tracing: profile likely and unlikely annotations

Impact: new unlikely/likely profiler

Andrew Morton recently suggested having an in-kernel way to profile
likely and unlikely macros. This patch achieves that goal.

When configured, every(*) likely and unlikely macro gets a counter attached
to it. When the condition is hit, the hit and misses of that condition
are recorded. These numbers can later be retrieved by:

  /debugfs/tracing/profile_likely    - All likely markers
  /debugfs/tracing/profile_unlikely  - All unlikely markers.

# cat /debug/tracing/profile_unlikely | head
 correct incorrect  %        Function                  File              Line
 ------- ---------  -        --------                  ----              ----
    2167        0   0 do_arch_prctl                  process_64.c         832
       0        0   0 do_arch_prctl                  process_64.c         804
    2670        0   0 IS_ERR                         err.h                34
   71230     5693   7 __switch_to                    process_64.c         673
   76919        0   0 __switch_to                    process_64.c         639
   43184    33743  43 __switch_to                    process_64.c         624
   12740    64181  83 __switch_to                    process_64.c         594
   12740    64174  83 __switch_to                    process_64.c         590

# cat /debug/tracing/profile_unlikely | \
  awk '{ if ($3 > 25) print $0; }' |head -20
   44963    35259  43 __switch_to                    process_64.c         624
   12762    67454  84 __switch_to                    process_64.c         594
   12762    67447  84 __switch_to                    process_64.c         590
    1478      595  28 syscall_get_error              syscall.h            51
       0     2821 100 syscall_trace_leave            ptrace.c             1567
       0        1 100 native_smp_prepare_cpus        smpboot.c            1237
   86338   265881  75 calc_delta_fair                sched_fair.c         408
  210410   108540  34 calc_delta_mine                sched.c              1267
       0    54550 100 sched_info_queued              sched_stats.h        222
   51899    66435  56 pick_next_task_fair            sched_fair.c         1422
       6       10  62 yield_task_fair                sched_fair.c         982
    7325     2692  26 rt_policy                      sched.c              144
       0     1270 100 pre_schedule_rt                sched_rt.c           1261
    1268    48073  97 pick_next_task_rt              sched_rt.c           884
       0    45181 100 sched_info_dequeued            sched_stats.h        177
       0       15 100 sched_move_task                sched.c              8700
       0       15 100 sched_move_task                sched.c              8690
   53167    33217  38 schedule                       sched.c              4457
       0    80208 100 sched_info_switch              sched_stats.h        270
   30585    49631  61 context_switch                 sched.c              2619

# cat /debug/tracing/profile_likely | awk '{ if ($3 > 25) print $0; }'
   39900    36577  47 pick_next_task                 sched.c              4397
   20824    15233  42 switch_mm                      mmu_context_64.h     18
       0        7 100 __cancel_work_timer            workqueue.c          560
     617    66484  99 clocksource_adjust             timekeeping.c        456
       0   346340 100 audit_syscall_exit             auditsc.c            1570
      38   347350  99 audit_get_context              auditsc.c            732
       0   345244 100 audit_syscall_entry            auditsc.c            1541
      38     1017  96 audit_free                     auditsc.c            1446
       0     1090 100 audit_alloc                    auditsc.c            862
    2618     1090  29 audit_alloc                    auditsc.c            858
       0        6 100 move_masked_irq                migration.c          9
       1      198  99 probe_sched_wakeup             trace_sched_switch.c 58
       2        2  50 probe_wakeup                   trace_sched_wakeup.c 227
       0        2 100 probe_wakeup_sched_switch      trace_sched_wakeup.c 144
    4514     2090  31 __grab_cache_page              filemap.c            2149
   12882   228786  94 mapping_unevictable            pagemap.h            50
       4       11  73 __flush_cpu_slab               slub.c               1466
  627757   330451  34 slab_free                      slub.c               1731
    2959    61245  95 dentry_lru_del_init            dcache.c             153
     946     1217  56 load_elf_binary                binfmt_elf.c         904
     102       82  44 disk_put_part                  genhd.h              206
       1        1  50 dst_gc_task                    dst.c                82
       0       19 100 tcp_mss_split_point            tcp_output.c         1126

As you can see by the above, there's a bit of work to do in rethinking
the use of some unlikelys and likelys. Note: the unlikely case had 71 hits
that were more than 25%.

Note:  After submitting my first version of this patch, Andrew Morton
  showed me a version written by Daniel Walker, where I picked up
  the following ideas from:

  1)  Using __builtin_constant_p to avoid profiling fixed values.
  2)  Using __FILE__ instead of instruction pointers.
  3)  Using the preprocessor to stop all profiling of likely
       annotations from vsyscall_64.c.

