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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 <[email protected]>
Acked-by: Oleg Nesterov <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrea Righi 2008-07-27 17:29:15 +02:00 • committed by Linus Torvalds
commit 5995477ab7
7 changed files with 104 additions and 114 deletions
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30
kernel/exit.c
View file

@ -121,18 +121,7 @@ static void __exit_signal(struct task_struct *tsk)
sig->nivcsw += tsk->nivcsw;
sig->inblock += task_io_get_inblock(tsk);
sig->oublock += task_io_get_oublock(tsk);
#ifdef CONFIG_TASK_XACCT
sig->rchar += tsk->rchar;
sig->wchar += tsk->wchar;
sig->syscr += tsk->syscr;
sig->syscw += tsk->syscw;
#endif /* CONFIG_TASK_XACCT */
#ifdef CONFIG_TASK_IO_ACCOUNTING
sig->ioac.read_bytes += tsk->ioac.read_bytes;
sig->ioac.write_bytes += tsk->ioac.write_bytes;
sig->ioac.cancelled_write_bytes +=
tsk->ioac.cancelled_write_bytes;
#endif /* CONFIG_TASK_IO_ACCOUNTING */
task_io_accounting_add(&sig->ioac, &tsk->ioac);
sig->sum_sched_runtime += tsk->se.sum_exec_runtime;
sig = NULL; /* Marker for below. */
}
@ -1363,21 +1352,8 @@ static int wait_task_zombie(struct task_struct *p, int options,
psig->coublock +=
task_io_get_oublock(p) +
sig->oublock + sig->coublock;
#ifdef CONFIG_TASK_XACCT
psig->rchar += p->rchar + sig->rchar;
psig->wchar += p->wchar + sig->wchar;
psig->syscr += p->syscr + sig->syscr;
psig->syscw += p->syscw + sig->syscw;
#endif /* CONFIG_TASK_XACCT */
#ifdef CONFIG_TASK_IO_ACCOUNTING
psig->ioac.read_bytes +=
p->ioac.read_bytes + sig->ioac.read_bytes;
psig->ioac.write_bytes +=
p->ioac.write_bytes + sig->ioac.write_bytes;
psig->ioac.cancelled_write_bytes +=
p->ioac.cancelled_write_bytes +
sig->ioac.cancelled_write_bytes;
#endif /* CONFIG_TASK_IO_ACCOUNTING */
task_io_accounting_add(&psig->ioac, &p->ioac);
task_io_accounting_add(&psig->ioac, &sig->ioac);
spin_unlock_irq(&p->parent->sighand->siglock);
}