Commit 0e689d03 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: add key functions for f2fs_io_tracer

This patch adds two key functions to trace process ids and IOs.
The basic idea is to
1. remain process ids, pids, in page->private.
2. show pids in IO traces.

So, later we can retrieve process information according to IO traces.
Signed-off-by: default avatarJaegeuk Kim <>
parent 63f92ddc
......@@ -15,10 +15,96 @@
#include "f2fs.h"
#include "trace.h"
struct last_io_info last_io;
static inline void __print_last_io(void)
if (!last_io.len)
trace_printk("%3x:%3x %4x %-16s %2x %5x %12x %4x\n",
last_io.major, last_io.minor,, "----------------",
last_io.type,, last_io.fio.blk_addr,
memset(&last_io, 0, sizeof(last_io));
static int __file_type(struct inode *inode, pid_t pid)
if (f2fs_is_atomic_file(inode))
return __ATOMIC_FILE;
else if (f2fs_is_volatile_file(inode))
else if (S_ISDIR(inode->i_mode))
return __DIR_FILE;
else if (inode->i_ino == F2FS_NODE_INO(F2FS_I_SB(inode)))
return __NODE_FILE;
else if (inode->i_ino == F2FS_META_INO(F2FS_I_SB(inode)))
return __META_FILE;
else if (pid)
return __NORMAL_FILE;
return __MISC_FILE;
void f2fs_trace_pid(struct page *page)
struct inode *inode = page->mapping->host;
pid_t pid = task_pid_nr(current);
void *p;
page->private = pid;
p = radix_tree_lookup(&pids, pid);
if (p == current)
if (p)
radix_tree_delete(&pids, pid);
f2fs_radix_tree_insert(&pids, pid, current);
trace_printk("%3x:%3x %4x %-16s\n",
MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev),
pid, current->comm);
void f2fs_trace_ios(struct page *page, struct f2fs_io_info *fio, int flush)
struct inode *inode;
pid_t pid;
int major, minor;
if (flush) {
inode = page->mapping->host;
pid = page_private(page);
major = MAJOR(inode->i_sb->s_dev);
minor = MINOR(inode->i_sb->s_dev);
if (last_io.major == major && last_io.minor == minor && == pid &&
last_io.type == __file_type(inode, pid) && == fio->rw &&
last_io.fio.blk_addr + last_io.len == fio->blk_addr) {
last_io.major = major;
last_io.minor = minor; = pid;
last_io.type = __file_type(inode, pid);
last_io.fio = *fio;
last_io.len = 1;
......@@ -14,6 +14,24 @@
#include <trace/events/f2fs.h>
enum file_type {
struct last_io_info {
int major, minor;
pid_t pid;
enum file_type type;
struct f2fs_io_info fio;
block_t len;
extern void f2fs_trace_pid(struct page *);
extern void f2fs_trace_ios(struct page *, struct f2fs_io_info *, int);
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