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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
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kernel/tsacct.c
+7 -7
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@@ -94,14 +94,14 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
stats->hiwater_vm = mm->hiwater_vm * PAGE_SIZE / KB;
mmput(mm);
}
stats->read_char = p->rchar;
stats->write_char = p->wchar;
stats->read_syscalls = p->syscr;
stats->write_syscalls = p->syscw;
stats->read_char = p->ioac.chr.rchar;
stats->write_char = p->ioac.chr.wchar;
stats->read_syscalls = p->ioac.chr.syscr;
stats->write_syscalls = p->ioac.chr.syscw;
#ifdef CONFIG_TASK_IO_ACCOUNTING
stats->read_bytes = p->ioac.read_bytes;
stats->write_bytes = p->ioac.write_bytes;
stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
stats->read_bytes = p->ioac.blk.read_bytes;
stats->write_bytes = p->ioac.blk.write_bytes;
stats->cancelled_write_bytes = p->ioac.blk.cancelled_write_bytes;
#else
stats->read_bytes = 0;
stats->write_bytes = 0;