ia64/linux-2.6.18-xen.hg

view drivers/oprofile/oprofile_stats.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /**
2 * @file oprofile_stats.c
3 *
4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
6 *
7 * @author John Levon
8 */
10 #include <linux/oprofile.h>
11 #include <linux/smp.h>
12 #include <linux/cpumask.h>
13 #include <linux/threads.h>
15 #include "oprofile_stats.h"
16 #include "cpu_buffer.h"
18 struct oprofile_stat_struct oprofile_stats;
20 void oprofile_reset_stats(void)
21 {
22 struct oprofile_cpu_buffer * cpu_buf;
23 int i;
25 for_each_possible_cpu(i) {
26 cpu_buf = &cpu_buffer[i];
27 cpu_buf->sample_received = 0;
28 cpu_buf->sample_lost_overflow = 0;
29 }
31 atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
32 atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
33 atomic_set(&oprofile_stats.event_lost_overflow, 0);
34 }
37 void oprofile_create_stats_files(struct super_block * sb, struct dentry * root)
38 {
39 struct oprofile_cpu_buffer * cpu_buf;
40 struct dentry * cpudir;
41 struct dentry * dir;
42 char buf[10];
43 int i;
45 dir = oprofilefs_mkdir(sb, root, "stats");
46 if (!dir)
47 return;
49 for_each_possible_cpu(i) {
50 cpu_buf = &cpu_buffer[i];
51 snprintf(buf, 10, "cpu%d", i);
52 cpudir = oprofilefs_mkdir(sb, dir, buf);
54 /* Strictly speaking access to these ulongs is racy,
55 * but we can't simply lock them, and they are
56 * informational only.
57 */
58 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
59 &cpu_buf->sample_received);
60 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
61 &cpu_buf->sample_lost_overflow);
62 oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
63 &cpu_buf->backtrace_aborted);
64 }
66 oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
67 &oprofile_stats.sample_lost_no_mm);
68 oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
69 &oprofile_stats.sample_lost_no_mapping);
70 oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
71 &oprofile_stats.event_lost_overflow);
72 oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
73 &oprofile_stats.bt_lost_no_mapping);
74 }