A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-30 11:41:38 -04:00
Code Issues Projects Releases Packages Wiki Activity

task IO accounting: improve code readability

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

51
fs/proc/base.c
View file

@ -53,6 +53,7 @@
#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/file.h>
@ -2402,44 +2403,17 @@ static int proc_base_fill_cache(struct file *filp, void *dirent,
#ifdef CONFIG_TASK_IO_ACCOUNTING
static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
{
u64 rchar, wchar, syscr, syscw;
struct task_io_accounting ioac;
struct proc_io_accounting acct = task->ioac;
unsigned long flags;
rchar = task->rchar;
wchar = task->wchar;
syscr = task->syscr;
syscw = task->syscw;
memcpy(&ioac, &task->ioac, sizeof(ioac));
if (whole && lock_task_sighand(task, &flags)) {
struct task_struct *t = task;
if (whole) {
unsigned long flags;
task_io_accounting_add(&acct, &task->signal->ioac);
while_each_thread(task, t)
task_io_accounting_add(&acct, &t->ioac);
if (lock_task_sighand(task, &flags)) {
struct signal_struct *sig = task->signal;
struct task_struct *t = task;
rchar += sig->rchar;
wchar += sig->wchar;
syscr += sig->syscr;
syscw += sig->syscw;
ioac.read_bytes += sig->ioac.read_bytes;
ioac.write_bytes += sig->ioac.write_bytes;
ioac.cancelled_write_bytes +=
sig->ioac.cancelled_write_bytes;
while_each_thread(task, t) {
rchar += t->rchar;
wchar += t->wchar;
syscr += t->syscr;
syscw += t->syscw;
ioac.read_bytes += t->ioac.read_bytes;
ioac.write_bytes += t->ioac.write_bytes;
ioac.cancelled_write_bytes +=
t->ioac.cancelled_write_bytes;
}
unlock_task_sighand(task, &flags);
}
unlock_task_sighand(task, &flags);
}
return sprintf(buffer,
"rchar: %llu\n"
@ -2449,9 +2423,10 @@ static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
"read_bytes: %llu\n"
"write_bytes: %llu\n"
"cancelled_write_bytes: %llu\n",
rchar, wchar, syscr, syscw,
ioac.read_bytes, ioac.write_bytes,
ioac.cancelled_write_bytes);
acct.chr.rchar, acct.chr.wchar,
acct.chr.syscr, acct.chr.syscw,
acct.blk.read_bytes, acct.blk.write_bytes,
acct.blk.cancelled_write_bytes);
}
static int proc_tid_io_accounting(struct task_struct *task, char *buffer)