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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

56
include/linux/task_io_accounting_ops.h
View file

@ -9,7 +9,7 @@
#ifdef CONFIG_TASK_IO_ACCOUNTING
static inline void task_io_account_read(size_t bytes)
{
current->ioac.read_bytes += bytes;
current->ioac.blk.read_bytes += bytes;
}
/*
@ -18,12 +18,12 @@ static inline void task_io_account_read(size_t bytes)
*/
static inline unsigned long task_io_get_inblock(const struct task_struct *p)
{
return p->ioac.read_bytes >> 9;
return p->ioac.blk.read_bytes >> 9;
}
static inline void task_io_account_write(size_t bytes)
{
current->ioac.write_bytes += bytes;
current->ioac.blk.write_bytes += bytes;
}
/*
@ -32,17 +32,25 @@ static inline void task_io_account_write(size_t bytes)
*/
static inline unsigned long task_io_get_oublock(const struct task_struct *p)
{
return p->ioac.write_bytes >> 9;
return p->ioac.blk.write_bytes >> 9;
}
static inline void task_io_account_cancelled_write(size_t bytes)
{
current->ioac.cancelled_write_bytes += bytes;
current->ioac.blk.cancelled_write_bytes += bytes;
}
static inline void task_io_accounting_init(struct task_struct *tsk)
static inline void task_io_accounting_init(struct proc_io_accounting *ioac)
{
memset(&tsk->ioac, 0, sizeof(tsk->ioac));
memset(ioac, 0, sizeof(*ioac));
}
static inline void task_blk_io_accounting_add(struct proc_io_accounting *dst,
struct proc_io_accounting *src)
{
dst->blk.read_bytes += src->blk.read_bytes;
dst->blk.write_bytes += src->blk.write_bytes;
dst->blk.cancelled_write_bytes += src->blk.cancelled_write_bytes;
}
#else
@ -69,9 +77,37 @@ static inline void task_io_account_cancelled_write(size_t bytes)
{
}
static inline void task_io_accounting_init(struct task_struct *tsk)
static inline void task_io_accounting_init(struct proc_io_accounting *ioac)
{
}
#endif /* CONFIG_TASK_IO_ACCOUNTING */
#endif /* __TASK_IO_ACCOUNTING_OPS_INCLUDED */
static inline void task_blk_io_accounting_add(struct proc_io_accounting *dst,
struct proc_io_accounting *src)
{
}
#endif /* CONFIG_TASK_IO_ACCOUNTING */
#ifdef CONFIG_TASK_XACCT
static inline void task_chr_io_accounting_add(struct proc_io_accounting *dst,
struct proc_io_accounting *src)
{
dst->chr.rchar += src->chr.rchar;
dst->chr.wchar += src->chr.wchar;
dst->chr.syscr += src->chr.syscr;
dst->chr.syscw += src->chr.syscw;
}
#else
static inline void task_chr_io_accounting_add(struct proc_io_accounting *dst,
struct proc_io_accounting *src)
{
}
#endif /* CONFIG_TASK_XACCT */
static inline void task_io_accounting_add(struct proc_io_accounting *dst,
struct proc_io_accounting *src)
{
task_chr_io_accounting_add(dst, src);
task_blk_io_accounting_add(dst, src);
}
#endif /* __TASK_IO_ACCOUNTING_OPS_INCLUDED */