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0e689d0369
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: Jaegeuk Kim <jaegeuk@kernel.org>
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/*
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* f2fs IO tracer
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*
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* Copyright (c) 2014 Motorola Mobility
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* Copyright (c) 2014 Jaegeuk Kim <jaegeuk@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include <linux/sched.h>
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#include "f2fs.h"
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#include "trace.h"
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RADIX_TREE(pids, GFP_NOIO);
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struct last_io_info last_io;
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static inline void __print_last_io(void)
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{
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if (!last_io.len)
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return;
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trace_printk("%3x:%3x %4x %-16s %2x %5x %12x %4x\n",
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last_io.major, last_io.minor,
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last_io.pid, "----------------",
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last_io.type,
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last_io.fio.rw, last_io.fio.blk_addr,
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last_io.len);
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memset(&last_io, 0, sizeof(last_io));
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}
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static int __file_type(struct inode *inode, pid_t pid)
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{
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if (f2fs_is_atomic_file(inode))
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return __ATOMIC_FILE;
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else if (f2fs_is_volatile_file(inode))
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return __VOLATILE_FILE;
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else if (S_ISDIR(inode->i_mode))
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return __DIR_FILE;
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else if (inode->i_ino == F2FS_NODE_INO(F2FS_I_SB(inode)))
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return __NODE_FILE;
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else if (inode->i_ino == F2FS_META_INO(F2FS_I_SB(inode)))
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return __META_FILE;
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else if (pid)
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return __NORMAL_FILE;
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else
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return __MISC_FILE;
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}
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void f2fs_trace_pid(struct page *page)
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{
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struct inode *inode = page->mapping->host;
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pid_t pid = task_pid_nr(current);
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void *p;
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page->private = pid;
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p = radix_tree_lookup(&pids, pid);
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if (p == current)
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return;
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if (p)
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radix_tree_delete(&pids, pid);
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f2fs_radix_tree_insert(&pids, pid, current);
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trace_printk("%3x:%3x %4x %-16s\n",
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MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev),
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pid, current->comm);
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}
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void f2fs_trace_ios(struct page *page, struct f2fs_io_info *fio, int flush)
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{
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struct inode *inode;
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pid_t pid;
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int major, minor;
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if (flush) {
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__print_last_io();
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return;
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}
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inode = page->mapping->host;
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pid = page_private(page);
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major = MAJOR(inode->i_sb->s_dev);
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minor = MINOR(inode->i_sb->s_dev);
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if (last_io.major == major && last_io.minor == minor &&
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last_io.pid == pid &&
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last_io.type == __file_type(inode, pid) &&
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last_io.fio.rw == fio->rw &&
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last_io.fio.blk_addr + last_io.len == fio->blk_addr) {
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last_io.len++;
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return;
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}
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__print_last_io();
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last_io.major = major;
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last_io.minor = minor;
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last_io.pid = pid;
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last_io.type = __file_type(inode, pid);
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last_io.fio = *fio;
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last_io.len = 1;
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return;
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}
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