fs/f2fs/trace.c

   1 /*
   2  * f2fs IO tracer
   3  *
   4  * Copyright (c) 2014 Motorola Mobility
   5  * Copyright (c) 2014 Jaegeuk Kim <jaegeuk@kernel.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/fs.h>
  12 #include <linux/f2fs_fs.h>
  13 #include <linux/sched.h>
  14
  15 #include "f2fs.h"
  16 #include "trace.h"
  17
  18 RADIX_TREE(pids, GFP_ATOMIC);
  19 spinlock_t pids_lock;
  20 struct last_io_info last_io;
  21
  22 static inline void __print_last_io(void)
  23 {
  24         if (!last_io.len)
  25                 return;
  26
  27         trace_printk("%3x:%3x %4x %-16s %2x %5x %12x %4x\n",
  28                         last_io.major, last_io.minor,
  29                         last_io.pid, "----------------",
  30                         last_io.type,
  31                         last_io.fio.rw, last_io.fio.blk_addr,
  32                         last_io.len);
  33         memset(&last_io, 0, sizeof(last_io));
  34 }
  35
  36 static int __file_type(struct inode *inode, pid_t pid)
  37 {
  38         if (f2fs_is_atomic_file(inode))
  39                 return __ATOMIC_FILE;
  40         else if (f2fs_is_volatile_file(inode))
  41                 return __VOLATILE_FILE;
  42         else if (S_ISDIR(inode->i_mode))
  43                 return __DIR_FILE;
  44         else if (inode->i_ino == F2FS_NODE_INO(F2FS_I_SB(inode)))
  45                 return __NODE_FILE;
  46         else if (inode->i_ino == F2FS_META_INO(F2FS_I_SB(inode)))
  47                 return __META_FILE;
  48         else if (pid)
  49                 return __NORMAL_FILE;
  50         else
  51                 return __MISC_FILE;
  52 }
  53
  54 void f2fs_trace_pid(struct page *page)
  55 {
  56         struct inode *inode = page->mapping->host;
  57         pid_t pid = task_pid_nr(current);
  58         void *p;
  59
  60         page->private = pid;
  61
  62         if (radix_tree_preload(GFP_NOFS))
  63                 return;
  64
  65         spin_lock(&pids_lock);
  66         p = radix_tree_lookup(&pids, pid);
  67         if (p == current)
  68                 goto out;
  69         if (p)
  70                 radix_tree_delete(&pids, pid);
  71
  72         f2fs_radix_tree_insert(&pids, pid, current);
  73
  74         trace_printk("%3x:%3x %4x %-16s\n",
  75                         MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev),
  76                         pid, current->comm);
  77 out:
  78         spin_unlock(&pids_lock);
  79         radix_tree_preload_end();
  80 }
  81
  82 void f2fs_trace_ios(struct page *page, struct f2fs_io_info *fio, int flush)
  83 {
  84         struct inode *inode;
  85         pid_t pid;
  86         int major, minor;
  87
  88         if (flush) {
  89                 __print_last_io();
  90                 return;
  91         }
  92
  93         inode = page->mapping->host;
  94         pid = page_private(page);
  95
  96         major = MAJOR(inode->i_sb->s_dev);
  97         minor = MINOR(inode->i_sb->s_dev);
  98
  99         if (last_io.major == major && last_io.minor == minor &&
 100                         last_io.pid == pid &&
 101                         last_io.type == __file_type(inode, pid) &&
 102                         last_io.fio.rw == fio->rw &&
 103                         last_io.fio.blk_addr + last_io.len == fio->blk_addr) {
 104                 last_io.len++;
 105                 return;
 106         }
 107
 108         __print_last_io();
 109
 110         last_io.major = major;
 111         last_io.minor = minor;
 112         last_io.pid = pid;
 113         last_io.type = __file_type(inode, pid);
 114         last_io.fio = *fio;
 115         last_io.len = 1;
 116         return;
 117 }
 118
 119 void f2fs_build_trace_ios(void)
 120 {
 121         spin_lock_init(&pids_lock);
 122 }