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task IO accounting: improve code readability

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Put all i/o statistics in struct proc_io_accounting and use inline functions to
initialize and increment statistics, removing a lot of single variable
assignments.

This also reduces the kernel size as following (with CONFIG_TASK_XACCT=y and
CONFIG_TASK_IO_ACCOUNTING=y).

    text    data     bss     dec     hex filename
   11651       0       0   11651    2d83 kernel/exit.o.before
   11619       0       0   11619    2d63 kernel/exit.o.after
   10886     132     136   11154    2b92 kernel/fork.o.before
   10758     132     136   11026    2b12 kernel/fork.o.after

 3082029  807968 4818600 8708597  84e1f5 vmlinux.o.before
 3081869  807968 4818600 8708437  84e155 vmlinux.o.after

Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
Acked-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Righi 2008-07-27 17:29:15 +02:00 • committed by Linus Torvalds
parent 605ccb73f6
commit 5995477ab7
7 changed files with 101 additions and 111 deletions
Download patch file Download diff file Expand all files Collapse all files

27
include/linux/task_io_accounting.h
View file

@ -1,5 +1,5 @@
/*
* task_io_accounting: a structure which is used for recording a single task's
* proc_io_accounting: a structure which is used for recording a single task's
* IO statistics.
*
* Don't include this header file directly - it is designed to be dragged in via
@ -8,6 +8,22 @@
* Blame akpm@osdl.org for all this.
*/
#ifdef CONFIG_TASK_XACCT
struct task_chr_io_accounting {
/* bytes read */
u64 rchar;
/* bytes written */
u64 wchar;
/* # of read syscalls */
u64 syscr;
/* # of write syscalls */
u64 syscw;
};
#else /* CONFIG_TASK_XACCT */
struct task_chr_io_accounting {
};
#endif /* CONFIG_TASK_XACCT */
#ifdef CONFIG_TASK_IO_ACCOUNTING
struct task_io_accounting {
/*
@ -31,7 +47,12 @@ struct task_io_accounting {
*/
u64 cancelled_write_bytes;
};
#else
#else /* CONFIG_TASK_IO_ACCOUNTING */
struct task_io_accounting {
};
#endif
#endif /* CONFIG_TASK_IO_ACCOUNTING */
struct proc_io_accounting {
struct task_chr_io_accounting chr;
struct task_io_accounting blk;
};