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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 <jaegeuk@kernel.org>
parent 63f92ddc

fs/f2fs/trace.c

+86 −0
Original line number Diff line number Diff line
@@ -15,10 +15,96 @@ 
#include "f2fs.h"

#include "trace.h"



RADIX_TREE(pids, GFP_NOIO);

struct last_io_info last_io;



static inline void __print_last_io(void)

{

	if (!last_io.len)

		return;



	trace_printk("%3x:%3x %4x %-16s %2x %5x %12x %4x\n",

			last_io.major, last_io.minor,

			last_io.pid, "----------------",

			last_io.type,

			last_io.fio.rw, last_io.fio.blk_addr,

			last_io.len);

	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))

		return __VOLATILE_FILE;

	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;

	else

		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)

		return;

	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) {

		__print_last_io();

		return;

	}



	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 &&

			last_io.pid == pid &&

			last_io.type == __file_type(inode, pid) &&

			last_io.fio.rw == fio->rw &&

			last_io.fio.blk_addr + last_io.len == fio->blk_addr) {

		last_io.len++;

		return;

	}



	__print_last_io();



	last_io.major = major;

	last_io.minor = minor;

	last_io.pid = pid;

	last_io.type = __file_type(inode, pid);

	last_io.fio = *fio;

	last_io.len = 1;

	return;

}

fs/f2fs/trace.h

+18 −0
Original line number Diff line number Diff line
@@ -14,6 +14,24 @@ 
#ifdef CONFIG_F2FS_IO_TRACE

#include <trace/events/f2fs.h>



enum file_type {

	__NORMAL_FILE,

	__DIR_FILE,

	__NODE_FILE,

	__META_FILE,

	__ATOMIC_FILE,

	__VOLATILE_FILE,

	__MISC_FILE,

};



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);

#else