_data {
+ struct rcu_head rcu_head;
+ int nr_pages; /* nr of data pages */
+ int writable; /* are we writable */
+ int nr_locked; /* nr pages mlocked */
+
+ atomic_t poll; /* POLL_ for wakeups */
+ atomic_t events; /* event limit */
+
+ atomic_long_t head; /* write position */
+ atomic_long_t done_head; /* completed head */
+
+ atomic_t lock; /* concurrent writes */
+ atomic_t wakeup; /* needs a wakeup */
+ atomic_t lost; /* nr records lost */
+
+ struct perf_counter_mmap_page *user_page;
+ void *data_pages[0];
+};
+
+struct perf_pending_entry {
+ struct perf_pending_entry *next;
+ void (*func)(struct perf_pending_entry *);
+};
+
+/**
+ * struct perf_counter - performance counter kernel representation:
+ */
+struct perf_counter {
+#ifdef CONFIG_PERF_COUNTERS
+ struct list_head list_entry;
+ struct list_head event_entry;
+ struct list_head sibling_list;
+ int nr_siblings;
+ struct perf_counter *group_leader;
+ const struct pmu *pmu;
+
+ enum perf_counter_active_state state;
+ atomic64_t count;
+
+ /*
+ * These are the total time in nanoseconds that the counter
+ * has been enabled (i.e. eligible to run, and the task has
+ * been scheduled in, if this is a per-task counter)
+ * and running (scheduled onto the CPU), respectively.
+ *
+ * They are computed from tstamp_enabled, tstamp_running and
+ * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
+ */
+ u64 total_time_enabled;
+ u64 total_time_running;
+
+ /*
+ * These are timestamps used for computing total_time_enabled
+ * and total_time_running when the counter is in INACTIVE or
+ * ACTIVE state, measured in nanoseconds from an arbitrary point
+ * in time.
+ * tstamp_enabled: the notional time when the counter was enabled
+ * tstamp_running: the notional time when the counter was scheduled on
+ * tstamp_stopped: in INACTIVE state, the notional time when the
+ * counter was scheduled off.
+ */
+ u64 tstamp_enabled;
+ u64 tstamp_running;
+ u64 tstamp_stopped;
+
+ struct perf_counter_attr attr;
+ struct hw_perf_counter hw;
+
+ struct perf_counter_context *ctx;
+ struct file *filp;
+
+ /*
+ * These accumulate total time (in nanoseconds) that children
+ * counters have been enabled and running, respectively.
+ */
+ atomic64_t child_total_time_enabled;
+ atomic64_t child_total_time_running;
+
+ /*
+ * Protect attach/detach and child_list:
+ */
+ struct mutex child_mutex;
+ struct list_head child_list;
+ struct perf_counter *parent;
+
+ int oncpu;
+ int cpu;
+
+ struct list_head owner_entry;
+ struct task_struct *owner;
+
+ /* mmap bits */
+ struct mutex mmap_mutex;
+ atomic_t mmap_count;
+ struct perf_mmap_data *data;
+
+ /* poll related */
+ wait_queue_head_t waitq;
+ struct fasync_struct *fasync;
+
+ /* delayed work for NMIs and such */
+ int pending_wakeup;
+ int pending_kill;
+ int pending_disable;
+ struct perf_pending_entry pending;
+
+ atomic_t event_limit;
+
+ void (*destroy)(struct perf_counter *);
+ struct rcu_head rcu_head;
+
+ struct pid_namespace *ns;
+ u64 id;
+#endif
+};
+
+/**
+ * struct perf_counter_context - counter context structure
+ *
+ * Used as a container for task counters and CPU counters as well:
+ */
+struct perf_counter_context {
+ /*
+ * Protect the states of the counters in the list,
+ * nr_active, and the list:
+ */
+ spinlock_t lock;
+ /*
+ * Protect the list of counters. Locking either mutex or lock
+ * is sufficient to ensure the list doesn't change; to change
+ * the list you need to lock both the mutex and the spinlock.
+ */
+ struct mutex mutex;
+
+ struct list_head counter_list;
+ struct list_head event_list;
+ int nr_counters;
+ int nr_active;
+ int is_active;
+ int nr_stat;
+ atomic_t refcount;
+ struct task_struct *task;
+
+ /*
+ * Context clock, runs when context enabled.
+ */
+ u64 time;
+ u64 timestamp;
+
+ /*
+ * These fields let us detect when two contexts have both
+ * been cloned (inherited) from a common ancestor.
