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[PATCH] ifdef ->rchar, ->wchar, ->syscr, ->syscw from task_struct

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They are fat: 4x8 bytes in task_struct.
They are uncoditionally updated in every fork, read, write and sendfile.
They are used only if you have some "extended acct fields feature".

And please, please, please, read(2) knows about bytes, not characters,
why it is called "rchar"?

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2007-02-10 01:46:45 -08:00 • committed by Linus Torvalds
parent 18f705f49a
commit 4b98d11b40
4 changed files with 58 additions and 12 deletions
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2
kernel/fork.c
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@ -1038,10 +1038,12 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->utime = cputime_zero;
p->stime = cputime_zero;
p->sched_time = 0;
#ifdef CONFIG_TASK_XACCT
p->rchar = 0; /* I/O counter: bytes read */
p->wchar = 0; /* I/O counter: bytes written */
p->syscr = 0; /* I/O counter: read syscalls */
p->syscw = 0; /* I/O counter: write syscalls */
#endif
task_io_accounting_init(p);
acct_clear_integrals(p);