Thanks to Andrew Morton, Arjan van de Ven, Theodore Tso and Ingo Molnar
for their feed back on this patch.

(*) Not ever unlikely is recorded, those that are used by vsyscalls
 (a few of them) had to have profiling disabled.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Theodore Tso <tytso@mit.edu>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 164 insertions, 0 deletions

diff --git a/kernel/trace/trace_unlikely.c b/kernel/trace/trace_unlikely.c
new file mode 100644
index 00000000000..94932696069
--- /dev/null
+++ b/kernel/trace/trace_unlikely.c
@@ -0,0 +1,164 @@
+/*
+ * unlikely profiler
+ *
+ * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
+ */
+#include <linux/kallsyms.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/ftrace.h>
+#include <linux/hash.h>
+#include <linux/fs.h>
+#include <asm/local.h>
+#include "trace.h"
+
+void ftrace_likely_update(struct ftrace_likely_data *f, int val, int expect)
+{
+        /* FIXME: Make this atomic! */
+        if (val == expect)
+                f->correct++;
+        else
+                f->incorrect++;
+}
+EXPORT_SYMBOL(ftrace_likely_update);
+
+struct ftrace_pointer {
+        void            *start;
+        void            *stop;
+};
+
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        struct ftrace_pointer *f = m->private;
+        struct ftrace_likely_data *p = v;
+
+        (*pos)++;
+
+        if (v == (void *)1)
+                return f->start;
+
+        ++p;
+
+        if ((void *)p >= (void *)f->stop)
+                return NULL;
+
+        return p;
+}
+
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
+        void *t = (void *)1;
+        loff_t l = 0;
+
+        for (; t && l < *pos; t = t_next(m, t, &l))
+                ;
+
+        return t;
+}
+
+static void t_stop(struct seq_file *m, void *p)
+{
+}
+
+static int t_show(struct seq_file *m, void *v)
+{
+        struct ftrace_likely_data *p = v;
+        const char *f;
+        unsigned long percent;
+
+        if (v == (void *)1) {
+                seq_printf(m, " correct incorrect  %% "
+                              "       Function                "
+                              "  File              Line\n"
+                              " ------- ---------  - "
+                              "       --------                "
+                              "  ----              ----\n");
+                return 0;
+        }
+
+        /* Only print the file, not the path */
+        f = p->file + strlen(p->file);
+        while (f >= p->file && *f != '/')
+                f--;
+        f++;
+
+        if (p->correct) {
+                percent = p->incorrect * 100;
+                percent /= p->correct + p->incorrect;
+        } else
+                percent = p->incorrect ? 100 : 0;
+
+        seq_printf(m, "%8lu %8lu %3lu ", p->correct, p->incorrect, percent);
+        seq_printf(m, "%-30.30s %-20.20s %d\n", p->func, f, p->line);
+        return 0;
+}
+
+static struct seq_operations tracing_likely_seq_ops = {
+        .start          = t_start,
+        .next           = t_next,
+        .stop           = t_stop,
+        .show           = t_show,
+};
+
+static int tracing_likely_open(struct inode *inode, struct file *file)
+{
+        int ret;
+
+        ret = seq_open(file, &tracing_likely_seq_ops);
+        if (!ret) {
+                struct seq_file *m = file->private_data;
+                m->private = (void *)inode->i_private;
+        }
+
+        return ret;
+}
+
+static struct file_operations tracing_likely_fops = {
+        .open           = tracing_likely_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+};
+
+extern unsigned long __start_likely_profile[];
+extern unsigned long __stop_likely_profile[];
+extern unsigned long __start_unlikely_profile[];
+extern unsigned long __stop_unlikely_profile[];
+
+static struct ftrace_pointer ftrace_likely_pos = {
+        .start                  = __start_likely_profile,
+        .stop                   = __stop_likely_profile,
+};
+
+static struct ftrace_pointer ftrace_unlikely_pos = {
+        .start                  = __start_unlikely_profile,
+        .stop                   = __stop_unlikely_profile,
+};
+
+static __init int ftrace_unlikely_init(void)
+{
+        struct dentry *d_tracer;
+        struct dentry *entry;
+
+        d_tracer = tracing_init_dentry();
+
+        entry = debugfs_create_file("profile_likely", 0444, d_tracer,
+                                    &ftrace_likely_pos,
+                                    &tracing_likely_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs 'profile_likely' entry\n");
+
+        entry = debugfs_create_file("profile_unlikely", 0444, d_tracer,
+                                    &ftrace_unlikely_pos,
+                                    &tracing_likely_fops);
+        if (!entry)
+                pr_warning("Could not create debugfs"
+                           " 'profile_unlikely' entry\n");
+
+        return 0;
+}
+
+device_initcall(ftrace_unlikely_init);