+ */
+ struct perf_counter_context *parent_ctx;
+ u64 parent_gen;
+ u64 generation;
+ int pin_count;
+ struct rcu_head rcu_head;
+};
+
+/**
+ * struct perf_counter_cpu_context - per cpu counter context structure
+ */
+struct perf_cpu_context {
+ struct perf_counter_context ctx;
+ struct perf_counter_context *task_ctx;
+ int active_oncpu;
+ int max_pertask;
+ int exclusive;
+
+ /*
+ * Recursion avoidance:
+ *
+ * task, softirq, irq, nmi context
+ */
+ int recursion[4];
+};
+
+#ifdef CONFIG_PERF_COUNTERS
+
+/*
+ * Set by architecture code:
+ */
+extern int perf_max_counters;
+
+extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
+
+extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
+extern void perf_counter_task_sched_out(struct task_struct *task,
+ struct task_struct *next, int cpu);
+extern void perf_counter_task_tick(struct task_struct *task, int cpu);
+extern int perf_counter_init_task(struct task_struct *child);
+extern void perf_counter_exit_task(struct task_struct *child);
+extern void perf_counter_free_task(struct task_struct *task);
+extern void set_perf_counter_pending(void);
+extern void perf_counter_do_pending(void);
+extern void perf_counter_print_debug(void);
+extern void __perf_disable(void);
+extern bool __perf_enable(void);
+extern void perf_disable(void);
+extern void perf_enable(void);
+extern int perf_counter_task_disable(void);
+extern int perf_counter_task_enable(void);
+extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
+ struct perf_cpu_context *cpuctx,
+ struct perf_counter_context *ctx, int cpu);
+extern void perf_counter_update_userpage(struct perf_counter *counter);
+
+struct perf_sample_data {
+ struct pt_regs *regs;
+ u64 addr;
+ u64 period;
+ struct perf_raw_record *raw;
+};
+
+extern int perf_counter_overflow(struct perf_counter *counter, int nmi,
+ struct perf_sample_data *data);
+extern void perf_counter_output(struct perf_counter *counter, int nmi,
+ struct perf_sample_data *data);
+
+/*
+ * Return 1 for a software counter, 0 for a hardware counter
+ */
+static inline int is_software_counter(struct perf_counter *counter)
+{
+ return (counter->attr.type != PERF_TYPE_RAW) &&
+ (counter->attr.type != PERF_TYPE_HARDWARE) &&
+ (counter->attr.type != PERF_TYPE_HW_CACHE);
+}
+
+extern atomic_t perf_swcounter_enabled[PERF_COUNT_SW_MAX];
+
+extern void __perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
+
+static inline void
+perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
+{
+ if (atomic_read(&perf_swcounter_enabled[event]))
+ __perf_swcounter_event(event, nr, nmi, regs, addr);
+}
+
+extern void __perf_counter_mmap(struct vm_area_struct *vma);
+
+static inline void perf_counter_mmap(struct vm_area_struct *vma)
+{
+ if (vma->vm_flags & VM_EXEC)
+ __perf_counter_mmap(vma);
+}
+
+extern void perf_counter_comm(struct task_struct *tsk);
+extern void perf_counter_fork(struct task_struct *tsk);
+
+extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
+
+extern int sysctl_perf_counter_paranoid;
+extern int sysctl_perf_counter_mlock;
+extern int sysctl_perf_counter_sample_rate;
+
+extern void perf_counter_init(void);
+
+#ifndef perf_misc_flags
+#define perf_misc_flags(regs) (user_mode(regs) ? PERF_EVENT_MISC_USER : \
+ PERF_EVENT_MISC_KERNEL)
+#define perf_instruction_pointer(regs) instruction_pointer(regs)
+#endif
+
+#else
+static inline void
+perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
+static inline void
+perf_counter_task_sched_out(struct task_struct *task,
+ struct task_struct *next, int cpu) { }
+static inline void
+perf_counter_task_tick(struct task_struct *task, int cpu) { }
+static inline int perf_counter_init_task(struct task_struct *child) { return 0; }
+static inline void perf_counter_exit_task(struct task_struct *child) { }
+static inline void perf_counter_free_task(struct task_struct *task) { }
+static inline void perf_counter_do_pending(void) { }
+static inline void perf_counter_print_debug(void) { }
+static inline void perf_disable(void) { }
+static inline void perf_enable(void) { }
+static inline int perf_counter_task_disable(void) { return -EINVAL; }
+static inline int perf_counter_task_enable(void) { return -EINVAL; }
+
+static inline void
+perf_swcounter_event(u32 event, u64 nr, int nmi,
+ struct pt_regs *regs, u64 addr) { }
+
+static inline void perf_counter_mmap(struct vm_area_struct *vma) { }
+static inline void perf_counter_comm(struct task_struct *tsk) { }
+static inline void perf_counter_fork(struct task_struct *tsk) { }
+static inline void perf_counter_init(void) { }
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* _LINUX_PERF_COUNTER_H */
diff --git a/process.c b/process.c
index 45b45d9..c9c8776 100644
--- a/process.c
+++ b/process.c
@@ -296,8 +296,8 @@ process_has_page (Process *process, gulong addr)
return FALSE;
}
-static int
-page_size (void)
+int
+process_get_page_size (void)
{
static int page_size;
static gboolean has_page_size = FALSE;
@@ -316,7 +316,7 @@ process_ensure_map (Process *process, int pid, gulong addr)
{
/* Round down to closest page */
- addr = (addr - addr % page_size());
+ addr = (addr - addr % process_get_page_size());
if (process_has_page (process, addr))
return;
@@ -678,7 +678,7 @@ process_lookup_kernel_symbol (gulong address,
const char *
process_lookup_symbol (Process *process, gulong address, gulong *offset)
{
- static const char *const kernel = "kernel";
+ static const char *const kernel = "[kernel]";
const BinSymbol *result;
Map *map = process_locate_map (process, address);
@@ -756,7 +756,9 @@ process_lookup_symbol (Process *process, gulong address, gulong *offset)
g_print (" ---> %s\n", result->name);
#endif
-/* g_print ("(%x) %x %x name; %s\n", address, map->start, map->offset, result->name); */
+/* g_print ("(%x) %x %x name; %s\n", address, map->start,
+ * map->offset, result->name);
+ */
#if 0
g_print ("name: %s (in %s)\n", bin_symbol_get_name (map->bin_file, result), map->filename);
diff --git a/process.h b/process.h
index a72714c..21faf4d 100644
--- a/process.h
+++ b/process.h
@@ -60,5 +60,6 @@ const guint8 *process_get_vdso_bytes (gsize *length);
gboolean process_is_kernel_address (gulong address);
const char * process_lookup_kernel_symbol (gulong address,
gulong *offset);
+int process_get_page_size (void);
#endif
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