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authorAlexey Dobriyan <adobriyan@gmail.com>2007-02-10 01:46:45 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 11:18:07 -0800
commit4b98d11b40f03382918796f3c5c936d5495d20a4 (patch)
tree616b7260196c9bd0eaf208ef8fab91fcf9efcece /kernel
parent18f705f49a5b19206233f7cef8f869ce7291f8c8 (diff)
[PATCH] ifdef ->rchar, ->wchar, ->syscr, ->syscw from task_struct
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index d57118da73ff..80284eb488ce 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -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);